5/8"‑18 Grade 5 Hex Jam Nut – Fine Thread, Plain Finish

The 5/8"‑18 hex jam nut is manufactured from Grade 5 carbon steel to provide dependable strength and durability for precision fastening applications. Featuring a fine 18‑TPI thread and a thin jam‑nut profile, it is designed for use as a locking nut against a standard hex nut or in space‑restricted assemblies where finer thread engagement and improved resistance to loosening are required. Supplied in a plain (uncoated) finish, this jam nut is ideal for machinery, automotive, maintenance, and general industrial applications requiring secure locking and accurate adjustment.