Nylon Insert Lock Nut

A nylon insert lock nut is a prevailing-torque hex nut whose non-metallic insert interferes with the mating thread. It is selected for removable joints that need resistance to loosening from vibration or handling. Buyers should specify thread, nut style, property class, insert material, service temperature, coating and reuse policy. Standards listed here govern particular forms and do not make sizes, materials or finishes interchangeable. The RFQ should state the exact standard or drawing, required configuration, quantity and inspection evidence. This product is a component used in fabricated metal product manufacturing. The nut body is typically steel or stainless steel, and the locking insert is a non-metallic material. The working principle relies on elastic deformation of the insert by the mating thread, generating prevailing torque before clamp load develops. This torque resists loosening under vibration or handling. For proper selection, confirm the applicable standard, nominal size range, material, strength/performance class, surface finish, and other RFQ fields against the chosen standard and supplier evidence. Always verify model-specific values and standards with the legal manufacturer or supplier. The listed standard ISO 7040:2025 is a procurement reference and does not imply certification or compliance of any specific product. The product is not manufactured or sold by the directory; it is a neutral listing. For maintenance, inspect for wear or damage to the insert, and follow the reuse policy. Failure boundaries include loss of prevailing torque due to insert wear or temperature limits. Ensure the nut property class matches the mating fastener. The RFQ should include all necessary details for verification.

The mating thread elastically deforms the insert, producing prevailing torque before clamp load is developed. This torque provides resistance to loosening from vibration or handling. The insert acts as a friction element that increases the torque required to turn the nut. The effect is present even when the nut is not fully seated, hence the term prevailing torque. The amount of prevailing torque depends on the insert material, thread dimensions, and nut style. Over time, the insert may take a set or wear, reducing its effectiveness. Therefore, reuse policy is an important consideration. The principle is distinct from free-spinning lock nuts that rely on deformation of the nut itself. The insert is typically a nylon or similar polymer, but the exact material must be specified. The operating temperature range is limited by the insert material. The design allows for removable joints, but the locking feature may degrade with repeated use. Always verify the specific performance characteristics with the manufacturer.