Collection: Tensilock Bolts

Tensilock bolts are hex flange bolts with serrations on the underside of the flange. The serrations bite into the mating surface and resist loosening from vibration, and the wide flange spreads the load, so no separate washer is needed.

The serrations mark the surface they bear on, so avoid them on painted or soft finishes where that matters.

Pair them with Tensilock Nuts. For a bolt threaded right up to the head, see Tensilock Set Screws.