1‑3/8"‑6 Grade 5 Hex Jam Nut – Coarse Thread, Plain Finish

The 1‑3/8"‑6 hex jam nut is manufactured from Grade 5 carbon steel to provide dependable strength and durability for heavy‑duty fastening applications. Featuring a coarse 6‑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 to help resist loosening under vibration. Supplied in a plain (uncoated) finish, this jam nut is well suited for machinery, structural, maintenance, and industrial applications requiring secure locking and reliable performance.