is 4695.2.2003- knuckle thread.pdf

8/12/2019 IS 4695.2.2003- KNUCKLE THREAD.pdf

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Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to

information for citizens to secure access to information under the control of public authorities,in order to promote transparency and accountability in the working of every public authority,

and whereas the attached publication of the Bureau of Indian Standards is of particular interest

to the public, particularly disadvantaged communities and those engaged in the pursuit of

education and knowledge, the attached public safety standard is made available to promote the

timely dissemination of this information in an accurate manner to the public.

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!"# $ %& #' (")* &" +#,-.Satyanarayan Gangaram Pitroda

Invent a New India Using Knowledge

/0)"1 &2 324 #' 5 *)6Jawaharlal Nehru

Step Out From the Old to the New

7"#1&"8+9&"), 7:1&"8+9&")Mazdoor Kisan Shakti Sangathan

The Right to Information, The Right to Live

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IS 4695 (Part 2) :2003WR vmmWm-Fw mdra-wmm

m2 fare=@@

w .gg?mIndian Standard

GENERAL PURPOSE KNUCKLE

mTHREADS

PART 2 DEVIATIONS AND TOLERANCESSecond Revision

ICS 21.040.10

0 BIS 2003BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARGNEW DELHI 110002

December 2003 Price Group 4


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Engineering Standards Sectional Committee, BP 20

[OREWORDl-his 1ndian Standard (Part 2) (Second Revision) was adopted by the Bureau of Indian Standards, after the draftfinalized by the Engineering Standards Sectional Committee had been approved by the Basic and ProductionI,ngincering Division Council.l-his standard was first published in 1968 and subsequently revised in 1988. This revision has been taken up forupdating this standard incorporating the developments taken place in the field at international level.[n the preparation of this standard assistance has been derived from DIN 405-2:1997 General purposes knucklethreads -Part 2: Deviations and tolerances issued by the Deutsches Institut fur Normung (DIN).Ior the purpose of deciding whether a particular requirement of this standard is complied with, the final value,ohscrved or calculated, expressing the result of a test shall be rounded off in accordance with IS 2: 1960 Rules forrounding off numerical values (revi.seci). The number of significant places retained in the rounded off valueshould be the same as that of the specified value in this standard. ,


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IS 4695. Part 2 :2003

Indian StandardGENERAL PURPOSE KNUCKLE THREADS

PART 2

1 SCOPE

DEVIATIONS AND TOLERANCESSecond Revision

This standard covers the deviation and tolerances for knuckle screw threads.2 REFERENCESThe following standards contain provisions which through reference in this text, constitute provisions of thisstandard. At the time of publication, the editions indicated were valid. All standarck are subject to revision, andparties to agreements based on this standard are encouraged to investigate the possibility of applying the mostrecent editions of the standards indicated below:

[S No. Title1076 Preferred numbers:(Part 1) :1985 Series of preferred numbers (second revision)(Part 2): 1985 Guide to the use of preferred numbers (second revision(Part 3) :1985 Guide to the choice of series of preferred numbers and series containing more rounded

value of preferred numbers (second revision4695 (Part 1) :2003 General purpose knuckle screw threads: Part 1 Profile and nominal sizes secondrevision3 SYMBOLS AND TERMINOLOGYFor the purpose of this standard, the symbols and terminology as given in Table 1 of IS 4695 (Part 1) shall apply.4 DESIGNATIONA complete designation of knuckle screw threads comprises a size designation and tolerance class designation.4.1 The size designation of knuckle screw threads is specified in IS 4695 (Part 1).4.2 The tolerance class designation of knuckle screw threads comprises a class designation for pitch diametertolerance followed by a class designation for the crest diameter tolerance. Each class designation shall consist ofthe following:

a) A figure indicating tolerance grade; andb) A letter indicating tolerance position, capital for nuts, small for bolts.

[f the two class designations for a thread are equal, it is not necessary to repeat the symbol.4.2.1 Example for Nut Thread

Thread size designation as specified Rd40 x 4.233in IS 4695 (Part 1)Class designation for pitchdiameter tolerance ~~ HClass designation for crest (minor)diameter tolerance


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IS 4695 Part 2 :20034.2.2 Exumplefior Bolt T}zread

Thread size designation as specified Rd40 x 4.233 7h 6hin 1S 4695 (Part 1)Class designation for pitchdiameter toleranceClass designation for majordiameter tolerance

&2.3 E.rumple of Fits Between the Threaded PartsRd40 Y 4.233 7H/ 7eRd40 K4.233 7H/ 7h 6h

5 TOLERANCE GRADESThe tolerance grades for major, pitch and minor diameters shall be as given below:

Symbol Diameters ToleranceGrades

D, Minor diameter of nut thread 6 7d Major diameter of bolt thread 6 7d, Minor diameter of bolt thread 7 8Dz Pitch diameter of nut thread 7 8dz Pitch diameter of bolt thread 61), 7 8

1)This tolerance grade isonly needed for calculating the pitchdiameter tolerance. T,I of tolerance Grades 7 and 8,6 TOLERANCE POSITIONSThe tolerance positions for nut and bolt threads shall be as given at 6.1,6.2 and 6.3.6.1 Nut ThreadsTolerance position, H with basic allowance, El = O see Fig. 1),6.2 Bolt ThreadsTolerance position, h with basic allowance, es = O (see Fig. 2) and tolerance position, e with negative basicallowance, es (see Fig. 3).6.3 The basic allowances of the bolt thread shall be as given below:

Lead P External Threads Internal Threadsmm d,, dz, d, Dz, D,

Tolerance Position es Tolerance Position EZe h H

pm ~m1,54 78 o 03.175 85 o 04.233 97 o 06.35 120 o 0

2


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IS 4695 Part 2 :2003

EFIG . 1 NUTTIIIWADWIHB ASI CALLOWANCE ,EI = O

TOLLRANCXOSITION,H

7 LENGTH OF THREAD ENGAGEMENT[he length of thread engagement are divided into two groups N (normal) and L (long) as given below:r.. Nominal ThreadDiameter, drvermm712Z38-

71100150

up tomm

12203872

100150200

Lead Pmm

2.543.1753.1754.2334,2336.3506.350..

Length of Thread Engagement forN

From up tomm mm9 25

12 3513 3920 5922 6736 10729 116

LOvermm

2535395967

107116


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1S 4695 Part 2 :20038 TOLERANCE ON MAJOR AND MINOR DIAMETERS8.1 Minor Diameter Tolerance, Ti for Nut ThreadsThe tolerance on minor diameter tolerance, To, for nut threads shall be as specified below:

T

Lead, P Tolerance Gradesmm 6 7pm pm2.54 4s0 5603.175 530 6704.233 630 8006.350 850 1060

8.2 Major Diameter Tolerances for Nut ThreadsFor this diameter no tolerance has been specified.8.3 Minor Diameter Tolerance, ~d for Bolt ThreadsThe tolerance on minor diameter tolerance, Td,for bolt threads shall be as specified below:

Nominal Thread Lead, P TdzDiameter, d mm Tolerance Grades

Over up to 7 8mm mm pm pm7 12 2.54 250 315

12 I 38 I 3.175 I 300 37538 100 I 4.233 375 I 475100 200 6.350 500 630BASIC es

NOMINAL SIZETzr 0s2IFIG.2 130LTTHREADwrrHBMJCALLOWANCE,es = IzilFIG.3 BOLTTHREADWITHNEGATIVEBASICALLOWANCE,es


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IS 4695 Part 2 :20038.4 Major Diameter Tolerance, Td for Bolt ThreadsThe tolerance on major diameter tolerance, Tdfor bolt threads shall be as specified below:

T~Lead P Tolerance Grades

mm 6 7pm pm2.54 335 4253.175 375 4754.233 475 6006.350 630 800

9 PITCH DIAMETER TOLERANCES9.1 Pitch Diameter Tolerance, Tdzfor Bolt ThreadsThe pitch diameter tolerance, Tdzfor bolt threads shall be as specified below:

Nominal Thread Lead, P T~2Diameter, d mm Tolerance Grades

Over up to 6 7 8mm mm pm pm ~m7 12 2.54 160 200 250

12 38 3.175 190 236 30038 100 4.233 236 300 375

100 200 6.350 315 400 500

9.2 Pitch Diameter Tolerance, T for Nut ThreadsThe pitch diameter tolerance, T~z for nut threads shall be as specified below:

Nominal Thread Leadj P TD2Diameter, d mm Tolerance Grades

Over up to 7 8mm mm ~m pm

7 12 2.54 265 33512 38 3.175 315 40038 100 4.233 400 500

100 200 6.350 530 67010 RECOMMENDED TOLERANCE ZONE10.1 In order to reduce the number of gauges and tools, only the tolerance zones specified in 10.1.1 to 10.1.4 shallbe adopted.1f the length of thread engagement is unknown, thread engagement group N is recommended.To avoid confusions with previous tools, threading tools and gauges shall always be provided with the relevanttolerance zone.


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IS 4695 (Part 2) :200310.1.1 Tolerances Zones for Pitch Diameter of Nut ThreadsThe tolerances zones for pitch diameter, Dz of nut threads shall be as specified below:

Tolerances Zones for Pitch Diameter /For Thread Engagement GroupIN L7H 8H

10.1.2 Tolerances Zones for Pitch Diameter of Bolt Thr


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IS 4695 Part 2 :200311 FORMLJLAE11.1 Lengths of Thread EngagementThe lengths of thread engagement have been calculated according to the following formulae:

where d is the smallest nominal thread diameterwithin a series of nominal thread diametersaccording to 5.

11.2 Tolerances on Minor Diameter11.2.1 Tolerances on Minor Diameter of Grade 6 Nut Thread, TDIThese tolerances have been calculated according to the following formula:

TD (6)= 230 P07where TDI is, in ~m, and P is, in mm.The Grade 7 tolerances, TDI have been achieved by multiplying the tolerances on the minor diameter of theGrade 6 nut thread by the factor 1.25.11.2.2 Tolerances on A4irlor Diameter of Bolt Thread, T~3The tolerances on the minor diameter, Tdl have been calculated from the following formula:

TdJ= 1.25 Tdzwhere T~2and Td, are in um see Tdzvalues from 9.1 .11.3 Tolerances on Major Diameter of Grade 6 Bolt Threads, Td

These tolerances have been calculated according to the following formula:

[13.15Td (6) = 180 Pz 3 +

where Td is, in pm and P is, in mm.The Grade 7 tolerances, Td have been achieved by multiplying the tolerances on the major diameter of theGrade 6 bolt thread by the factor 1.25.1 .4 Tolerances on Pitch Diameter1I.4.1 Tokrances on Pitch Diameter of Grade 6 Bolt Threads, T~2These tolerances have been calculated according to the following formula, where dis equal to the geometric meanofthe diameters:

Td2(6)=90p04.d01where Td2is, in pm, and P and dare, in mm.The tolerances on pitch diameter, Tdzfor other tolerance grades havebeen achieved by multiplying the toleranceson pitch diameter of Grade 6 bolt threads by the factors given below:

Factor for Tdzof Bolt ThreadsTolerance Grade 7 8Factor 1.25 1.6

7


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IS 4695 (Part 2) :200311.4.2 Tolerances on Pitch Diameter of Nut Threads, T~lThe tolerances on pitch diameter, T~z have been achieved by multiplying the tolerances on pitch diameter forGrade 6 bolt threads, T~2by the factors given below:

Factor for TDZof Nut ThreadsI To[erance Grade 17]8]I Factor

11.5 Basic Allowances (es)~he basic allowance (es) for tolerance position, e = (50+ 11P ~m.11.6 Rounding RulesThe values for the tolerances on the major, pitch and minor diameters have been calculated from the formulaegiven above and then rounded to the nearest value of the R40 series according to IS 1076 (Part 1) to IS 1076(Part 3).12 MULTI-START KNUCKLE SCREW THREADS[n the case of multi-start knuckle screw threads, the pitch P (axial distance between two adjacent equidirectionalflanks) of the single-start knuckle screw thread has, instead of the lead P, P~ has been taken as the basis for:

a) Basic allowances, esb) Tolerances on minor diameter for nut threads, T~l; andc) Tolerances on m-ajor diameter for bolt threads, Zd(.

The tolerances on pitch diameter for nut threads, T~, and bolt threads, T~2of the multi-start thread of lead,P (axial displacement for one turn) are increased. For this purpose, the tolerance on pitch diameter for the single-start knuckle screw thread of pitch, P is taken as the basis. These tolerances are multiplied by a factor, correlatedto the number of threads from the R20 series according to 1S 1076 (Part 1) to IS 1076 (Part 3).If multi-start threads of large leads are produced, the tolerances, T~2and Toz which cannot be taken from 9.1and 9.2, the values for Tdzand T~z shall be calculated from the formulae given in 11.4.1 and 11.4.2.


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Bureau of Indian Standards[31S isastatutory institution established under the Bureau of Indian StandarA Act, 1986 to promote harmoniousdevelopment of the activities of standardization, marking and quality certification of goods and attending toconnected matters in the country.CopyrightB1S has the copyright of all its publications. No part of these publications may be reproduced in any formvithout the prior pe~ission in writing of B[S. This does not preclude the free use, in the course of implementingthe standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating tocopyright bc addressed to the Director (Publication), BIS.Review of Indian StandardsAmendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if tlw review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to-the latest issue ofEtlS Catalogue and Standards: Monthly Additions.This Indian Standard has been developed from Dot: No. BP 20 (0341).

Amendments Issued Since PublicationAmend No. Date of Issue Text Affected

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is 4695.2.2003- knuckle thread.pdf

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