HSFG bolt

From International Dictionary of Marine Aids to Navigation
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High strength friction grip bolt

High tensile bolt tightened to a high torque to join steelwork members together purely by friction, and not in shear or bending. The bolt is a loose clearance fit into its hole.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM