Specifications
- Head: flat (countersunk), 6 lobe (TORX®) drive
- Sizes: 1/4-20, 5/16-18, 3/8-16
- Lengths: 1" to 3-1/2" depending on size
- Thread: Type F thread cutting, machine screw pitch
- Material: heat treated steel, black phosphate
Common Uses
- Truck trailer and van floors
- Flatbed decking
- Wood to steel cross members
FAQ
What size pilot hole do I drill?
7/32" for 1/4-20 (T30 bit), 17/64" for 5/16-18 (T40) and 21/64" for 3/8-16 (T40). Drill size can vary with the steel thickness.
Why not use wood screws for trailer floors?
A trailer floor screw cuts a machine thread into the steel cross member, which holds far better under vibration than a wood screw.
Related: Type F Thread Cutting Screws | Drive Bits | Phillips Wafer Head Self Drilling
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