5/8"‑18 Grade 5 Hex Jam Nut – Fine Thread, Zinc CR+3 Finish

The 5/8"‑18 hex jam nut is manufactured from Grade 5 carbon steel to provide dependable strength and durability in 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. Finished with a Zinc CR+3 coating for enhanced corrosion resistance, this jam nut is ideal for machinery, automotive, maintenance, and general industrial applications requiring secure locking and reliable long‑term performance.