M42‑4.50 DIN 439B Hex Jam Nut – Class 04, Coarse Thread, Plain Finish

M42‑4.50 hex jam nut manufactured to DIN 439B standards from Class 04 steel, providing reliable strength and dimensional accuracy for heavy‑duty metric fastening applications. Featuring a coarse 4.50 mm thread pitch 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 load and vibration. Supplied in a plain (uncoated) finish, this jam nut is ideal for machinery, structural steel, maintenance, and industrial applications requiring secure locking and dependable performance.