Source: https://de.scribd.com/document/178356906/IS-10238
Timestamp: 2020-08-05 03:02:43
Document Index: 83667189

Matched Legal Cases: ['art 2', 'art 9', 'art13', 'art 17', 'art18', 'art 1', 'art2', 'art 3', 'art4', 'art 2', 'art 3', 'art 9', 'art 13', 'art 17', 'art 3', 'art 18']

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FASTENERS — THREADED STEEL
— STEP BOLTS FOR STEEL
STRUCTURES — SPECIFICATION
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’.
or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with
‘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.
1.1 This standard covers the requirements for step 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.
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:
Technical supply conditions for threaded steel fasteners:
(Part 2): 1979
1991 Mechanical
methods for bolts, screws and studs with full loadability (third revision)
(Part 9/Sec2):
Surface discountinuties: Section 2
ISO 6157–3 :
Bolts, screws and studs for special applications (third revision)
(Part13):
1983 Hot-dip galvanized coatings on
(Part 17): 1996 Inspection, smapling and acceptance procedure (third revision)
(Part18): 1996 P~ackrtging (third revision)
1369:1982
Dimensions of screw thread run-outs
2016:1967
and undercuts (second revision) Plain washers (first revision)
Part 1:2001
Basic profile (second revision)
1S0 68-1:1998
Part2 :2001
General plan (second revision)
1S0 261:1998
Part 3:1999
Basic dimensions (second revision)
1S0 724:1993
Part4 :2001
Selected sizes for screws, bolts and
1S0 262:1998
nuts (second revision)
4759:1996
Hot-dip zinc coating on structural steel and other allied products (third revision)
14394:1996 Industrial fasteners-Hexagon nuts
of product grade C— Hot-dip gal-
vanized—Sepcification
M 12 to M 36)
(size range
The dimensions and tolerances for step bolts shall be as given in Fig. 1.
The step bolts shall be of product Grade C as specified in IS 1367 (Part 2).
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.
6.2.1 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.
AL LOWED
175*4’
~16-6g
TO IS 4216 PITCH OF THREAD P=2mm
2X45’CHAMFERQ
(Si#lcu
A t5 . f-.l- ROLLED
Alldimensionsin millimetres.
‘x’ according to IS 1369
1 DIMENSIONSFORSTEPBOLT
The permissible surface discontinuities of the step bolts shall conform to IS 1367(Part 9/See 2).
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.
0.5 percent concentrated sulphunc acid maintained at a temperature more than 32°C to provide protection against wetstorage strain.
9 SAMPLING,
The sampling, inspection and acceptance criteria shall be in accordance with IS 1367 (Part 17).
The plain washers supplied alongwith the step
The step bolts shall not have any permanent set
when subjected to the cantilever test as shown in
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
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.
72 PLAIN
1S:2016
NUT TIGHTENED UP TO END OF BOLT THREAD
Alldimensionsin millimetre.s. FIG. 2 CANTILEVERTEST
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.
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.
A step bolt of size M16 and length 175 mm with two hexagon nuts shall be designated as:
Step Bolt M16 x 175 NN IS 10238
accordance with the IS 1367(Part 3).
12.2 BIS Certification
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.
The packaging of step bolts shall be in accordance with IS 1367 (Part 18).
No part of these publications
of BIS. This does not preclude the free use, in the course of
such as symbols
and sizes, type or grade
This Indian Standard has been developed from Doc : No.
BP 33 (0092).
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