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Cooper and Turner are widely acknowledged as one of the UK's leading authorities on structural bolting and as such are uniquely placed to answer your queries.
This page attempts to provide straight forward information that will answer some of the most frequently encountered questions.
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Whilst this website and the information it contains are provided in good faith, no member of the Andaray group of companies shall be under any liability in respect of the contents of this website or for any reliance the user may place on it.
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Torques for Structural Bolting
Q: What tightening torques should be used for structural bolting?
We can confirm categorically that there are no installation torques for structural bolts / setscrews. The only reason for torque tightening structural bolts / setscrews would be to preload them, however, structural bolts / setscrews and nuts are not designed to be preloaded, if preloading is required then HSFG bolts should be used.
For confirmation of the fact that structural bolts / setscrews are not suitable for preloading, reference should be made to Table 2 of BS5950 Part 2 2001, where it will be found that property class / grade 4.6, 8.8 and 10.9 bolts are classed as ‘non-preloaded’ and that the only bolts suitable for preloading are HSFG.
Structural bolts / setscrews should be tightened strictly in accordance with the BCSA and SCI recommendations, contained in the National Structural Steelwork Specification for Building Construction, 4th Edition section 6.1.8 Bolt Tightening which states ‘ Bolts may be assembled using power tools or shall be fully tightened by hand using spanners in accordance with BS2583’
BS2583 is the specification for podger spanners.
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