Trailer Deck Screws

Flat-head Type F trailer deck screws (also called floorboard screws) cut machine threads into steel trailer crossmembers. They are self-tapping thread-cutting screws: a blunt Type F point with tapered lead threads needs a pre-drilled pilot hole. They do not drill their own hole.

Every size on this page is a flat countersunk head with a 6-lobe drive, case-hardened carbon steel, and a black phosphate finish. Threads are UNC machine threads in #10-24, 1/4"-20, 5/16"-18, and 3/8"-16. Pick the diameter and length that matches your deck and steel, then buy by the contractor pack or the bulk box.

Pre-drill through the deck and the steel before you drive. An undersized hole can snap a hardened screw. Spec sheets are available on request.