Kinhon Rock 1/4"-20 Nylon Insert Lock Nuts, 120-Pack Stainless Steel

A nylon insert adds friction at the threads to help resist loosening from vibration. These Kinhon Rock lock nuts use a 1/4"-20 UNC thread and a hex exterior for tightening. The 120-piece set is suited to projects that call for a secure threaded connection. Choose this locking style when vibration resistance matters, a standard nut may suit simpler fastening needs.

Where it shines

In automotive work, RC projects, CNC machines, and industrial equipment, vibration can put threaded connections under stress. The nylon insert compresses as the nut is tightened, creating friction against the mating threads to help keep the connection secure. Its hex shape gives you an exterior profile for tightening with a suitable tool, while the 1/4"-20 UNC thread identifies the size to match with your fastener.

The 120-piece quantity is practical for repair benches and ongoing DIY projects, where having multiple nuts of the same size on hand can make it easier to keep a job moving. For example, when assembling a small equipment bracket with a matching 1/4"-20 threaded fastener, the nylon insert provides a locking feature as part of the connection. Product details identify the material as stainless steel and the hardware as SAE 304, for use in home, automotive, and industrial applications.

What to know

These are fully threaded, right-hand hex lock nuts with a 1/4"-20 Unified National Coarse (UNC) thread. Match that thread size and style to the mating fastener for proper fit. The nylon insert is the key difference from a conventional hex nut: it adds resistance at the threads rather than relying on a plain nut alone to hold its position.

The product information describes the nuts as reusable three to five times in most cases while maintaining locking performance. Buyers also highlight functionality, secure fit, and compatibility for their particular needs. Those comments reflect user feedback, the right fit still depends on matching the nut to the fastener in your assembly.

Everyday use

Keep the set with workshop hardware for maintenance, home repairs, or equipment assembly that uses 1/4"-20 UNC fasteners. The shared size across all 120 pieces makes it straightforward to select a matching nut for the job, and the nylon insert is useful when the connection may experience vibration. Compared with keeping only standard nuts on hand, this set offers a locking-nut option for applications where added thread friction is useful.

Practical questions

What thread size do these lock nuts use? They have a 1/4"-20 right-hand UNC thread and are fully threaded. Match them with a fastener of the same thread size and style.

How does the nylon insert help? It compresses during tightening and creates friction against the mating threads, helping resist loosening from vibration.

How many nuts are in the set? The set contains 120 lock nuts, all in the 1/4"-20 size.

Final verdict

For DIYers and maintenance teams working with 1/4"-20 UNC fasteners, this set combines a useful workshop quantity with a nylon insert designed to resist vibration-related loosening. Its hex form and stainless steel construction suit a range of home, automotive, and equipment projects where a locking nut is the appropriate choice.