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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 />

1236 Bolt data<br />

Bolt data<br />

Hole sizes – for ordinary bolts and friction grip connections<br />

Nominal Clearance Oversize Short slotted Long slotted<br />

diameter hole hole holes a holes a<br />

(mm) diameter b diameter a (mm) (mm)<br />

(mm) (mm)<br />

Narrow Slot Narrow Maximum<br />

dimension dimension dimension dimension<br />

M12 a 14 17 14 18 14 30<br />

M16 18 21 18 22 18 40<br />

M20 22 25 22 26 22 50<br />

M22 24 27 24 28 24 55<br />

M24 26 30 26 32 26 60<br />

M27 30 35 30 37 30 67<br />

M30 33 38 33 40 33 75<br />

a Hardened washers to be used<br />

b In cases where there are more than three plies in joint the holes in the inner plies should be one millimetre<br />

larger than those in the outer plies<br />

Bolt strengths<br />

Bolt grade <strong>Steel</strong> grade<br />

4.6 8.8 S275 S355 S460<br />

Shear strength, ps (N/mm 2 ) 160 375<br />

Bearing strength, pbb (N/mm 2 ) 460 1000 a 460 550 670<br />

Tension strength, pt (N/mm 2 ) 240 560<br />

a The bearing value of the connected part is critical

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