What is jam nut?

A jam nut is a type of thin nut that is typically used as a secondary nut to secure a primary nut in place. They are commonly used in applications where vibration or movement may cause a nut to loosen over time.

Jam nuts are often used in automotive, machinery, and construction equipment to prevent bolts and other fasteners from coming loose. They are usually installed on the threaded end of a bolt and tightened against another nut to lock it in place.

Jam nuts are designed to be used in conjunction with a standard nut or bolt and are usually smaller in size to fit in tight spaces. They are typically made from steel, stainless steel, or brass, and are available in various sizes and thread pitches to accommodate different fastening needs.

Overall, jam nuts are a practical and cost-effective solution for preventing nuts and bolts from coming loose in high-vibration or critical applications.