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है”ह”ह

IS 1369-1 (1993): Fasteners - Thread Run-Outs andUndercuts, Part 1: Dimensions for Screw Thread Run-Outs forExternal ISO Metric Threads [PGD 31: Bolts, Nuts andFasteners Accessories]

Is 1369( Part1 ): 1993 IS0 3506 : 1976

Indian Standard

FASTENERS - THREAD RUN-OUTS AND UNDER~CUTS

PART 1 DIMENSIONS FOR SCREW THREAD RUN-OUTS FOR EXTERNAL IS0 METRIC THREADS

( Third Revision )

UDC 621’882’082’1

@ BIS 1993

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

May 1993 Price Group 2

Bo Its, Nuts and Fasteners Accessories Sectional Committee, LM 14

NATIONAL FOREWORD

This Indian Standard ( Part 1 ) which is identical with IS0 3508 : 1976 ‘Thread run-outs for fasteners with thread in accordance with IS0 261 and IS0 262’, issued by the International Organization for Standardization ( IS0 ) was adopted by the Bureau of Indian Standards on the recommendations of the Bolts, Nuts and Fasteners Accessories Sectional Committee ( LM 14 ) and approval of the Light Mechanical Engineering Division Council.

When a threading operation is not performed throughout the length of the component, then due to the necessary throat angle or taper lead on the screwing tool, the last few threads cannot be perfectly formed. The length of these washout threads makes the thread run-out on the component.

The standard IS 1369 ‘Dimensions for screw thread runouts and undercuts’ was originally published in 1961 and subsequently revised in 1975 and 1982. The present revision has been taken up to harmonize it with the corresponding IS0 standards and is being published in three parts as follows:

IS 1369 ( Part 1 ) Dimensions for screw thread run-outs for external IS0 metric threads ( Adoption of IS0 3508 : 1976 )

IS 1369 ( Part 2 ) Dimensions for screw thead under-cuts for external IS0 metric threads ( Adoption of IS0 4755 : 1983 )

IS 1369 ( Part 3 ) Dimensions for thread run-outs and under-cuts for internal threads ( blind tapped holes ) ( under preparation )

The text of IS0 Standard has been approved as suitable for publication Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear, referring to this standard, they should be read as ‘Indian Standard’.

b) Comma ( , ) has been used as a decimal marker while in Indian Standards, the current practice is to use point ( . ) as the decimal marker.

In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their place are listed below along with their degree of equivalence for the editions indicated:

International Standard Corresponding Indian Standard Degree of Equivalence

IS0 261 : 1973”

IS0 262 : 1973”

IS 4218 ( Part 2 ) : 1976 IS0 metric screw threads : Part 2 Diameter pitch combinations ( first revision )

IS 12241 : 1987 IS0 general purpose metric screw threads - Selected sizes for screws, bolts and nuts

Technically equivalent

Identical

IS 1369 ( Part 1) : 1QQi IS0 3508 : 1978

lndibn Standard

FASTENERS - THREAD RUN-DO-UTS AND UNDERCUTS

PART 1 DIMENSIONS FOR SCREW THREAD RUN-OUTS FOR EXTERNAL IS0 METRIC THREADS

( Third Revision)

1 SCOPE AND FlELD OF APPLICATION

This International Standard specifies thread run-outs for fasteners with thread in accordance with IS0 261, /SO genera/ purpose metric screw threads - General plan, and with IS0 262, IS0 general purpose metric screw threads - Selected sizes for screws, bolts and nuts.

It does not apply to those threaded fastenerswhere special requirements are laid down in-the product standards.

IS 1389 ( Part 1) : 1993 IS0 3508 : t978

Ma&in@ thmad Rollad thmd

(shank diameter = thread diameter) (shank diameter * pitch diameter) (shank diameter = thread diameter)

b = thread length I = nominal length of the bo!t orscrew

Fully threadad ecraws - Distance of the last full form thread from the bearing area

2

IS 1369 ( Part 1) : 1993 IS0 3508 : 1976

Dimensions in millimetres

a

max.

NOTES

Run-out x normal for all types of screws in product grades A, B and C.

Run-out x short only in cases where a short run-out is required for technical reasons.

Distake a normal for all types of screws in product grade A.

Distance a long for all types of screws in product grades B and C.

‘3 Reprography Unit, BIS. New Delhi, India

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Revision of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodicalIy; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ‘BIS Handbook’ and ‘Standards Monthly Additions’. Comments on this Indian Standard may be sent BIS giving the following reference:

Dot : No. LM 14 ( 0135 )

Aendments Issued Since Publication

Amend No. Date of Issue Text Affected

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