Nylon Insert Lock Nut

Nylon insert lock nuts are hexagonal threaded fasteners that use a non-metallic polyamide collar to generate prevailing torque when installed on a mating bolt or screw. The nylon insert interferes with the external thread, creating resistance to rotation and helping reduce unintended loosening during service.

Also known as nylon lock nuts or prevailing torque lock nuts, these fasteners are available in different dimensions, nut profiles, materials, and surface finishes. Common metric designs include thin and regular-height hexagon nuts specified by applicable ISO or DIN standards.

Nylon insert lock nuts are used in machinery, vehicle components, electrical equipment, and general industrial assemblies. Selection depends on thread compatibility, mechanical requirements, installation space, operating temperature, and environmental exposure.

Prevailing Torque Locking: The nylon collar creates friction against the mating external thread, providing resistance to rotation independently of the clamping force at the bearing surface.

Compact Hexagonal Design: Hexagonal bodies accommodate standard wrench and socket tools. Different nut heights provide options for installation clearance and thread engagement.

Material Options: Carbon steel and stainless steel configurations serve different mechanical and environmental requirements. Material selection should match the applicable product standard and joint design.

Metric and Inch Threads: Metric coarse and fine threads, UNC, and UNF are common thread systems for industrial fasteners.

Defined Inspection Requirements: Dimensional checks, thread gauging, proof load testing, and prevailing torque testing can be specified according to the applicable product standard and purchase requirements.

Thread Size and Pitch: Match the nut to the bolt's nominal diameter, pitch, and thread system. Metric threads and inch-series threads are not interchangeable. Fine-thread applications require the correct matching pitch.

Nut Profile and Clearance: Select the nut height according to available space, bolt length, and required thread engagement. Check the dimensional drawing and applicable standard before ordering.

Material and Strength: Choose carbon steel or stainless steel according to mechanical loading and environmental exposure. The nut's mechanical properties must be compatible with the mating bolt and joint design.

Corrosion Resistance: Zinc-plated steel is commonly used for general indoor applications. Stainless steel grades such as A2 and A4 are options for selected corrosive environments. Actual corrosion resistance depends on the material, surface condition, exposure, and operating environment.

Temperature Compatibility: Nylon insert performance is affected by temperature and material characteristics. For applications involving elevated temperatures, confirm that the insert material is suitable for the required operating conditions. All-metal prevailing torque nuts may be more appropriate when a polymer insert cannot meet the application requirements.

Coating and Hydrogen Embrittlement: Electroplating high-strength steel fasteners can introduce hydrogen embrittlement risks. Applicable prevention measures and post-plating treatments must follow the relevant fastener and coating requirements.

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