The Definitive Guide for F1852-14 Standard Specification for “Twist Off” Type Tension

are now the most popular choice in high-strength structural bolting and formally recognized by the AISC (American Institute of Steel Building And Construction) and the RCSC (Research Council on Structural Links) as an approved setup method. A Stress Control Bolts consists of 1 bolt, 1 nut and 1 washer, pre-assembled and there for they are shown, 1 lot number, on the accreditation documents.

They are set up with a specialized electric shear wrench that has an outer socket that turns the nut counterclockwise, while grabbing the spline with the inner socket turning it clockwise. When the proper stress level has been accomplished the spline snaps off offering you a visual indicator of appropriate installation.

A325 Tension Control Bolt Assembly - Abrafast

Tension Control Bolts, Twist Off Bolts, A325 & A490 - Haydon Bolts  IncHaydon Bolts

All about Tension Control Bolts 20071903_1 - InStock Fasteners

Because of this exclusive lubrication, it is allowable to re-lubricated TC bolts, in the field, just the manufacture of a TC bolt can re-lubricate a TC assembly. Type-1, Type-3 & Mechanical Galvanized Bolts are sometimes detailed with names such as A325 HS, A325 SC, A325 X or A490 N.  The Most Complete Run-Down  relate to connection style and bolt setup, however do not alter the production requirements and are ideally disappointed on bolt orders.