Review on 🔩 Te-Co 41406T Black Oxide 1018 Steel Tapped T-Slot Nut, 3/8"-16 TPI, 5/8" Height x 7/8" Width x 9/16" Table Slot (Pack of 5) by Gary Hall

Well if you use them in a bed rail you will soon notice rust and then you will probably spend hours examining the metal to check learning that 1018 steel with a black oxide coating (which scrapes off the first time it is screwed in) is not what you need for automotive applications, and you save yourself the tedium of being a half-day metallurgist by simply buying stainless steel screws from the start. Rust aside, they are solid and fit well on the trail.