Jam Nuts are thin, low-profile hex nuts—typically about half the height of standard hex nuts. They are often used in combination with regular hex nuts as a locking mechanism, where the jam nut is tightened against the standard nut to secure the assembly and prevent loosening under vibration or load. Commonly referred to as thin hex nuts, hex jam nuts, or jam lock nuts, they offer a compact solution for space-constrained applications.

Jam nuts are available in both metric and imperial sizes, supporting UNC (Unified National Coarse), UNF (Unified National Fine), UN (Unified National Fixed), and ISO metric thread standards. They are manufactured from a wide variety of materials and grades, in compliance with various ASTM specifications.

Explore this section for more details on the production methods, available dimensions, thread types, material options, weight and torque specifications, and industry standards for jam nuts.