Trailer deck screws that sit flush and hold tight.
Flat head TORX® Type F trailer flooring screws cut their own machine thread in the steel cross member, so your wood deck stays put mile after mile. 1/4-20, 5/16-18 and 3/8-16 in stock.
Shop trailer flooring screwsHow to install ↓The 5/16-18 sizes most trailer decks call for
The go-to sizes for wood decks on flatbed, utility and van trailers. T40 TORX® drive, 17/64" pilot drill.
Made to fasten wood decking to steel
Trailer flooring screws come in longer lengths than standard Type F screws, so they pass through thick decking and still bite into the steel cross member below.
Type F thread cutting point
Blunt, tapered point with multiple cutting edges cuts its own machine-screw thread in the steel cross member.
Sits flush with the deck
80–82° flat countersunk head. Nothing to snag freight, forklifts or pallet jacks.
TORX® (6-lobe) drive
Deep recess takes high torque without cam-out or stripping.
Heat treated steel
Case hardened to Rockwell C45 min. so the threads cut cleanly. Black phosphate & oil finish.
Four steps to a flush, tight trailer deck
Drill one pilot hole through the wood and the steel, then drive the screw with a TORX® bit. The Type F point cuts the thread for you. No nuts, no welding, and you only need to reach the deck from the top.
How long a screw do I need?
Length is measured overall, from the top of the flat head to the end of the point. If you're between sizes, go one size longer so the tapered point fully clears the steel.
Trailer flooring screw size chart
Flat head, 6-lobe (TORX®) drive, Type F thread cutting, heat treated steel, black phosphate & oil.
| Thread | Length | TORX® bit | Pilot drill | SKU | |
|---|---|---|---|---|---|
| 1/4-20 | 1" | T30 | 7/32" | TRXF14201 | Shop |
| 1/4-20 | 1-1/4" | T30 | 7/32" | TRXF1420114 | Shop |
| 1/4-20 | 1-1/2" | T30 | 7/32" | TRXF1420112 | Shop |
| 1/4-20 | 2" | T30 | 7/32" | TRXF14202 | Shop |
| 1/4-20 | 2-1/2" | T30 | 7/32" | TRXF1420212 | Shop |
| 1/4-20 | 3" | T30 | 7/32" | TRXF14203 | Shop |
| 1/4-20 | 3-1/2" | T30 | 7/32" | TRXF1420312 | Shop |
| 5/16-18 | 1-1/2" | T40 | 17/64" | TRXF51618112 | Shop |
| 5/16-18 | 2" Popular | T40 | 17/64" | TRXF516182 | Shop |
| 5/16-18 | 2-1/2" Popular | T40 | 17/64" | TRXF51618212 | Shop |
| 5/16-18 | 3" Popular | T40 | 17/64" | TRXF516183 | Shop |
| 5/16-18 | 3-1/2" | T40 | 17/64" | TRXF51618312 | Shop |
| 3/8-16 | 2" | T40 | 21/64" | TRXF38162 | Shop |
| 3/8-16 | 2-1/2" | T40 | 21/64" | TRXF3816212 | Shop |
| 3/8-16 | 3" | T40 | 21/64" | TRXF38163 | Shop |
Trailer flooring screw questions
How long a screw do I need?
Add the deck thickness and the steel thickness, then leave enough extra length for the tapered point to pass fully through the steel. Length is measured overall, from the top of the head to the end of the point.
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 through the decking and the steel. The right size can vary with the steel thickness.
Why not use wood screws or lag screws?
A trailer flooring screw cuts a machine thread into the steel cross member. A UNC machine thread holds strong and resists vibration in steel, where a wood thread cannot.
What steel can they tap?
For best results the steel being tapped should be at least 10–20 Rockwell points softer than the screw (C45 min. surface hardness).
Do you offer volume pricing?
Yes. Quantity discounts are applied automatically in the cart, up to 25% off on larger quantities. Orders over $100 ship free (except where noted).
Need a size, finish or quantity you don't see?
Call 203.877.1709 or email sales@nutty.com. Purchase orders are accepted from government agencies, schools, hospitals, municipalities and companies with established credit.
Shop trailer flooring screws*Free shipping on orders over $100, except where noted.