5/8 Steel LH Jam Nut

The Diversified Machine 5/8 Steel Left-Hand Jam Nut (JAM10L) is a precision fastening component engineered for applications requiring secure, repeatable thread locking on left-hand threaded assemblies. This 5/8-18 left-hand jam nut features steel construction with zinc oxide plating, delivering corrosion resistance and reliable performance in demanding mechanical and industrial environments where standard right-hand fasteners are incompatible or where left-handed rotation is specified by design.

The 5/8-18 thread specification indicates a 5/8-inch major diameter with 18 threads per inch, a standard pitch common in precision machinery, firearms manufacturing, and mechanical assemblies. The left-hand thread design reverses the rotation direction, requiring counterclockwise tightening—essential for assemblies where left-handed threads prevent unintended loosening due to rotational forces or vibration. Steel construction combined with zinc oxide coating provides galvanic protection against surface corrosion while maintaining structural integrity under load. The jam nut's compact profile and minimal weight (0.02 lbs) make it suitable for space-constrained applications without adding measurable bulk to subassemblies.

This fastener is specified for precision mechanical systems—including rifle actions, suppressor mounts, scope bases, and custom machined assemblies—where left-hand threading prevents accidental or vibration-induced loosening. Machinists, gunsmiths, and mechanical engineers working with components requiring left-handed fastening depend on accurate thread pitch and corrosion-resistant materials. The Diversified Machine jam nut meets these demands with straightforward, verified specifications and industrial-grade construction for repeatable, reliable assembly.