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Steel Designers Manual - TheBestFriend.org

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This material is copyright - all rights reserved. Reproduced under licence from The <strong>Steel</strong> Construction Institute on 12/2/2007<br />

To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.<strong>org</strong>/<br />

<strong>Steel</strong> <strong>Designers</strong>' <strong>Manual</strong> - 6th Edition (2003)<br />

1240 Bolt data<br />

Back marks in channel flanges<br />

RSC Nominal flange Back Edge Recommended<br />

width mark dist. diameter<br />

(mm) (mm) (mm) (mm)<br />

Back marks in angles<br />

102 55 47 24<br />

89 55 34 20<br />

76 45 31 20<br />

64 35 29 16<br />

51 30 21 10<br />

38 22 – –<br />

Nominal S1 S2 S3 S4 S5 S6 Nominal S1<br />

leg (mm) (mm) (mm) (mm) (mm) (mm) leg (mm)<br />

(mm) (mm)<br />

250 75 45 (20)<br />

200 75 (30) 75 (30) 55 (20) 55 (20) 55 (20) 70 40 (20)<br />

150 55 (20) 55 (20) 65 35 (20)<br />

125 45 (20) 50 (20) 60 35 (16)<br />

120 45 (16) 50 (16) 50 28 (12)<br />

100 55 (24) 45 25<br />

90 50 (24) 40 23<br />

80 45 (20) 30 20<br />

25 15<br />

Maximum recommended bolt sizes are given in brackets<br />

This table is reproduced from BCSA Publication No. 5/79, Metric Practice for Structural <strong>Steel</strong>works, 3rd edn,<br />

1979.

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