5/16"‑18 Grade 5 Hex Jam Nut – Coarse Thread, Plain Finish

The 5/16"‑18 hex jam nut is manufactured from Grade 5 carbon steel for reliable strength and durability in general‑purpose fastening applications. Featuring a coarse 18‑TPI thread and a thin jam‑nut profile, it is designed to be used in combination with a standard hex nut or in space‑restricted assemblies to help prevent loosening. Supplied in a plain (uncoated) finish, this jam nut is well suited for machinery, automotive, maintenance, and industrial applications requiring secure locking and dependable performance.