1/4-20 (30 Pack) Stainless Steel Hex Locknuts, Nylon Insert Hexagon Lock Nuts US Standard, Stainless Steel 304 (18-8), UNC Coarse Thread, Black Coated

Also known as polymer-insert lock nut or elastic stop nut, nylon insert hex locknut is a kind of locknut with a nylon collar insert to resist turning and to prevent loosening under high pressure and torque. The 18-8 stainless steel have good chemical, rust and corrosion resistance making the nuts ideal use in fresh and salt water application. Application Ideal paired with externally threaded components like bolts and studs. Widly used in automobile, machinery, electronics, assembling, construction, manufacturing industry, indoor and outdoor.

• This package contains 30 pieces of 1/4-20 stainless steel hex lock nuts. Each nut features a nylon insert for reliable locking and a standard hex design for easy installation with wrenches or sockets
• Made from corrosion-resistant 304 (18-8) Stainless Steel and enhanced with a durable black coating, these lock nuts offer superior protection —ideal for both indoor and demanding outdoor applications
• Designed to prevent loosening under vibration. Perfect for automotive repairs, machinery assembly, DIY projects, furniture, trailers, and securing outdoor equipment. The nut is commonly used with matching bolts for a wide range of general fastening tasks
• The nylon collar provides consistent locking torque and can be reused several times without significant loss of performance. This makes them more economical and convenient than single-use alternatives like crush washers or thread-locking fluids
• For Best Results: Install on clean, undamaged threads. Hand-tighten until the nylon fully engages, then apply final torque with a wrench; Critical Warning: Always use with the correctly sized bolt. Forcing this nut onto an undersized, oversized, or pitch-mismatched bolt will damage the nylon insert and may gall or strip the bolt threads, causing permanent lock-up and failure