3815

Indian Standard SPECIFICATION FdR

POINT HOOKS WITH SHANK FOR GENERAL ENGINEERING PURPOSES

Lifting Chains and Associated Fittings and Components Sectional Committee, EDC 49

Chairman Represenling

DR K. N. SINAI Central Mining Rexarch Station (CSIR), Dhanbad

Members

SHRI KULDIP GRAND Directorate General of Supplies & Dirposals, New Delhi

Sum A. N. KAMPANI ( Allmale ) DEPUTY DIRECTOR ( MET-II ) R-arch Designm and

Chittaranjan Standards Organizadon,

AMMTANT DIRECTOR ( WF.L- DINQ ) ( dkmcrtc )

Dtmm~ DIRECTOR STANDARADS ( LOCO )

Ministry of Railways

AEBIBTANT DIRECTOR ( WELDING) ( Alternate )

SHRI I& GAN*PA~Y Jcssop & Co Ltd, Calcutta Hindustan Steel Ltd, Ranchi W. H. Brady & Co Ltd, Bombay

SHRI G. C. JAIN SXRI K. B. KALE

SHRI C. K. RADHARRISANAN ( Altmrnah ) SRRI S. KANTHURI Ministry of Tranaport & Shipping (Transport

Wing ), New Delhi SHRI P. RAJAQOPAL MENON &ara India, Madras

SARI P. M. NITY~NANDAN ( Akma& ) SHRI P. K. Muasrrr Indian Mining Association, Calcutta

SERI L. FLACK ( Al&mate) SHRI P. K. NEVATIA SHRI v. A. OZA

Indian Link Chain Manufacturers Ltd, Bombay Ashok Steel Chain Manufacturing Co, Bombay

SHRI F. M. FERN~NDIZ ( Altemaie ) SRRI B. J. RAMRAKHUNI Directorate General Factory Advice Service &

Labour Institutes ( Ministry of Labour, Employ_

SHRI H. N. JAOTIANI ( Al&na& ) ment & Rehabilitation ), Bombay

Saw H. A. RAXBDALE Gm Miller & Co Private Ltd, Calcutta SHRX P. CEATTEEJEE ( Altern& )

( Coatinued OR pap 2 )

INDIAN STANDARDS INSTITUTION MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI

( Continued from pugc 1 )

MrmbcTS Representing

SHRI K.C. SADHUKHAN The Commissioners for the Port of Calcutta, Calcutta SHRI B. R. ~liA’lJTEttJEE ( AflernaL ) Sam N. K. SEN GUPTA Mining and Allied Machinery Corporation Ltd,

Durgapur SHRI T. R. TRIQARAJAN

MAJ P. S. CHAWLA ( Alternate ) Ministry of Defence ( R & D )

SHRI M. V. PATANXAR, Director General, IS1 ( Eu-oJcio Membsr ) Director ( Mech Engg )

Secre/a7y

SHHI M.G. KRISHNA RAO

Deputy Director ( Mech Engg ). ISI

Hooks and Ancillaries Subcommittee, EDC 49 : 3

Conucncr SHRI H. N. JAOTIANI

Members

Directorate General Factory Advice Service & Lahour Institutes ( Ministry of Labour, Employment & Rehabilitation ), Bombay

Research Designs & Standards Organization, Lucknow

India Forge &-Drop Stampings Ltd, Madras 1 SRRI PREX CHONA ( Altcrnuk ,

SABI S. K. Bnsn Hindustan Steel Ltd, Ranchi SHRI T. C. SHARM_~ ( Alternate )

SHBI G. v. GHELLAM Ministry of Transport & Shipping ( Roads Wig ), New Delhi

SHRI B. K. DEV eaop & Co Ltd, Calcutta SARI T. C. GHOSAL h e Indian Sandard Wagon Co Ltd, Calcutta

SHRI S. P. GHOSAL ( Alternate ) SnBl K. c. SADHURA~N The Commissioners for the Port of Calcutta, Calcutta

SHRI B. R. CHATTERJEE ( Alkrnotc )

4

2

ls:3815-1969

Indian Standard SPECIFICATION FOR

POINT HOOKS WITH SWANK FOR GENERAL ENGINEERING PURPOSES

0; FOREWORD

0.1 This Indian Standard was adopted by the Indian Standards Institu- tion on 31 March 1969, after the draft finalized by the Lifting Chains and Associated Fittings and Components Sectional Committee had been approved by the Mechanical Engineering Division Council.

0.2 Hooks form an important part of lifting gears extensively used for a construction, erection and operation in industrial establishments, and for material handling.

0.3 The hook may be of circular cross-section or of trapezoidal section. The hooks may be specified with screwed shanks or with eyes. Point hooks with screwed shanks have been covered in this standard. The standard trapezoidal section specified here is the closest approximation to the theoretical optimttm triangular section and is to be preferred to the circular section hooks wherever possible. For small loads users may prefer a trapezoidal section of increased internal diameter compared,to that of the standard trapezoidal section. A special trapezoidal section to meet this need is also included.

0.4 Shank hooks are not generally specified beyond the safe working load d 40 tonnes in Grade 30 material or 50 tonnes in Grade 40 material though the range up to 50 tonnes is covered for both the materials for standard trapezoidal section hooks in this standard. For safe working loads exceeding 40 tonnes IS : 3177-1965* recommends the use of ram- shorn hooks and lifting eyes.

0.5 On account of the need for reliability, it is recommended that supplies should be obtained from manufacturers possessing adequate facilities for heat treatment and testing equipment and employing competent staff for inspection.

*Code of practice for design of overhead travclling cranes and gantry cranes other than steel work cranes.

3

IS:3815-1969

0.6 Users are warned that the hook shall not be taken as complying with this standard unless the specified tests have been made and the test requirements obtained in the presence of a person representing or approved by the purchaser.

0.7 For normal conditions of use, the maximum permissible load ( safe working load ) shall not exceed the values given in Tables 1, 2 and 3. When the conditions of working are extremely hazardous or severe, the permissible working load should be substantially less.

0.8 The information to be supplied with the enquiry and order is given in Appendix A.

0.9 In the preparation of this standard assistance has been derived from B. S. 482 : 1968 ’ Wrought iron and mild steel hooks for cranes, slings, blocks and general engineering purposes ( excluding building operations )’ and Dot : 67/31284 ‘Steel higher tensile hooks ( revision of B. S. 2903 )’ issued by the British Standards Institution.

0.10 For the purpose of deciding whether a particular requirement of this standard is complied with, final. value, observed or calculated, expre&ing the result of a test or analysis, shall be rounded off in accordance with IS : 2-1960*. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

1. SCOPE

1.1 This standard covers the requirements of mild steel and higher tensile steel point hooks with shank for general engineering purposes.

2. TERMINOLOGY

2.0 For the purpose of this standati, the following definitions shall apply.

2.1 Rating-The maximum safe working load which the hook shall withstand.

2.2 Proof Load-The load to which the hook shall be subjected in the finished condition (see 9.2).

2.3 Processing --4ny trea:ment of the hook subsequent to forging, such as, heat treatment, polishing, etc.

2.4 Competent Person - A person who is approved and ~declared as such under the relevant statutory provisions.

*R&S for rounding~off numerical values ( revised 1.

4

IS : 3815 - 1969

3. TYPE AND RATH’IG

3.1 The hooks shall be made of mild steel or higher tensile steel and shall be any one of the following types as may be specified by the purchaser:

a) Circular section shank hook,

b) Standard trapezoidal section shank hook, and

c) Special trapezoidal section shank hook.

3.2 The hooks shall be rated according to safe working load given in Tables 1, 2 and 3 for types (a), (~b) and (c) respectively.

4. MATERIlhL

4.1 Mild steel hooks shall be made of material conforming to grade 2 of IS : 1875-\96fj* 01‘ from material having equivalent mechanical properties.

4.2 Higher tensile steel hooks shall be made of material conforming to grade 3 of 1875-1966* or from material having equivalent mechanical properties.

4.3 If required by the purchaser at the time of placing the order, the manufacturer shall supply a copy of steel maker’s cast analysis.

5. FORM AND DIMENSIONS

5.1 The form and dimensions of hooks shall be in accordance with the following:

a) Circular section shank hook -Table 1 and the figure,

b) Standard trapezoidal section shank hook-Table 2 and the figure, and

c) Special trapezoidal section shank hook -Table 3 and the figure.

5.1.1 Trapezoidal section point hooks whose dimensions and safe work_ ing loads differ from those in Tables 2 and 3 may be designed as special hooks to this standard provided that the section is geometrically similar to the specified hook section and other requirements of this standard are complied with.

5.2 Tolerance OP Dimensions

5.2.1 Tolerances on Drop-Forged Hooks -The tolerwces on drop-forged hooks shall be as given in IS : 3469-19667.

*Specification for carbon steel billets, blooms and slebs for forgings ( r&rd ). tSpecification for tolerances for steel drop forgings, press forgings and forged bars.

5

IS:SSlS-1969

5.2.2 Tolerances on Hand-Forged Hooks -Forged dimensions shall not be less than the values given in Tables 1, 2 and 3 and shall not exceed these by more than the following amounts:

30 percent on the radius and dimensions 5, and

8 percent on all other dimensions.

C being a critical dimension it is recommended that it is as nearly as possible to size. .

5.3 Shank Details

5.3.1 Diameter of the Shank -A plus allowance shall be made when forging the shank to allow for machining the diameter of the shank and the diameter at the top of the screw thread. In all cases a fillet or radius shall be machined at the junction of the shank and the forged diameter adjacent to the shank.

5.3.2 Threaded Length-The length of the screwed portion of the shank shall not be less than the nominal thread diameter. If the shank and the nut which secures it are drilled to take a fixing or retaining pin or for any other purpose, these shall remain a continuous length of the shank engaged by thenut on the load side at least equal to the diameter of the shank.

6, WORKMANSHIP AND FINISH

6.1 The hooks shall be free from defects and shall be cleanly forged in such a manner that the macroscopic flow lines follow the body outline of the hook. The whole of the shank shall be forged in one piece, integral with the hook. The finished hook shall be clean and free from ~coating of any <iescription unless otherwise specified by the purchaser. The hook shall be free from any welding.

7. HEAT TREATMENT

7.1 All hooks shall, before proof testing, be subjected to one of the follow- illg heat treatments as agreed to between the purchaser and the manufacturer:

a) Normalizing by heating to a temperature within 50 deg C above the upper critical point of the steel used, followed by cooling in still air.

b) Hardening and tempering by heating to a temperature within 50 deg C above the upper critical point of the steel used followed by quenching in oil or water and tempering.

7.2 Details of the heat treatment which has been given to the hooks during manufacture shall be endorsed on the maker’s test certificate.

6

IS:3815- 1969

8. PROOF TESTING

8.Vzh; testing machine shall conform to the requirements given in App- .

8.2 After heat treatment, the finished hooks shall be su.bjectcd to a proof load of twice the safe working load given in Tables 1, 2 and 3. Prior to the application of the proof load, each hook shall bear two centre punch marks at positions a and b as shown in Fig. 1. The change in distance

between a and b before applying proof load and after removal of proof load is the amount of permanent set and shall not exceed 0.25 percent of the initial distance. After removal of the proof load and determination of the permanent set, each hook shall be thoroughly examined by a competent person and shall be accepted as complying with this standard only if found free from any flaw or defects.

QUALITY MARK

NOTE 1 - Points ( (1 and 6 ) between which the hook shaJt after proof testing and recommended position for marking load.

NOTE 2 - Location of point o to b within 10 mm from I+ of the swivel and point 6 at the centre of the nose radius;

FIG. 1 MARKING ON HOOKS

be measured before and hook with safe working

edge on the centre line

8.3 In case proof load testing facilities are not available at the manufacturer’s works, the manufacturer shall carry out such proof test at a recog- nized or approved test house at his cost.

7

IS : 3815 - 1969

9. DESTRUCTION TEST

9.1 A sample hook shall be selected cut of a lot of every 50 hooks a& tested to destruction by the application of the test load. In the event of a purchaser desiring destruction tests to be carried out when the lot size is less then 50, he should specifically so state in his enquiry and order. The hook shall, at any load less than 5 times the safe working load, neither fracture nor so distort as to be incapable of retaining the load.

10. INSPECTION, CERTIFICATE OF TEST AND EXAMINATION

10.1 The representative of the purchaser shall have access to the works of the manufacturer at all reasonable times for the purposes of inspecting hooks at any stage of manufacture and for the purpose of witnessing the specified tests and inspecting the machine and methods of examination.

10.2 The manufacturer shall supply a certificate of test and examination in the form shown in Appendix C with every supply of hooks. The certificate shall give the results of all rests made.

For the purpose of this standard test certificate in Form V of the Indian Dock Labourers Regulation, 1948, is acceptable provided that it is endorsed in co1 2 by the manufacturer or supplier that the hooks comply in all respects with this standard and that it states the material of which the hooks are made, the details of heat treatment to which they have been subjected and the destructive test results.

11. MARKING

11.1 Quality Marking -Each hook shall be legibly marked as indicated 1 as follows: in Fig.

a)

b)

Normalized hook with the mark ‘3’ or ‘4’ for mild steel and higher tensile steel respectively.

Quenched and tempered hook with the mark ‘03’ or ‘04’ for mild steel and higher tensile steel respectively. The mark shall be

enclosed in a circle.

c) The stamps shall be of the following sizes:

Safe Working Load of Hook Shy of Mark

tonnes mm

Up to and including 2 3.5 Over 2, up to and including 8 5-O Over 8 6.5

The stamps used shall have a concave surface and the indentation shall be neither too sharp nor of excessive depths.

8

IS : 3815 - 1969

11.2 Identiacation Marking-Unless otherwise specified by the purchaser, each hook shall, after proof testing, be permanently and legibly stamped on a non-vital part (see Pig. 1 ), with the safe working load given in Tables 1, 2 and 3 and also with such individual marks or symbols as will allow indent&cation with the manufacturer’s certificate of test and examination.

11.3 Inapec%io~‘Markring-The eye hooks may also be marked with the ISI Certification Mark.

NOTE -The use of the ISI Certification Mark is governed by the provisions of the Indian Standards Institution ( Certification Marks ) Act, and the Rules and Regu- lations made thereunder. Presence of this mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements ofthat standard. under a well-defined system of inspection, testing and quality control during production. This system, which ts devised and supervised by IS1 and onerated by the producer, has the further safeguard that the products as actually marketed arr continuously checked by IS1 for conformity to the standard. Details of conditions, under which a licence for thr use of the IS1 Certification Mark may be granted t:, manufacture&x processors. may be obtained from the Indian Standards Institution.

APPENDIX A ( Chsu 0.8 )

INFORMATION TO BE SUPPLIED WITH THE

ENQUIRY AND ORDER

A-l. The enquiry and order should state:

a) the type of hook required (see 3.1);

b! whether mild steel or higher tensile steel;

cl safe working load (see Tables 1, 2 and 3 );

4 heat treatment required (see 7 ); and

e) further tests or chemical analysis required.

APPENDIX B ( Clause 8.1)

REQUIREMENTS OF TESTING MACHXNE$

El. The machine shall be accurate enough to take measurements within a tolerance off 5 percent of the proof load applied.

9

IS:3815- l!b@

B-2. Machines measuring the load by levers and weights or by pendulum shall be verified and adjusted as necessary by a competent independent person at intervals not greater than one year. For achines measuring the load other than by levers and weights or by pendu urn, ml the interval shall be not greater than three months. The testing machine shall be balanced in’the presence of the representative of the purchaser before the tests are made.

B-3. A signed certificate of the last examination shall be prominently dis- played adjacent to the machine.

B-4. Adequate facilities shall be provided, with suitable lighting for examining the chains after they are proof-tested.

APPENDIX C (Clause 10.2)

PRO-FORMA FOR THE CERTIFICATE OF TEST AND EXAMINATION

)IBTIN~UI~H- INO MARK

(1)

)R~CRIPTI~I- OF HOOKS

(2)

MATE- NUMBER RIAL TESTED

(3) (4) (5) I

(6) I

(7) I

tonnes tonnes tonnes

J

Particulars of heat treatment to which the hooks have been subjected, stating temperatures and methods of cooling, are as follows:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

We hereby certify that the hooks described above, comply in all res- pect with IS : 3815-1969 and that they were-subjected to proof load and subsequently examined and passed by a competent person.

Signature

Date

10

TABLE 2 DIMENSIONS FOR STANDARD TRAPEZOIDAL SECTION POINT HOOKS WITE SEiANX

[clouO.7,3.2,5.1 (b),5.l.l,5.2.2,8.2nnl11.2]

All dimrmians in milbnetra.

1369.I%1 ‘ Dimmionr orscrew thread run outa and UndercuO’.

I IIMS 74 35 39 34 ~ 27 15 M I4 ’ 25 20 25 0.5 I w. 63 3.9 :: 33 29 / 23 12 M I2

1 I I I I I I i , ! I i IL

21 I7 21

I.0 2 28 33 48 41 33 20 M Ii) “3: 25 :: _~_

2.0 4 2

I P ’ 3.2 6.4 ’ MS 187 89 1 68 90 85 1 68 35 M 33 51 69

HS 162, 77 59 85: 74 59 30 M 30 1 i 63 b155 44 54

I I ‘_ ! ---I---

8.0 / 160 MS 294 I40 107 109 55 HS 2% 122 93

154, j I34 134 ,116 93 50

1

12.0 MS369 176/134(193~168 134170 E 6$ 125 100 123 HS 319 152 I16 167 14.5 II6 60 IO8 a7 ; 107

. I

16.0 32 MS 4,5 198 ISI 217 189 I51 80 M76 6 , HS 360 17, I64 ,191 189 131 7U I M WI 6 1%

MS 465 221 169’ 243 !2ll I69 85 MRO 6 I57 127 I55 HS 404 193, 147 211 ’ 184 147 80 M7? 6 137 II0 I- I35

MS 520 2481 I89 272 236 HS 45, /2151 164 236 205

109 100 M !I0 6 176 142 174 164 85 M Ii0 6 153 I23 I51

-1 J 12 60 M 100 : t:: 15s 191

M SO 131 162,

1

IO 70 MS 516 293 224 323 ‘280 224 I20 M II0 208 HS 533 254 19) 279 242 I94 II0 M I00 : I80 14 :z

I

i -

MS I9 I6 I4 HS 16 I4 :: t: 12 ; : -.

MS 27 23 II HS 23 20 ; ;: t: IO :

______~_

MS 132’ II3 1 227 / 94 1 94 HS 1151 98 ! 197 1 82 , 82 I I fz E

MS 157 I34 HS I36 116

BALL Branmom TO Is:2513;1%3~

45 1:

85 40 78 ;: 4---H- 55 i3 105 50 I3 95 z:

*C&&&g formule for C:

ForMS--C=267?.+IP

PorHS--C=29,174/P

+ hfacbincd shank diameter ( Min ).

*Su IS: 4218-1967 ‘IS0 metric screw threads’.

( Boundary dimensions of rolling bearings fur general engineering purpora.

I: MS - Mild steel.

q HS - High trmile ttccl

12

ISi3815.ls.s9

‘.

TABLE S DIMBNSIONS FOR SPEUAL TRAPEZOW!4L SECTION POINT HOOKS WITH SHANK

[Ckuas 0.7, 3.2, 5.1(c), 5.1.1, 5.2.2, 8.2 and 11.21

All dimensions in millimctres.

Nola - Undercut according to IS : 1969-1961 ‘ Dimensions of screw thread run ouu and undercuts’.

-_--.___

BODEF

l Calculating formulc for C:

Forh4S--C!~32S9+/~-

For HS - C E 27.69 r/p

+ Machined shank diimclu ( Min ).

2 So IS :4210-1967 ’ IS0 metric screw Brtab’.

4 lbundary dimenrionr‘of rolling bearing far general cngioaing purpaa.

[ MS - Mild steel.

7 HS - High tensile steel.

*

13 .

AMENDlkI@NT NO. 1 DECEMBER 1970 -TO

IS : 381511969 SPECIFICATION FOR POINT HOOKS WITH SHANK FOR GENERAL ENGINEERING

PURPOSES

Gdrigendnrn

( Page 7, clause 8.2, first scntmce ) - Substitute the foliowing for the ekisting sentence:

‘ After heat treatment, the finished hooks shall be subjecled to the proof load given in Tables 1, 2 and 3. ’

(EDC 49) Printed at Swma Offset Press. Delhi

c

3815

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