Is two threads protruding through a pre-load fastener enough? - Andrews Fasteners CE Approved Bolts, Nuts & Washers

Andrews Fasteners Ltd

AndFast Malaysia SDN BHD

The Fasteners Specialist

0113 246 9992
+44 (0) 113 246 9992

Is two threads protruding through a pre-load fastener enough?

Overal recommendation is to have minimum 1 (one) thread above unloaded face of the nut, and minimum 4 (four) threads before shank of the bolt and the nut.

 

Please also refer to your Quality Document QCD 04 regarding to Bolt lengths (grip lengths) for preload fasteners.