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Why these bolts are special

 

High-strength Property Class 8.8 structural bolts, nuts and washers are designed to be dependably tightened on installation to the extent that the bolt shank is plastically elongated. This generates a very large clamping force across the steel components gripped by the bolts (over 25 tonnes of clamping force per bolt for an M24 bolt). This ‘full tensioning’ allows the bolts to be used in a wide range of structural connections that provide the same rigidity as a welded connection under normal operating conditions. It also provides a very high resistance to fatigue fracture of bolts in connections subject to high cycle reversing loads.

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This information is published by the Ministry of Business, Innovation and Employment’s Chief Executive. It is a general guide only and, if used, does not relieve any person of the obligation to consider any matter to which the information relates according to the circumstances of the particular case. Expert advice may be required in specific circumstances. Where this information relates to assisting people: