How Many Threads Per Inch Does the 2-1/2" Long Torx Trailer Floor and Wall Liner Screw Have?
Updated 09/08/2025 | Published 06/04/2025
Products Featured in This Question
Question:
On the product information page 2-1/2" Long Torx Trailer Floor and Wall Liner Screw for ACQ Treated Wood Part Number: TFX250ACQ the 2-1/2” 1/4” screws are said to have 21TPI, threads per inch. That’s a really unusual thread pitch. Is it actually 20 TPI, or is there a reason you do 21TPI?
asked by: Mike
Expert Reply:
Hey Mike. I checked with the manufacturer and the 2-1/2" Long Torx Trailer Floor and Wall Liner Screw for ACQ Treated Wood item # TFX250ACQ does have 21 threads per inch.
These screws are specially designed for use on Alkaline Copper Quaternary wood. They have a blunt tip so you'll want to drill a 7/32" pilot hole.
You'll need a TRX 30 bit to install them like our Torx Head Screwdriver Bit item # TX430-1.
Are you looking to replace screws in your trailer floors or are you swapping out the flooring entirely?
(click to enlarge)
Product Page this Question was Asked From
2-1/2" Long Torx Trailer Floor and Wall Liner Screw for ACQ Treated Wood
- Accessories and Parts
- Trailer Tie Down Anchors
- Hardware
- Torx Screw
- 2-1/2 Inch Long
- Redline
more information >
Continue Researching
- Search Results: deck screws
- Search Results: torx trailer screw
- Search Results: self tapping trailer deck screws for treated wood
- Search Results: torx screws
- Shop: 2-1/4" Long Torx Trailer Floor and Wall Liner Screw for ACQ Treated Wood
- Video: etrailer E-Track Backing Plates w/ Hardware Spec Review
- Video: Feature Breakdown: etrailer E-Track Backing Plates w/ Hardware
- Video: Redline Tie Down Anchors TFX225ACQ Review
- Q&A: Availability of Backing Plate for E-Track Wheel Chock
- Q&A: Recommendation For Screws To Attach Pressure Treated Decking To a Flat Trailer
- Q&A: Fasteners for Install of Erickson E-Track Wheel Chock
- Shop: 2-1/2" Long Torx Trailer Floor and Wall Liner Screw for ACQ Treated Wood
- Shop: etrailer E-Track Backing Plates w/ Hardware - Galvanized Steel - 6" Long x 6" Wide - Qty 4
- Shop: Erickson ATV E Track Tie-Down Kit w/ Ratchet Straps and Wheel Chocks - 1,500 lbs
- Shop: 2-1/2" Long Torx Floor Screws, 40/Pkg
- Shop: 2-1/2" Long Standard Torx Trailer Floor and Wall Liner Screw
- Shop: BTBRV Magnetic Hitch Receiver Reducer Sleeve - 2-1/2" to 2" - Red
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Shop: Trailer Hitch
- Article: Trailer Wiring Diagrams
- Search Results: trailer hitch
- Shop: Trailer Wiring
- Search Results: trailer tires and wheels
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Video: How to Choose a Trailer Brake Controller
- Article: How to Measure for Trailer Hitch Drop
- Shop: Suspension Enhancement
- Q&A: Does etrailer Carry Furrion Chill Cube w/ Heat Pump to Replace Dometic Duo-Therm
- Search Results: trailer wiring
on Accessories and Parts
Jerred H.
9/8/2025
Hey Mike, did you decide to use the 2-1/2" Torx screws for your trailer floors, or are you planning to replace the flooring completely? I'm curious to know how it worked out for you, as it could help others with similar projects.