M30‑3.50 DIN 439B Hex Jam Nut – Class 04, Coarse Thread, Plain Finish

The M30‑3.50 DIN 439B hex jam nut is a heavy‑duty, low‑profile locking nut designed for coarse‑thread metric fastening where secure locking and reduced nut height are required. Manufactured to DIN 439B specifications with a Class 04 strength rating, this jam nut is used in combination with a standard hex nut to prevent loosening caused by vibration or load movement. The 3.50 mm coarse thread pitch allows for quicker installation and dependable performance in general‑purpose industrial applications. Supplied in a plain (uncoated) steel finish, it is ideal for controlled environments, machinery assemblies, and secondary locking applications.