Hales Yeah Trailer Deck Screws 5/16-18 x 2-1/2 in, 100-Pack — Flathead T40 Torx, Self-Tapping Wood to Metal Floorboard Screw, Type F Thread Cutting, Carbon Steel, Enclosed Trailer, Utility Trailer

Type F thread-cutting tip cuts threads into steel cross-members through a 9/32 in. pilot hole — no separate tapping step; oil phosphate coating lubricates on contact to reduce drive effort and extend bit life during high-volume floorboard screw installation. Compatible with flatbed, drop-deck, curtain-side, dry van, enclosed, utility, gooseneck, and horse/livestock trailers; suitable for apitong, hardwood, and softwood deck boards fastened to steel cross-member and C-channel frames. Flathead profile sits flush with the deck surface — no raised head to snag straps, tarps, or pallet runners during cargo loading and unloading; critical for flatbed and enclosed trailer floor installations. Case-hardened carbon steel per SAE J933 — HRC 45 minimum surface hardness, 306 lb-in minimum torsional strength; black phosphate and oil finish for corrosion resistance; fully threaded UNC 5/16-18 right-hand shank for maximum holding strength in wood-to-metal trailer frame connections. 100-piece pack of trailer decking screws; T40 six-lobe Torx drive (T-40 bit required — not T-30) delivers higher torque transfer and lower cam-out rate than hex or Phillips — reduces bit wear and strip-out risk during production trailer floor screw installation