Source: https://ru.scribd.com/document/178356906/IS-10238
Timestamp: 2019-07-22 22:44:22
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IS-10238 | Screw | Nut (Hardware)
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FASTENERS — THREADED STEEL FASTENERS — STEP BOLTS FOR STEEL STRUCTURES — SPECIFICATION
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IS 10238:2001
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FASTENERS THREADED STEEL FASTENERS STEP BOLTS FOR STEEL STRUCTURES SPECIFICATION
@ BIS 2001
Bolts, Nuts and Fasteners Accessories Sectional Committee, BP 33
FOREWORD This Indian Standard (First Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by the Bolts, Nuts and Fasteners Accessories Sectional Committee and had been approved by the Basic and Production Engineering Division Council. This standard was originally issued in 1982. Subsequent to the publication, three amendments have been issued. This revision has been taken up to incorporate these amendments as well as to make in line with the actual products which are being used by the electrical transmission and tower erection industries. Step bolts are used to gain access to the top of steel structures including transmission towers. For safety reasons, while gaining access to the top of the structure, with the help of step bolts, the maximum total weight of a person including the bolts, nuts, tools and tackles that he may carry with him, should not exceed 150 kg. Hexagon bolts intended for fabrication of general steel structures are covered in IS 6639 Hexagon bolts for steel structures. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2:1960 Rules for rounding off numerical values (revised). The number of significant places retained in the rounded off values should be the same as that of the specified value in this standard.
FASTENERS THREADED STEEL FASTENERS STEP BOLTS FOR STEEL STRUCTURES SPECIFICATION ( First Revision)
1 SCOPE 1.1 This standard covers the requirements for step
IS No. Part2 :2001 1S0 261:1998 Part 3:1999 1S0 724:1993 Part4 :2001 1S0 262:1998 4759:1996
Title General plan (second revision) Basic dimensions (second revision) Selected sizes for screws, bolts and nuts (second revision) Hot-dip zinc coating on structural steel and other allied products (third revision) Industrial fasteners-Hexagon nuts of product grade C Hot-dip galvanizedSepcification (size range M 12 to M 36)
bolt used in steel structures including transmission towers to gain access to the top. 1.2 Each bolt shall be supplied with two hexagon nuts. 2 REFERENCES The following standards contain provisions which through reference in this text, constitute provision of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below: IS No. 1367 Title
14394:1996
3 DIMENSIONS AND TOLERANCES The dimensions and tolerances for step bolts shall be as given in Fig. 1. 4 GRADES The step bolts shall be of product Grade C as specified in IS 1367 (Part 2). 5 MECHANICAL
Technical supply conditions for threaded steel fasteners: (Part 2): 1979 Product grades and tolerances (second revision) (Part 3): 1991 Mechanical properties and test methods for bolts, screws and studs with full loadability (third revision) (Part 9/Sec2): Surface discountinuties: Section 2 1993 Bolts, screws and studs for special ISO 61573 : applications (third revision) 1988 (Part13): 1983 Hot-dip galvanized coatings on threaded fasteners (second revision) (Part 17): 1996 Inspection, smapling and acceptance procedure (third revision) (Part18): 1996 P~ackrtging (third revision) 1369:1982 Dimensions of screw thread run-outs and undercuts (second revision) 2016:1967 Plain washers (first revision) 4218 1S0 general purpose metric screw threads: Part 1:2001 Basic profile (second revision) 1S0 68-1:1998
The step bolts shall conform to the requirements of property class 4.6 as specified in IS 1367(Part 3). 6 MATING NUTS AND WASHERS
The hexagon nuts used (see 1.2) with step bolts covered in this standard shall be of property class 5 and conforms to the requirements of IS 14394. 6.2 Washers
6.2.1 The plain washers used on these bolts shall be of Type A punched washers type and conform to the requirements given in IS 2016 except the thickness of washers which shall be 5 * 1 mm.
6.2.2 The washers supplied along with bolts shall be hot-dip galvanized and in accordance with 8.2. 1
~16-6g TWIS EDGE MAY BE ROUNDED. NO SHARP EDGE AL LOWED w t 1+2 035 THREAD P=2mm
TO IS 4216 PITCH OF THREAD 2X45CHAMFERQ OR At5 ROLLED . f-.l9 (Si#lcu
!{! x
!I 60+:
x according to IS 1369 1 DIMENSIONS FORSTEPBOLT 0.5 percent concentrated sulphunc acid maintained at a temperature more than 32C to provide protection against wetstorage strain. 9 SAMPLING, INSPECTION AND ACCEPTANCE CRITERIA The sampling, inspection and acceptance criteria shall be in accordance with IS 1367 (Part 17).
10 TESTS 10.1 The step bolts shall not have any permanent set when subjected to the cantilever test as shown in Fig. 2. 10.1.1 Before carrying out the cantilever test, the step bolt shall be loaded with 150 kg for 10 seconds with the set up shown in Fig. 2.
MEMBER PERMANENT SET TO BE MEASURED AT THIS POIN~ WIRE
The permissible surface discontinuities of the step bolts shall conform to IS 1367(Part 9/See 2). 8 FINISH 8.1 The step bolts shall be galvanized in accordance with IS 1367 (Part 13). All dimensions given in Fig. 1 shall apply before galvanizing. 8.2 The plain washers supplied alongwith the step bolts covered in this standard shall be hot-dip galvanized in accordance with the requirements of Is 4759. 8.3 Hot-dip galvanized bobs, nuts and washers shall be passivate by dipping, immediately after galvanizing in a 0.15 percent solution of sodium bichromate with
PLAIN WASHER AS PER 1S:2016
NUT TIGHTENED UP TO END OF BOLT THREAD DRILLED HOLE, 016
Alldimensionsin millimetre.s. FIG. 2 CANTILEVER TEST
The bolts then shall be loaded again with 150 kg load for 10 seconds and there shall be no permanent set at the point indicated, after withdrawal of the load subject to a tolerance of 30 p m for measurement error. Both these loadings shall be done after the step bolts and nuts are tightly fixed as shown in Fig. 2.
12 MARKING 12.1 The marking on the step bolts shall be accordance with the IS 1367(Part 3). 12.2 BIS Certification Marking
The step bolts shall be designated by the size, length and the number of this Indian Standard. The letter NN shall be added to the designation to indicate supply with two nuts. Example: A step bolt of size M16 and length 175 mm with two hexagon nuts shall be designated as: Step Bolt M16
The use of Standard Mark is governed by the provision of the Bureau of Indian Standards Act, 1986 and Rules and Regulations made thereunder. The details of conditions under which the Iicence for the use of the Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards. 13 PACKAGING The packaging of step bolts shall be in accordance with IS 1367 (Part 18).
175 NN IS 10238
is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country.
has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director (Publications), BIS.
Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; 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 Catalogue and Standards: Monthly Additions. This Indian Standard has been developed from Doc : No. BP 33 (0092).
BUREAU OF INDIAN STANDARDS Headquarters : Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telephones :3230131,3233375,323 9402 Regional Offices : Central Eastern Northern Southern Western Branches : Manak Bhavan, 9 Bahadur Shah Zafar Marg NEW DELHI 110002 : 1/14 C. I. T. Scheme VII M, V. I. P. Road, Kankurgachi CALCUTTA 700054 : SCO 335-336, Sector 34-A, CHANDIGARH 160022 : C. I. T. Campus, IV Cross Road, CHENNAI 600113 : Manakalaya, E9 MIDC, Marol, Andheri (East) MUMBAI 400093 Telegrams : Manaksanstha (Common to all offices) Telephone 3237617 { 3233841 3378499,3378561 { 3378626,3379120 603843 { 602025 2350216,2350442 { 2351519,2352315 8329295,8327858 { 8327891,8327892
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