ff-s-85d-screws

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FF- S- 85D10 MARCH 2005SUPERSEDI NGFF- S- 85CMay 6, 1969

FEDERAL SPECI FI CATI ON

SCREW, CAP, SLOTTED AND HEXAGON HEAD

The Gener al Servi ces Admi ni st r at i on has author i zed t he useof t hi s f eder al speci f i cat i on by al l Feder al agenci es.

1. SCOPE AND CLASSI FI CATI ON

1. 1 Scope. Thi s speci f i cat i on cover s t he t ypes and st yl es of sl ot t edand hexagon head cap scr ews, cl assi f i ed i n 1. 2. 1 ( see 6. 1) .

1. 2 Cl assi f i cat i on.

1. 2. 1 Types and st yl es. Cap scr ews shal l be of t he f ol l owi ng t ypes andstyl es(see 6. 2) .

Type I - Sl ot t ed head.St yl e 1s - Round head ( see f i g. 5)St yl e 2s - Fl at count er sunk head, 82º ( see f i g. 5) .St yl e 4s - Fi l l i s ter head ( see f i g. 5) .

Type I I - Pl ai n head.St yl e 10p - Hexagon head ( see f i g. 5) .

1. 2. 2 Gr ades. Cap scr ews of st eel mat er i al shal l be of t he f ol l owi nggr ades( see 6. 2) .

Gr ade 2 - Low carbon st eel .Gr ade 5 - Medi um car bon st eel .Gr ade 8 - Al l oy st eel .Gr ade 9 - Opt i onal al l oy st eel .

1. 2. 3 Si zes. The si zes of cap scr ews shal l be cl assi f i ed by t he nomi nalbody di amet er f r om1/ 4 i nch t hr u 3 i nches as speci f i ed ( see 6. 2) .

2. APPLI CABLE DOCUMENTS

2. 1 Gover nment Publ i cat i ons. The f ol l owi ng document s of t he i ssues i n ef f ecton dat e of i nvi t at i on f or bi ds, or r equest f or pr oposal , f or m a par t of t hi sspeci f i cat i on t o the ext ent speci f i ed her ei n.

Comment s, suggest i ons, or quest i ons on t hi s document shoul d be addressed t o: Def enseSuppl y Cent er Phi l adel phi a, ATTN: DSCP- I TAA, 700 Robbi ns Avenue, Phi l adel phi a, PA19111- 5096 or emai l ed t o dscpg&i speccomment s@dl a. mi l . Si nce cont act i nf or mat i on canchange, you may want t o ver i f y t he cur r ency of t hi s addr ess i nf ormat i on usi ng t he ASSI STOnl i ne database at ht t p: / / assi st. daps. dl a. mi l .

ASMC N/ A FSC 5305

I NCH- POUND



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Feder al Speci f i cat i ons:

QQ- N- 281 - Ni ckel - Copper Al l oy Bar , Pl at e, Rod, Sheet , St r i p, Wi r e,For gi ngs and St r uct ur al and Speci al Shaped Sect i ons.

QQ- N- 286 - Ni ckel - Copper - Al umi num Al l oy, Wr ought .

Feder al St andar ds:

FED- STD- H28/ 2 - Scr ew- t hr ead st andards f or Federal Ser vi ces Sect i on 2Uni f i ed I nch Scr ew Thr eads - UN and UNR Thread Forms.

( Act i vi t i es out si de the Feder al Gover nment may obt ai n copi es of FederalSpeci f i cat i ons, St andards, and Handbooks as speci f i ed i n t he GeneralI nf or mat i on sect i on of t he I ndex of Feder al Speci f i cat i ons and St andar ds.

The I ndex i s f or sal e on a subscr i pt i on basi s f r om t he Super i nt endent ofDocument s, U. S. Government Pr i nt i ng Of f i ce, Washi ngton, D. C. 20402. )

( Si ngl e copi es of t hi s speci f i cat i on and ot her Feder al Speci f i cat i onsr equi r ed by act i vi t i es out si de t he Feder al Gover nment f or bi ddi ng pur posesar e avai l abl e wi t hout char ge f r om t he Gener al Ser vi ces Admi ni st r at i on,

Feder al Suppl y Ser vi ce, Speci f i cat i on Sect i on, Sui t e 8100, 470 L’ Enf antPl aza, SW, Washi ngt on, DC 20407. )

( Feder al Gover nment act i vi t i es may obt ai n copi es of Feder al Speci f i cat i ons,St andards, and Handbooks and the I ndex of Federal Speci f i cat i ons and St andardsf r om est abl i shed di st r i but i on poi nt s i n t hei r agenci es. )

Mi l i t ary Speci f i cat i ons:

MI L- F- 495 - Fi ni sh, Chemi cal , Bl ack, f or Copper Al l oys.MI L- A- 8625 - Anodi c Coat i ngs f or Al umi num and Al umi num Al l oys.MI L- DTL- 16232 - Phosphat e Coat i ngs, Heavy, Manganese or Zi nc Base

( f or Fer r ous Met al s) .MI L- DTL- 18240 - Fast ener El ement , Sel f - Locki ng, Thr eaded Fast ener ,

250°F Maxi mum

Mi l i t ar y St andar ds:

MS35295 - Scr ew, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , Medi um Car bon St eel , Pl ai n Fi ni sh, UNC- 2A

MS35302 - Screw, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , Al l oySt eel , Pl ai n Fi ni sh, UNF- 2A

MS35309 - Scr ew, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , NavalBr ass, Pl ai n Fi ni sh, UNC- 2A

MS35310 - Scr ew, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , NavalBr ass, Pl ai n Fi ni sh, UNF- 2A

MS35311 - Scr ew, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) ,Ni ckel - Copper Al l oy, Pl ai n Fi ni sh, UNC- 2A

MS35312 - Scr ew, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) ,Ni ckel - Copper Al l oy, Pl ai n Fi ni sh, UNF- 2A

MS51099 - Scr ew, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , HeadDr i l l ed f or Locki ng Wi r e, St eel , Cor r osi on Resi st i ng,Passi vat ed, UNC- 2A



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MS51100 - Scr ew, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , HeadDr i l l ed f or Locki ng Wi r e, St eel , Cor r osi on Resi st i ng,Passi vat ed, UNF- 2A

MS51107 - Scr ew, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , ShankDr i l l ed f or Cot t er Pi n, Al l oy St eel , Gr ade 8, Phosphat eCoat ed, UNC- 2A

MS51108 - Scr ew, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , Shank

Dr i l l ed f or Cot t er Pi n, Al l oy St eel , Gr ade 8, Phosphat eCoated, UNF- 2A

( Copi es of Mi l i t ar y Speci f i cat i ons and St andar ds requi r ed by cont r act or s i nconnect i on wi t h speci f i c pr ocur ement f unct i ons are obt ai ned f r om t heStandar di zat i on Document s Or der Desk, Bui l di ng 4D, 700 Robbi ns Avenue,Phi l adel phi a, PA 19111- 5094. )

2. 2 Ot her publ i cat i ons. The f ol l owi ng document s f orm a par t of t hi sspeci f i cat i on t o the ext ent speci f i ed her ei n. Unl ess a speci f i c i ssue i si dent i f i ed, t he i ssue i n ef f ect on t he dat e of i nvi t at i on f or bi ds or r equest f orpr oposal shal l appl y.

Amer i can Soci ety of Mechani cal Engi neers ( ASME)

ASME B18. 2. 1 - Squar e and Hex Bol t s and Screws ( I nch Ser i es)

ASME B18. 6. 2 - Sl ot t ed Head Cap Screws, Squar e Head Set Screws,and Sl ot t ed Headl ess Set Scr ews ( I nch Seri es)

ASME B46. 1 - Sur f ace Text ure ( Sur f ace Roughness, Wavi ness and Lay)

( Appl i cat i on f or copi es shoul d be addr essed t o the Amer i can Soci et y ofMechani cal Engi neers ( ASME) , Or der Depart ment : 22 Law Dr i ve, P. O. Box 2900,Fai r f i el d, NJ 07007- 2900. )

Soci ety of Automot i ve Engi neers ( SAE)

SAE- AMS- STD- 66 - St eel : Chemi cal Composi t i on and Hardenabi l i t ySAE- AMS- QQ- A- 225/ 6 – Al umi num Al l oy, 2024, Bar , Rod, and Wi r e; Rol l ed,

Dr awn, or Col d Fi ni shed- UNS A92024SAE- AMS- QQ- A- 225/ 8 – Al umi num Al l oy, 6061, Bar , Rod, and Wi r e, and Speci al

Shapes; Rol l ed, Dr awn, or Col d Fi ni shed- UNS A96061SAE- AMS- QQ- P- 35 - Passi vat i on Treat ment s f or Corr osi on- Resi st ant St eelSAE- AMS- QQ- P- 416 - Pl at i ng, Cadmi um ( El ect r odeposi t ed)SAE J 429 - Mechani cal and Mater i al Requi r ement s f or Ext ernal l y

Threaded Fast ener s

( Appl i cat i on f or copi es shoul d be addr essed to t he SAE I nt er nat i onal , 400Commonweal t h Dr i ve , Warr endal e, PA 15096- 0001. )

Ameri can Soci et y f or Test i ng and Mat eri al s ( ASTM)

ASTM A342 - St andard Test Methods f or Per meabi l i t y of Feebl y Magnet i c

Mat er i al sASTM B21 - St andard Speci f i cat i on f or Naval Brass Rod, Bar , and ShapesASTM B98 - Standar d Speci f i cat i on f or Copper - Si l i con Al l oy Rod, Bar , and

ShapesASTM B124 - St andar d Speci f i cat i on f or Copper and Copper Al l oy For gi ng

Rod, Bar s and ShapesASTM B138 - St andard Speci f i cat i on f or Manganese Br onze Rod, Bar , and

Shapes



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ASTM B139 - St andard Speci f i cat i on f or Phosphor Br onze Rod, Bar , andShapes

ASTM B150 - St andar d Speci f i cat i on f or Al umi num Br onze Rod, Bar , andShapes

ASTM B154 - St andard Test Method f or Mercur ous Ni t r ate Test f or Copper andCopper Al l oys

ASTM B633 - St andar d Speci f i cat i on f or El ect r odeposi t ed Coat i ngs of Zi nc

on I r on and St eelASTM D3951 – Standar d Pr act i ce Commerci al Packi ngASTM E10 - Standar d Test Met hod f or Br i nel l Har dness of Met al l i c

Mat er i al s - AASHTO NO. T70- 86ASTM E18 - St andar d Test Met hods f or Rockwel l Hardness and Rockwel l

Super f i ci al Har dness of Met al l i c Mat er i al sASTM E1282 – St andar d Gui de f or Speci f yi ng t he Chemi cal Composi t i ons and

Sel ect i ng Sampl i ng Pr act i ces and Quant i t at i ve Anal ysi s Met hodsf or Met al s, Or es, and Rel at ed Mat er i al s

ASTM E1417 – Standar d Pr act i ce f or Li qui d Penet r ant Exami nat i onASTM E1444 - St andar d Pract i ce f or Magnet i c Par t i cl e Exami nat i onASTM F468 – St andar d Speci f i cat i on f or Nonf err ous Bol t s, Hex Cap Scr ews,

and St uds f or General UseASTM F606 - St andard Test Methods f or Determi ni ng t he Mechani cal Propert i es

of Exter nal l y and I nt ernal l y Thr eaded Fast ener s, Washer s andRi vet s

( Appl i cat i on f or copi es shoul d be addr essed to t he ASTM, 100 Barr Harbor Dr i ve,West Conshohocken, PA 19428- 2959. )

Amer i can Soci et y f or Qual i t y Cont r ol ( ASQ)

ASQ Z1. 4 – Sampl i ng Procedur es and Tabl es f or I nspect i on by At t r i but es

( Appl i cat i on f or copi es shoul d be addr essed t o t he Amer i can Soci et y f or Qual i t yCont r ol , 611 East Wi sconsi n Avenue, Mi l waukee, WI 53202. )

Nat i onal Aerospace St andar ds Commi t t ee ( NASC)

NASM 1312- 6 - Fast ener Test Met hods - Met hod 6, HardnessNASM35307 - Scr ew, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , Steel

Corr osi on Resi st i ng, Passi vat ed, UNC- 2ANASM35308 - Scr ew, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , Steel

Cor r osi on Resi st i ng, Passi vat ed, UNF- 2ANASM51095 - Screw, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , Head Dr i l l ed

f or Locki ng Wi r e, St eel , Gr ade 5, Cadmi um Pl ated, UNC- 2A, Pl ai nand Sel f - l ocki ng

NASM51096 - Scr ew, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , Head Dr i l l edf or Locki ng Wi r e, St eel , Gr ade 5, Cadmi um Pl ated, UNF- 2A, Pl ai nand Sel f - l ocki ng

NASM51105 - Screw, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , Shank Dr i l l edf or Cot t er Pi n, St eel , Gr ade 5, Cadmi um Pl at ed, UNC- 2A

NASM51106 - Screw, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , Shank Dr i l l ed

f or Cot t er Pi n, St eel , Gr ade 5, Cadmi um Pl at ed, UNF- 2ANASM51109 - Scr ew, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , Shank

Dr i l l ed f or Cot t er Pi n, St eel , Corr osi on Resi st i ng,Passi vated, UNC- 2A



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NASM51110 - Scr ew, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , ShankDr i l l ed f or Cot t er Pi n, St eel , Cor r osi on Resi st i ngPassi vat ed, UNF- 2A

NASM90725 - Screw, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , Steel ,Gr ade 5, Cadmi um Pl at ed, UNC- 2A

NASM90726 - Screw, Cap, Hexagon Head ( Fi ni shed Hexagon Bol t ) , Steel ,Gr ade 5, Cadmi umPl at ed, UNF- 2A

( Appl i cat i on f or copi es of NASC publ i cat i ons shoul d be addr essed t o theAerospace I ndust r i es Associ at i on, 1250 Eye St r eet , NW, Washi ngt on, DC 20005. )

3. REQUI REMENTS

3. 1 Mat er i al . Unl ess ot her wi se speci f i ed i n t he i nvi t at i on f or bi ds, cont r actor order, cap scr ews shal l be made of mat er i al s speci f i ed i n 3. 1. 1 t hr ough 3. 1. 5and Tabl e I A ( see 6. 2) .

3. 1. 1 Low car bon st eel . Unl ess ot her wi se speci f i ed ( see 6. 2) grade 2 capscr ews shal l be made of l ow carbon st eel as shown i n Tabl e I . The chemi calcomposi t i on shal l cont ai n a maxi mum of 0. 28 percent carbon, a maxi mum of 0. 04percent phosphorus, and a maxi mum of 0. 05 percent sul f ur.

3. 1. 2 Medi umcarbon st eel . Gr ade 5 cap scr ews shal l be made of medi umcarbonst eel as shown i n Tabl e I and conf ormi ng t o t he r equi r ement s of SAE- AMS- STD- 66.

The chemi cal composi t i on shal l cont ai n 0. 28 t o 0. 55 percent car bon, a maxi mum of0. 04 percent phosphorus and a maxi mum of 0. 05 per cent sul f ur . I t shal l be

quenched and t empered at a mi ni mum t emperat ure of 800°F. Cap scr ews of t hef ol l owi ng st andar ds shal l be made i n accor dance wi t h t he speci f i cat i on: MS35295,NASM51095, NASM51096, NASM51105, NASM51106, NASM90725, and NASM90726.

3. 1. 3 Al l oy steel s.

3. 1. 3. 1 Al l oy st eel , Gr ade 8. Gr ade 8 cap scr ews shal l be made of al l oy st eelas shown i n Tabl e I and conf ormi ng t o t he r equi r ement s of SAE- AMS- STD- 66. Thechemi cal composi t i on shal l cont ai n 0. 28 t o 0. 55 percent carbon, a maxi mum of 0. 04

percent phosphorus, and a maxi mum of 0. 05 percent sul f ur. I t shal l be hardenedsuf f i ci ent l y to a mi ni mum oi l - quench Rockwel l har dness of C45 at t he cent er of t het hreaded sect i on, one di ameter f r om t he end of t he cap scr ew. Cap scr ews of t hef ol l owi ng st andar ds shal l be made i n accor dance wi t h t he speci f i cat i on: MS35302,MS51107, and MS51108.

TABLE I . Gr ades and Mechani cal Pr oper t i es of St eel CapScrews 1/ 4 t hru 3 I nch Di amet ers

Har dness

Gr adeDesi gnati on

Nomi nal Si zeDi a. , I nch

Proof Loadp. s . i .

Tensi l eStr engthp. s . i . ( Mi n

Br i nel l No. Rockwel l

Mi n Max Mi n Max2 1/ 4 t hru 3/ 4 * 55, 000 74, 000 149 241 B80 B100

Over 3/ 4 t hru 1- 1/ 2** 33, 000 60, 000 121 241 B70 B1001/ 4 t hru 1 85, 000 120, 000 255 321 C25 C34

5 Over 1 t hru 1- 1/ 2 74, 000 105, 000 223 285 C19 C30Over 1- 1/ 2 t hru 3 55, 000 90, 000 183 235 B90 C21. 7

8 1/ 4 t hru 1- 1/ 2 120, 000 150, 000 302 352 C33 C39Over 1- 1/ 2 t hru 3 85, 000 120, 000 302 352 C33 C39

9( Opt i on Al l oy)

1/ 4 t hru 1- 1/ 2 130, 000 170, 000 336 386 C36 C45

* 6" and l ess i n l engt h.** Al l di amet er s i f l engt h exceeds 6".



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3. 1. 3. 2 Opt i onal al l oy st eel . The opt i onal al l oy st eel shown i n Tabl e I shal lhave the same chemi cal composi t i on as grade 8 conf ormi ng t o t he r equi r ement s ofSAE- AMS- STD- 66 except t hat i t shal l be hardened suf f i ci ent l y to a mi ni mum oi lquench Rockwel l har dness of C50 at t he cent er of t he t hreaded sect i on, onedi amet er f r omt he end of t he cap screw.

3. 1. 3. 3 Al l oy st eel s. Al l oy st eel s shal l be oi l - quenched and t emper ed at a

mi ni mum t emper at ure of 800°F.

3. 1. 4 Cor r osi on r esi st i ng st eel s.

3. 1. 4. 1 Aust eni t i c. Aust eni t i c cor r osi on r esi st i ng st eel scr ews shal l bemanuf act ur ed f r om300 ser i es cor r osi on st eel as speci f i ed i n SAE- AMS- STD- 66 andmeet t he mechani cal pr opert i es speci f i ed i n 3. 2. 2. 1. Cap scr ews of NASM35307 andNASM35308 shal l be made i n accordance wi t h t he speci f i cat i on.

3. 1. 4. 2 Fer r i t i c and mar t ensi t i c. Fer r i t i c and mar t ensi t i c cor r osi on r esi st i ngst eel cap scr ews shal l be manuf act ur ed f r oma steel composi t i on such as st eelnumber s 410, 416, and 430 as speci f i ed i n SAE- AMS- STD- 66 and meet s t he mechani calpropert i es speci f i ed i n 3. 2. 2. 2. Cap scr ews of NASM51099, NASM51100, NASM51109,and NASM51110 shal l be made i n accordance wi t h t he speci f i cat i on.

3. 1. 5 Non- f er r ous mat er i al . Non- f er r ous cap scr ews shal l be manuf act ur ed f r omal l oys speci f i ed i n Tabl e I A ( see 6. 2) . Cap scr ews of MS35309, MS35310,MS35311, and MS35312 shal l be made i n accordance wi t h t he speci f i cat i on.

3. 1. 5. 1 St r ess r el i ef . Col d wor ked naval br ass scr ews shal l be st r ess r el i evedby heat i ng the scr ews t o a t emper ature of 600ºF, and hol di ng at t hat t emperatur ef or a mi ni mumof one hour .

3. 1. 6 Sel f - l ocki ng el ement . Non- met al l i c, sel f - l ocki ng el ement s shal l be i naccordance wi t h MI L- DTL- 18240.

3. 2 Mechani cal pr oper t i es.

3. 2. 1 St eel . Gr ades and mechani cal pr oper t i es of l ow car bon, medi um car bon,al l oy st eel , and opt i onal al l oy st eel cap screws shal l conf or m t o Tabl e I , asappl i cabl e (see 6. 2) .

3. 2. 2 Cor r osi on r esi st i ng st eel .

3. 2. 2. 1 Aust eni t i c. Unl ess ot her wi se speci f i ed i n t he i nvi t at i on f or bi ds,cont r act or order , mechani cal pr oper t i es of aust eni t i c cor r osi on- r esi st i ng st eelcap scr ews shal l conf orm t o the f ol l owi ng f or di amet er s t hr ough 5/ 8 i nch:

a. Ul t i mat e t ensi l e st r engt h 80, 000 p. s. i . mi n.b. Yi el d st r engt h ( 0. 2 per cent of f set ) 30, 000 p. s. i . mi n.c. Rockwel l Hardness B80 mi n.d. El ongat i on 30 per cent mi n.e. Reduct i on i n area 40 per cent mi n.

For di amet er s over 5/ 8 i nch, ul t i mat e tensi l e str engt h shal l be 70, 000 p. s. i . mi n.and have a hardness of Rockwel l B74 mi n.



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3. 2. 2. 2 Fer r i t i c and mar t ensi t i c. Unl ess ot her wi se speci f i ed i n t he i nvi t at i onf or bi ds, cont r act or order , mechani cal pr oper t i es of f er r i t i c and mar t ensi t i c

cor r osi on- r esi st i ng st eel cap screws shal l conf or m t o the f ol l owi ng:

a. Ul t i mat e t ensi l e st r engt h 70, 000 p. s. i . mi n.b. Yi el d st r engt h ( 0. 2% of f set ) 40, 000 p. s. i . mi n.c. Br i nel l hardness B235 max

d. El ongat i on 15e. Reduct i on i n area 45

3. 2. 3 Non- f er r ous cap scr ews. Unl ess ot her wi se speci f i ed i n t he i nvi t at i onf or bi ds, cont r act or or der , mechani cal pr oper t i es of non- f er r ous cap screwsshal l conf or m t o Tabl e I A, as speci f i ed ( see 6. 2) .

TABLE I A. Mechani cal Pr opert i es of Scr ews of t he Non- Fer r ous Mat er i al s.

Mat eri alAppl i cabl especi f i ca-t i ons

UNS No.or

Cl ass

Temper codeor

Condi t i on

Tensi l est r engt hp. s . i .mi ni mum

Yi el d st r ength at 0. 2percent of f set or atext ensi on i ndi cated

El ongati onmi ni mum

mi ni mump. s . i

ext ensi onunderl oad

Manganesebronze

ASTM B138 C67500 O60 55, 000 22, 000 0. 5per cent

20

Al umi numbronze

ASTM B150 C63200 TQ55O20O25

90, 000 37, 000 0. 5per cent

18

Phosphorbronze

ASTM B139 C51000 H04 60, 000 33, 000 - - 15

Si l i conbronze

ASTM F468 C65100 - 60, 000 40, 000 0. 5per cent

10

Naval brass ASTM B21C46200

orC46400

H04orO50

60, 000 27, 000 0. 5per cent

25 2/

Al umi numal l oy 2024

SAE- AMS-QQ- A- 225/ 6 -

Sol ut i onheat - t r eated

t emper T4

62, 000 40, 000 0. 0058i nch peri nch

10 3/

Al umi num

al l oy 6061

SAE- AMS-

QQ- A- 225/ 8 -

Age har dened

t emper T6

42, 000 35, 000 0. 0055

i nch peri nch

10 3/

Ni ckel -copper al l oy

QQ- N- 281 Cl ass A 80, 000 40, 000 0. 0071i nch i n2 i nches

20 1/

Ni ckel -copper -al umi numal l oy

QQ- N- 286 Cl ass A Form 1 130, 000 90, 000 0. 0109i nch i n2 i nches

20 1/

1/ I n 2 i nches ( mi n)2/ I n 4 t i mes di amet er or t hi ckness (mi n)3/ I n 2 i nches or 4 t i mes di amet er ( mi n)

3. 3 Di mensi ons and t ol erances. Cap scr ews shal l conf orm t o t he di mensi ons and

t ol er ances of ASME B18. 2. 1 and B18. 6. 2 except as speci f i ed her ei n.

3. 3. 1 Lengt hs. Unl ess ot her wi se speci f i ed ( see 6. 2) , cap scr ews shal l bef ur ni shed i n t he f ol l owi ng l engt h i ncrement s:

Lengt hs up t o 1/ 2 i nch i ncl - 1/ 16 i nch i ncrement s.over 1/ 2 t o 1 i nches i ncl - 1/ 8 i nch i ncrement s.over 1 t o 5 i nches i ncl - 1/ 4 i nch i ncr ement s.over 5 i nches - 1/ 2 i nch i ncr ement s.



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3. 3. 2 Thr ead ser i es, cl ass, l engt hs, and hand. Unl ess ot her wi se speci f i ed ( see6. 2) , cap scr ews shal l be ri ght - hand of t he UNC ( coar se thr ead) or UNF ( f i net hr ead) seri es, Cl ass 2A, i n accor dance wi t h FED- STD- H28/ 2.

3. 3. 3 Thr eads pr ot ect i vel y coat ed. Unl ess ot her wi se speci f i ed ( see 6. 2) ,t hr eads protect i vel y coat ed shal l meet t he di mensi ons of FED- STD- H28/ 2 af t er t hecoat i ng has been appl i ed.

3. 3. 4 Beari ng sur f ace. Beari ng sur f ace of cap scr ew heads, except f l at head,shal l be at r i ght angl es t o the axi s of t he body wi t hi n a t ol er ance of 2 degr eesand of hex head wi t hi n a t ol erance of 2 degr ees f or 1 i nch si ze and smal l er , and 1degr ee f or si zes l ar ger t han 1 i nch. The axi s of t he head shal l be concent r i cwi t h t he axi s of t he body ( det ermi ned by one di amet er l ength of body under head)wi t hi n a t ol er ance equal t o 3 per cent ( 6 per cent TI R) of maxi mum wi dt h acr ossf l at s. Any mut i l at i on of t he bear i ng sur f ace suf f i ci ent t o pr event pr oper seat i ngof t he screw shal l be cause f or r ej ect i on.

3. 4 Pr ot ect i ve coat i ngs.

3. 4. 1 Coat i ngs. Cap scr ews shal l be f ur ni shed uncoated, passi vat ed, or coat edas speci f i ed her ei n ( see 6. 2) .

3. 4. 2 Passi vat i on. Cor r osi on r esi st ant st eel cap screws shal l be passi vat ed i naccor dance wi t h SAE- AMS- QQ- P- 35.

3. 4. 3 Cadmi um pl at i ng. When speci f i ed ( see 6. 2) , cap scr ews shal l be cadmi umpl at ed i n accor dance wi t h SAE- AMS- QQ- P- 416, Type I I , Cl ass 2.

3. 4. 4 Zi nc pl at i ng. When speci f i ed ( see 6. 2) , cap scr ews shal l be zi nc pl at edas speci f i ed i n ASTM B633, t ype I I , cl ass FE/ ZN 5.

3. 4. 5 Anodi zi ng. Unl ess ot her wi se speci f i ed, al umi num al l oy cap scr ews shal lbe el ect r ol yti cal l y tr eat ed i n conf or mance t o MI L- A- 8625, t ype I I , cl ass 1, non-dyed (see 6. 2) .

3. 4. 6 Phosphat e. When speci f i ed ( see 6. 2) , cap scr ews shal l be t r eat ed i nconf ormance to MI L- DTL- 16232, t ype Z, cl ass 2.

3. 4. 7 Bl ack chemi cal . When speci f i ed ( see 6. 2) , br ass cap scr ews shal l bet r eat ed wi t h a bl ack chemi cal f i ni sh i n accor dance wi t h MI L- F- 495.

3. 4. 8 Hydr ogen embr i t t l ement . Al l oy st eel cap scr ews requi r ed t o beel ect r opl at ed or phosphat e coat ed ( see 3. 4. 3 t hr u 3. 4. 6) shal l be subj ect ed to ar el i ef t r eat ment i n accor dance wi t h the met hods speci f i ed i n the appl i cabl epl at i ng or coat i ng speci f i cat i on, i mmedi at el y af t er t he pl at i ng or coat i ngoper at i on t o mi ni mi ze the embr i t t l ement t hat r esul t s f r om t hese pr ocesses.

3. 5 Met al l ogr aphi c r equi r ement s.

3. 5. 1 Decar bur i zat i on. When speci f i ed ( see 6. 2) , t he par t i al decar bur i zat i on

of t hr eads of st eel cap scr ews, t hen t est ed i n accor dance wi t h 4. 4. 4. 1, shal l notexceed t he amount shown i n f i gur e 1.

3. 5. 2 Gr ai n si ze of copper al l oy. When speci f i ed ( see 6. 2) , gr ai n si ze ofcopper al l oy i n cap scr ews shal l be an opt i on of t he cont r act i ng of f i cer i naccor dance wi t h t he mat er i al speci f i cat i on.



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3. 6 Sur f ace r oughness. Unl ess ot her wi se speci f i ed ( see 6. 2) , cap screws shal lhave a maxi mum ari t hmet i cal average sur f ace r oughness on t he bear i ng sur f ace oft he head and shank of 125 mi cr oi nches. Hot headed cap scr ews over 3/ 4 i nch i n

di amet er are except ed and shal l have a maxi mumsur f ace roughness of 250mi cr oi nches. Thr eads shal l have a maxi mum sur f ace r oughness of 63 mi cr oi nches.Nor mal l y, i t wi l l be suf f i ci ent t o ascer t ai n t hat t hese sur f aces on screws have

t he equi val ent of a smoot h machi ned f i ni sh by vi sual compari son wi t h known sur f ace

st andar ds. However, t hen i t i s deemed necessar y t o measure t hese sur f aces wi t hcommerci al l y avai l abl e equi pment , r oughness measurement s shal l be t aken axi al l y on

t he body and f i l l et sur f aces, and ci r cumf er ent i al l y on t he bear i ng sur f ace i naccor dance wi t h ASME B46. 1.

3. 7 Method of manuf actur e. Unl ess t he method of manuf actur e i s speci f i cal l yst ated ( see 6. 2) , t he method empl oyed f or t he pr oduct i on of scr ew t hr eads on capscr ews shal l be at t he opt i on of t he manuf act ur er .

3. 8 Head marki ngs. Steel cap scr ews shal l be per manent l y marked wi t h t he gradei dent i f i cat i on symbol conf ormi ng t o SAE J 429, and appl i cabl e document s. I naddi t i on, al l cap screws shal l be mar ked wi t h t he manuf act ur er ’ s i dent i f i cat i onsymbol . Marki ngs shal l be l ocat ed on t he t op of t he head, and may be ei t herr ai sed or depr essed, at t he opt i on of t he manuf act ur er .

3. 9 Def ect s.

3. 9. 1 Di scont i nui t i es. Cap screws shal l not cont ai n di scont i nui t i es whi chequal or exceed t he f ol l owi ng l i mi t at i ons. Car e must be exer ci sed not t o conf usecr acks wi t h di scont i nui t i es, as descr i bed her ei n. When vi sual i nspect i ondi scl oses di scont i nui t i es whi ch show cause f or f ur t her exami nat i on, magnet i cpar t i cl e or penet r ant i nspect i on as appl i cabl e, shal l be as speci f i ed i n 4. 4. 9.

3. 9. 1. 1 Laps and seams. Cap scr ews may possess l aps and seams except i nl ocat i ons speci f i ed i n 3. 9. 2. The dept h shal l not exceed t hat per mi t t ed i n 3. 9. 2.

They shal l be exami ned as speci f i ed i n 4. 4. 9. Typi cal l ap and seamdi scont i nui t i es ar e shown i n f i gur e 6.

3. 9. 1. 2 I ncl usi ons. Cap scr ews shal l show no evi dence of sur f ace or subsur f acei ncl usi ons at t he t hr ead r oot when exami ned as speci f i ed i n 4. 4. 9. Smal li ncl usi ons i n ot her par t s of t he cap screws not i ndi cat i ve of unsat i sf act or yqual i t y, shal l not be cause f or r ej ecti on.

3. 9. 1. 3 Tool marks. Tool marks or undercut s of dept hs not exceedi ng t hoseshown i n t abl e I I and f i gur e 8 ar e accept abl e. Sur f ace di scont i nui t i es such asni cks, gouges, dent s, scrat ches, and scr apes are per mi ssi bl e i f t hey do not i mpai rt he f uncti onabi l i t y of t he pr oduct.

TABLE I I . Li mi t s of t ool marks or under cut s.

Si zeDept h

( I nch Max. )

Up t o 3/ 8 i nch 0. 003Over 3/ 8 t o 5/ 8 i nch 0. 004Over 5/ 8 t o 7/ 8 i nch 0. 005

Over 7/ 8 i nch 0. 006

3. 9. 1. 4 Voi ds. Voi ds ar e per mi ssi bl e di scont i nui t i es i f i n t he l i mi t s speci f i edi n 4. 4. 9. 2. Typi cal voi ds ar e shown i n f i gur e 8.



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3. 9. 1. 5 Fol ds. Fol ds may occur at or near t he i nt er sect i on of di amet er changes.Fol ds at ext er i or cor ner s ar e per mi ssi bl e di scont i nui t i es i f wi t hi n t he l i mi t s

speci f i ed i n 4. 4. 9. 3. Typi cal f ol ds ar e shown i n f i gur e 7.

3. 9. 1. 6 Bur st s. Cap scr ews may possess bur st s t hat occur at t he f l at of t hehead of screws i f wi t hi n t he l i mi t s speci f i ed i n 4. 4. 9. 4. Typi cal bur st s ar eshown i n f i gur e 7.

3. 9. 2 Thr ead di scont i nui t i es. ( Laps, seams, and sur f ace i r r egul ar i t i es) . Threads shal l have no l aps at t he r oot or al ong t he f l anks as shown i n f i gure 6.Laps are per mi ssi bl e at t he cr est but shal l not exceed 25 percent of t he basi ct hr ead dept h. Sl i ght devi at i on f r om t he t hr ead cont our i s per mi ssi bl e at t hecr est of t he t hr ead as shown i n f i gure 6. Magnet i c i nspect i on t echni ques may beused i n accor dance wi t h 4. 4. 9.

3. 9. 3 Cr acks. Cap screws shal l be f r ee f r om cr acks i n any di r ect i on orl ocat i on.

3. 9. 3. 1 Quench cr acks. Quench cr acks may occur dur i ng heat t r eat ment andusual l y t r aver se an i r r egul ar and er r at i c cour se on t he sur f ace of t he screw.

They shal l be exami ned as speci f i ed i n 4. 4. 9. Typi cal quench cr acks ar e as shown

i n f i gure 7.

3. 9. 3. 2 For gi ng cracks. For gi ng cracks may occur dur i ng t he cut - of f or f or gi ngoperat i ons and are l ocat ed on t he t op of t he head of scr ews. They shal l beexami ned as speci f i ed i n 4. 4. 9. Typi cal f or gi ng cracks are shown i n f i gur e 7.

4. QUALI TY ASSURANCE PROVI SI ONS

4. 1 Responsi bi l i t y f or i nspect i on. The cont r act or i s r esponsi bl e f or theperf ormance of al l i nspect i on r equi r ement s as speci f i ed her ei n. Except asot her wi se speci f i ed, t he suppl i er may use hi s own or any ot her f aci l i t i es sui t abl ef or t he i nspect i on r equi r ement s speci f i ed her ei n, unl ess di sappr oved by t heGover nment . I nspect i on r ecords of t he exami nat i on and t est s wi t h i t emi zed r esul t sshal l be kept compl et e at t he manuf act ur er’ s f aci l i t y, avai l abl e t o t he Gover nmentt hr oughout t he dur at i on of t he cont r act , or a mi ni mum of t wo year s, whi chever i sl onger . The Government r eserves t he r i ght t o per f orm any of t he i nspect i ons setf ort h i n the speci f i cat i on wher e such i nspect i ons are deemed necessary t o assuresuppl i es and ser vi ces conf orm t o pr escr i bed requi r ement s.

4. 1. 1 Responsi bi l i t y f or compl i ance. Al l i t ems shal l meet al l r equi r ement s ofsect i ons 3 and 5. The i nspect i on set f ort h i n t hi s document shal l become a par tof t he cont r act or ’ s over al l i nspect i on system or qual i t y pr ogr am. The absence ofany i nspect i on r equi r ement s i n thi s document shal l not r el i eve t he cont r act or oft he r esponsi bi l i t y of ensur i ng t hat al l pr oduct s or suppl i es submi t t ed t o theGovernment f or accept ance compl y wi t h al l r equi r ement s of t he cont r act . Sampl i ngi nspect i on, as par t of manuf act ur i ng requi r ement s, i s an accept abl e pr act i ce t ocert ai n conf ormance t o r equi r ement s, however, t hi s does not aut hor i ze submi ssi onof known def ect i ve mat er i al ei t her i ndi cat ed or act ual , nor does i t commi t t heGovernment t o accept def ect i ve mater i al .

4. 1. 2 Component and mater i al i nspect i on. Component s and materi al s shal l bei nspect ed i n accor dance wi t h al l t he r equi r ement s speci f i ed her ei n and i nappl i cat i on r ef er enced document s.

4. 1. 3 Exami nat i on of prepar at i on f or del i ver y. An exami nat i on shal l be made t odet ermi ne t hat t he packagi ng, packi ng and marki ng compl y wi t h t he r equi r ement s i nSecti on 5 of t hi s speci f i cat i on.



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4. 2 Sampl i ng f or l ot accept ance.

4. 2. 1 I nspect i on l ot . A l ot shal l consi st of cap screws of t he same t ype,si ze, mat er i al , coat i ng and t hr ead ser i es of f er ed f or del i ver y at one ti me.

4. 2. 2 Sampl i ng f or exami nat i on of cap scr ews. A r andom sampl e of cap scr ewsshal l be sel ect ed f r om each l ot i n accor dance wi t h ASQ Z1. 4, I nspect i on Level S- 4.

The Acceptabl e Qual i t y Level ( AQL) shal l be as i ndi cat ed i n t abl e I I I . Unl essot her wi se speci f i ed, t he AQLs l i st ed i n t hi s i nspect i on shal l be used t o est abl i sht he sampl e si ze, however, t he accept ance number shal l be zero.

TABLE I I I . Cl assi f i cat i on of def ect s.

Cat egor i es Def ect s I nspect i onmet hod

Cr i t i cal AQL = 1. 0 per cent1 Cr acks ( 3. 9. 3) Mi croscope or S. I . E. *

Maj or AQL = 2. 5 per cent101 Thr ead, si ze and f orm ( 3. 3. 1 and 3. 3. 2) Thr ead r i ng gauge Go and No Go

102 Thr ead l engt hs ( 3. 3. 2) S. I . E. *103 Di scont i nui t i es ( 3. 9. 1) S. I . E. *104 Sel f - l ocki ng el ement mi ssi ng, when

appl i cabl e ( 3. 1. 6)Vi sual

Mi nor AQL = 4. 0 per cent201 Lengt h ( 3. 3. 1) S. I . E. *202 Sur f ace r oughness ( 3. 6) Vi sual203 Coat ed t hr eads ( when appl i cabl e) ( 3. 3. 3) Vi sual204 Head marki ng ( 3. 8) Vi sual

*St andard I nspect i on Equi pment

4. 2. 3 Sampl i ng f or mechani cal pr oper t i es and met al l ogr aphi c test s. A r andom

sampl e of cap screws shal l be sel ect ed f r omeach l ot i n accor dance wi t h ASQ Z1. 4,I nspect i on Level S- 1. The AQL shal l be 1. 5 per cent def ect i ve.

4. 2. 3. 1 Sampl es sel ect ed as speci f i ed i n 4. 2. 3 may be used when pr act i cabl e. Three quar t er i nch and l arger t est speci mens processed wi t h t he l ot may be usedf or destr ucti ve t esti ng.

4. 2. 4 Chemi cal anal ysi s. Chemi cal anal ysi s shal l be made i n accor dance wi t hASTM E1282. When a cer t i f i cat e cover i ng t hese r equi r ement s can be f ur ni shed, i twi l l be accept abl e.

4. 2. 5 Sampl i ng f or packagi ng and packi ng. Sampl i ng f or i nspect i on of packagi ngand packi ng shal l be i n accordance wi t h ASTM D3951.

4. 2. 6 Sampl i ng f or mer cur ous ni t r at e t est . When speci f i ed ( see 6. 2) , a r andomsampl e shal l be t aken f r omeach l ot of col d- worked naval br ass screws i naccor dance wi t h ASQ Z1. 4, I nspect i on Level S- 1. Any one def ect shal l causer ej ect i on of t he r epr esent ed l ot .



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4. 3 Exami nat i on.

4. 3. 1 Vi sual and di mensi onal i nspect i on. Each cap scr ew sel ect ed as speci f i edi n 4. 2. 2 shal l be exami ned t o ver i f y conf or mance wi t h t hi s speci f i cat i on.Exami nat i on shal l be conduct ed i n accor dance wi t h t abl e I I I . Any screw havi ng oneor more def ect s shal l be rej ect ed and i f t he number of def ect i ve scr ews i n anysampl e exceed the accept ance number of t he sampl e, t he l ot r epr esent ed by t he

sampl e shal l be r ej ect ed. Ret ests shal l be i n accor dance wi t h ASQ Z1. 4.

4. 3. 2 I nspect i on of packagi ng and packi ng. I nspect i on of packagi ng and packi ngi ncl udi ng pr eservat i on and mar ki ng of packages and cont ai ner s shal l be i naccordance wi t h ASTM D3951.

4. 4 Test pr ocedur e.

4. 4. 1 The t est speci f i ed i n 4. 4. 2 and 4. 4. 3 shal l be r equi r ed, t he t est sspeci f i ed i n 4. 4. 4 thr ough 4. 4. 13 may be requi r ed at t he opt i on of t he Government .

4. 4. 2 Hardness. Hardness t est f or cap scr ew shal l be conduct ed i n accor dancewi t h ASTM E10 and ASTM E18 on t r ansverse sect i on t hrough t he thr eaded port i on oft he screw, t aken one nomi nal di amet er f r omt he poi nt , or when t oo short , hal f way

between t he bear i ng sur f ace and t he poi nt . Hardness shal l be measured at a poi nton t he sect i on, one quar t er di amet er f r omt he axi s of t he scr ew. For scr ews thr eequart er i nch and l arger , t est may be made on a test speci men.

4. 4. 3 Tensi l e. Tensi l e t est shal l be conduct ed i n accor dance wi t h ASTM F606.Unl ess ot her wi se speci f i ed (see 6. 2) , Gr ade 2, l ow car bon st eel scr ews shal l notbe subj ect ed t o t hi s t est .

4. 4. 3. 1 Ful l si ze speci mens. When t est i ng equi pment i s avai l abl e cap scr ewsshal l be t est ed f ul l si ze, pr ef er abl y usi ng appar at us si mi l ar t o t hat i l l ust r at edi n f i gure 2.

4. 4. 3. 2 Tur ned shank speci mens. For t est i ng cap scr ews havi ng t ensi l epr opert i es gr eat er t han can be measured on avai l abl e test equi pment , t he shank ort est speci men shal l be tur ned down around t he axi s, t o gage di mensi ons speci f i edi n ASTM F606. For t est i ng cap screws or t est speci mens t oo l ar ge f or f ul l si zet est i ng, t he speci men shal l be t ur ned, have i t s axi s mi dway bet ween the axi s oft he shank and t he sur f ace of t he shank, as i l l ust r at ed i n f i gur e 4.

4. 4. 3. 3 Duct i l i t y t est speci mens. Test f or el ongat i on and r educt i on i n ar eashal l be conduct ed on t ur ned shank speci mens ( f i gur e 3) havi ng di mensi ons t o t hel ar gest pr act i cal speci mens ( see 4. 4. 3) .

4. 4. 3. 4 Scr ews too short t o be t ensi l e st r engt h t est ed as def i ned i n ASTM F606shal l be har dness t est ed i n accor dance wi t h NASM1312- 6. I f t he har dness l i mi t sare not speci f i ed, scr ews shal l meet t he mi ni mum hardness requi r ement of t hemateri al f r om whi ch they were made.



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4. 4. 4 Met al l ogr aphi c t est s.

4. 4. 4. 1 Decar bur i zat i on. To t est f or decar bur i zat i on ( see 3. 5. 1) , t he t hr eadedpar t shal l be sect i oned l ongi t udi nal l y thr ough t he axi s and pol i shed i n such amanner t hat r oundi ng of t he t hr ead edges i s hel d t o a mi ni mum. The sect i on shal lbe etched wi t h t he usual metal l ogr aphi c et chant s ( such as ni t al ) and exami ned wi t ha metal l ogr aphi c mi cr oscope. Measurement s shal l be made f r om t he crest of t he

t hr ead t o t he end of t he decar bur i zed zone. Such di st ance shal l not exceed t hati ndi cat ed i n f i gur e 1 ( see 6. 4) . Measur ement s shal l be made wi t h a f i xed- scal emi cr omet er eye- pi ece, or t he i mage of t he t hreadi ng may be t hrown on t he groundgl ass of t he camera and measurement s made wi t h a pai r of di vi der s and a scal e.

Thi s does not appl y t o aust eni t i c grades of st ai nl ess st eel .

4. 4. 4. 2 Gr ai n si ze of copper al l oys. Det er mi nat i on of grai n si ze of copperal l oy shal l be made i n accordance wi t h ASTM E112.

4. 4. 5 Pr ot ect i ve coat i ng t est . Pr ot ect i ve coat i ng and pl at i ng t est s shal l beconduct ed i n accor dance wi t h t he appl i cabl e speci f i cat i ons shown i n 3. 4. 3 t hr ough3. 4. 7.

4. 6 Passi vat i on t est . Passi vat i on t est shal l be conduct ed i n accor dance wi t h

SAE- AMS- QQ- P- 35.

4. 4. 7 Hydr ogen embr i t t l ement . The cont r actor shal l f ur ni sh t he Governmentcer t i f i cat i on t hat el ect r opl at ed or phosphat e coat ed al l oy st eel screws have beensubj ect ed t o t he hydr ogen embr i t t l ement r el i ef t r eatment speci f i ed i n 3. 4. 8. Whenspeci f i ed (see 6. 2) , el ect r opl at ed or phosphat e coat ed scr ews shal l be subj ect edt o t he embr i t t l ement r el i ef t est speci f i ed i n t he appl i cabl e pl at i ng or coat i ngspeci f i cat i on.

4. 4. 8 Magnet i c per meabi l i t y. Aust eni t i c cor r osi on r esi st i ng st eel cap screws,subj ect ed t o vi sual and di mensi onal exami nat i on, shal l al so be t ested t o deter mi nemagnet i c per meabi l i t y ( see 3. 1. 4. 1) i n accor dance wi t h ASTM A342.

4. 4. 9 Di scont i nui t i es. Magnet i c par t i cl e i nspect i on per f or med i n accor dancewi t h ASTM E1444 or l i qui d penet r ant i nspect i n perf ormed i n accor dance wi t h ASTME1417 shal l be used t o determi ne t he pr esence of cr acks and di scont i nui t i es suchas l aps, seams, and i ncl usi ons. Magnet i c par t i cl e or penet r ant i ndi cat i ons al oneshal l not be cause f or r ej ect i on, and such scr ews may be sect i oned anddi scont i nui t i es measur ed mi cr oscopi cal l y under 10X magni f i cat i on t o deter mi neconf ormance t o t he r equi r ement s of 3. 9. The i nspect i on shal l be perf ormed onunf i ni shed cap scr ews, f r ee of l ubr i cat i on and subsequent t o any pr ocessi ngoper at i on whi ch coul d adver sel y af f ect t he cap scr ews.

4. 4. 9. 1 Tool mar ks. Tool marks on t he beari ng sur f ace are permi ssi bl edi scont i nui t i es provi di ng t hat t he sur f ace roughness does not exceed 125mi cr oi nches, det ermi ned as t he ar i t hmet i c aver age devi at i on f r omt he mean sur f ace.

Tool mar ks on ot her sur f aces ar e permi ss i bl e di scont i nui t i es and shal l not because f or r ej ect i on of ot her wi se accept abl e scr ews.

4. 4. 9. 2 Voi ds. Voi ds on t he bear i ng sur f ace of t he scr ews ar e per mi ssi bl edi scont i nui t i es pr ovi di ng t hat no voi d has a dept h gr eater t han 0. 010 i nch andt hat t he combi ned ar ea of al l voi ds does not exceed 5 per cent of t he speci f i edmi ni mum ar ea of t he bear i ng sur f ace.

4. 4. 9. 3 Fol ds. Fol ds l ocat ed i n i nt er nal cor ner s at or bel ow t he bear i ngsur f ace, e. g. i n t he f i l l et at t he j unct i on of head and shank, ar e not per mi t t ed.



FF- S- 85D

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4. 4. 9. 4 Bur st s. Bur st s i n t he f l at s of hexagon head screws ar e per mi ssi bl e

di scont i nui t i es pr ovi di ng t hat no bur st has a wi dt h or an open dept h gr eat er t han0. 010 i nch pl us 0. 025D, wher e D i s t he nomi nal scr ew si ze i n i nches. No burs tshal l extend i nt o t he bear i ng sur f ace.

4. 4. 10 Sel f - l ocki ng. Sel f - l ocki ng screws havi ng non- met al l i c el ement s shal l be

t est ed i n accor dance wi t h MI L- DTL- 18240.

4. 4. 11 Mer cur ous ni t r at e ( st r ess r el i ef ) t est . The cont r actor shal l f ur ni sht he government cert i f i cat i on t hat col d worked naval br ass scr ews have beensubj ect ed t o t he st r ess rel i ef t r eat ment speci f i ed i n 3. 1. 5. 1. When speci f i ed( see 6. 2) , sampl es taken as speci f i ed i n 4. 2. 6 shal l be subj ect ed t o a mer cur ousni t r ate t est conduct ed i n accor dance wi t h ASTM B154. There shal l be no evi denceof cracks.

4. 4. 12 Pr oof l oad. Pr oof l oad t est f or cap scr ews shal l be conduct ed i naccor dance wi t h ASTM F606.

4. 4. 13 Yi el d st r engt h. Yi el d st r engt h t est f or cap screws shal l be conduct edi n accor dance wi t h ASTM F606.

5. PACKAGI NG

5. 1 Packagi ng. For acqui si t i on pur poses, t he packagi ng r equi r ement s shal l beas speci f i ed i n t he cont r act or or der ( see 6. 2) . When packagi ng of mat er i el i s t obe perf ormed by DoD or i n- house cont r actor personnel , t hese personnel need t ocont act t he r esponsi bl e packagi ng act i vi t y t o ascer t ai n packagi ng r equi r ement s.Packagi ng r equi r ement s are mai ntai ned by the I nvent ory Cont r ol Poi nt ’ s packagi ngact i vi t i es wi t hi n t he Mi l i t ar y Ser vi ce or Def ense Agency, or wi t hi n t he mi l i t ar yser vi ce’ s system commands. Packagi ng dat a r et r i eval i s avai l abl e f r om t hemanagi ng Mi l i t ary Depart ment ’ s or Def ense Agency’ s aut omated packagi ng f i l es,CD- ROM pr oduct s, or by cont act i ng the r esponsi bl e packagi ng act i vi t y.

6. NOTES

6. 1 I ntended use. Hexagon head and sl ot t ed head cap scr ews are desi gnedpr i mar i l y f or use i n pr eci si on machi ne t ool s and si mi l ar appl i cat i ons. They ar ecommonl y used i n tapped hol es, but may be used wi t h nut s.

6. 2 Or der i ng dat a. Pur chasers shoul d sel ect t he pr ef er r ed opt i ons per mi t t edherei n and i ncl ude t he f ol l owi ng i nf ormat i on i n pr ocur ement document s:

( a) Ti t l e, number , and dat e of t hi s speci f i cat i on.( b) Type and st yl e, gr ade ( f or car bon and al l oy st eel ) , and si ze or st andar d

part number ( 1. 2) .( c) Mat er i al and condi t i on ( 3. 1) .( d) Mechani cal pr oper t i es, i f ot her t han t hose speci f i ed i n Tabl es I

and I A ( 3. 2) .( e) Lengt h, t hr ead ser i es, cl ass, and hand ( 3. 3) .

( f ) Coat i ng, i f r equi r ed, and whet her t hr ead shal l conf or m t odi f f er ent si ze r equi r ement s ( 3. 3. 3 and 3. 4) .

( g) Decarburi zat i on t est, i f r equi r ed ( 3. 5. 1) .( h) Copper al l oy gr ai n si ze, i f r equi r ed ( 3. 5. 2) .( i ) Surf ace roughness, i f di f f erent ( 3. 6) .( j ) Met hod of manuf act ur e, i f necessar y ( 3. 7)( k) Mat er i al cert i f i cat i on, i f appl i cabl e ( 4. 2. 4) .( l ) Har dness and t ensi l e t est s ( 4. 4. 2 and 4. 4. 3) .( m) Met al l ogr aphi c t est s, i f r equi r ed ( 4. 4. 4) .



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( n) Sel ect i on of appl i cabl e l evel of packagi ng and packi ng r equi r ed(5. 1) .

( o) Embri t t l ement rel i ef t est, i f r equi r ed ( 4. 4. 7) .( p) Mer cur ous ni t r at e t est , i f r equi r ed ( 4. 4. 11) .( q) Pr oof l oad t est, i f r equi r ed ( 4. 4. 12) .( r ) Yi el d str engt h t est, i f requi red ( 4. 4. 13) .

6. 3 Mi l i t ar y pr ocur ement . I t ems pr ocur ed under t hi s speci f i cat i on f or Mi l i t ar yuse shal l be l i mi t ed t o the var i et y and mat er i al s speci f i ed on t he appl i cabl e MS.Cap scr ews of l ow car bon st eel ar e non- pr ef er r ed f or mi l i t ar y use. Per sonnel oft he Mi l i t ar y depart ment s are request ed to ref er t o t hese document s f or gui dance.

6. 4 Def i ni t i ons.

6. 4. 1 Addendum, f i gur e 1. The addendum symbol "ha" i s def i ned i nFED- STD- H28/ 1, Nomemcl atur e, Def i ni t i ons and Let t er Symbol s f or Screw Thr eads as:"The di st ance measured perpendi cul ar l y t o t he axi s, between the maj or and pi t chcyl i nder or cones, r espect i vel y.

6. 4. 2 Cr acks. A cr ack i s a cl ean crystal l i ne br eak passi ng t hr ough t he gr ai nor gr ai n boundar y wi t hout t he i ncl usi on of f or ei gn el ement s.

6. 4. 2. 1 Quench cr acks. Quench cr acks ar e f r act ur es occur r i ng dur i ng heatt r eat ment , due to excessi ve hi gh t hermal and t r ansf ormat i on st r esses.

6. 4. 2. 2 For gi ng cr acks. For gi ng cr acks ar e cr acks t hat may occurdur i ng t he cut - of f or f or gi ng oper at i ons.

6. 4. 3 Lap. A l ap i s a sur f ace def ect appear i ng as a seam, caused byt he f ol di ng over of met al f i ns or shar p cor ner s and t hen r ol l i ng or f orgi ngt hem i nt o t he sur f ace, but not wel di ng them.

6. 4. 4 Seam. A seami s an unwel ded f ol d or l ap whi ch appears as anopeni ng i n t he r aw mat er i al as r ecei ved f r omt he sour ce.

6. 4. 5 I ncl usi ons. I ncl usi ons ar e non- met al l i c mat er i al i n a sol i dmet al l i c mat r i x.

6. 4. 6 Tool mar ks. Tool mar ks ar e l ongi t udi nal or ci r cumf er ent i algrooves of shal l ow depth pr oduced by t he movement of manuf act uri ng t ool sover t he sur f ace of t he scr ew.

6. 4. 7 Voi d. A voi d i s a shal l ow pocket or hol l ow on t he sur f ace oft he screw due to non- f i l l i ng of met al dur i ng f or gi ng or upset t i ng.

6. 4. 8 Fol d. A f ol d i s a doubl i ng over of met al whi ch may occurdur i ng t he f or gi ng oper at i on.

6. 4. 9 Bur st . A bur st i s an open br eak i n t he met al .

6. 5 Subj ect t er m ( keywor d) l i st i ng.

Sl ot t ed head scr ewPl ai n head scr ewScr ew t hread

6. 6 Changes f r om pr evi ous i ssue. Ast er i sks ( or ver t i cal l i nes) ar e not used i nt hi s r evi si on t o i dent i f y changes wi t h r espect t o t he pr evi ous i ssue due t o theext ensi ve changes.



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FIGURE 2. Tension testing full-size screw.

FIGURE 4. Location of standard, round, 2-inch-gage-length, tension-testspecimen when turned from large-size screw.

FIGURE 3. Tension-test specimen for screw with turned-down shank.



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FF- S- 85D

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FF- S- 85D

MI LI TARY I NTERESTS

Cust odi ans: Pr epar i ng act i vi t y:

Ar my - AR DLA- I SNavy - SHAi r For ce - 99 ( Proj ect No. 5305- 2557)

Revi ew acti vi t i es:Army - AVNavy - ASAi r For ce - 71NSA – NS

NOTE: The act i vi t i es l i st ed above wer e i nt er ested i n t hi s document as oft he dat e of t hi s document . Si nce or gani zat i ons and r esponsi bi l i t i es canchange, you shoul d ver i f y t he cur r ency of t he i nf ormat i on above usi ng theASSI ST Onl i ne dat abase at ht t p: / / assi st. daps. dl a. mi l .

ff-s-85d-screws

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