Should high-strength structural bolting assemblies for preloading be assembled with lubrication?

According to standard requirements, during assembly, you should not use any additional lubrication apart from that originally supplied.

BS EN 14399 standard is leaving a clause, that additional lubrication should be used if it is subject to supplier recommendation.

Andrews Fasteners BS EN 14399 Assemblies are supplied to k-Class k0 and are offered pre-lubricated.

We are supplying lubricated parts of the assembly. Lubricated parts are used where due to surface coating, maximum tension needs to be controlled to prevent seizure.

On assemblies as per BS EN 14399, k-Class K1 and K2 additional lubrication would modify the values of km and invalidate the BS EN 14399-2 test results. In that situation, additional lubrication shall not be used.

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