Your cart is empty
Browse our catalog to find the parts you need.
These images are illustrative and may not match the product exactly. Always verify by part number — or confirm instantly with the assistant using a photo or VIN.

Knox Trailers · Hardware & Fasteners
1/4X4FB
In stock · ships from Knoxville
This is a 1/4 inch thick by 4 inch wide hot-rolled A36 steel flat bar, sold by the foot.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 4 applications
Add your truck to see whether it's one of them
All confirmed applications for this part number.
Other applications
Other applications
Raw material sold per foot; not vehicle-specific but widely used in trailer manufacturing and custom fabrication.
Part data verified against 5 catalog sources
Numbers this part supersedes or interchanges with. Showing 3 of 3.
Different year, make, or config? Get a confirmation against your truck in under a minute.
It's a versatile mild steel stock commonly used for fabrication, welding, and repair projects, including trailer frames, brackets, and supports. The bar has a rough scaled surface with slightly rounded edges typical of the hot rolling process, and it's easy to weld, cut, form, and machine. It's often purchased for trailer repairs, agricultural equipment, and general metalworking.
Part Number: 1/4X4FB
STEEL FLAT BAR, PER FT
Unit: ea
Dealer: Knox Trailers
Compatibility, alternatives, and more