Grainger 1/4" UNC nut 1/4" UNC hex nut, self-locking with nylon insert

Grainger 1/4" UNC nut, self-locking hex nut with nylon insert

Sometimes it’s not the big machine but the inconspicuous detail that decides whether a project holds firmly or quietly comes loose again. That’s exactly where the Grainger 1/4" UNC hex nut with nylon insert comes into play – small, but pretty crucial when you rely on dependable bolted joints.

Precise 1/4" UNC right-hand thread for secure connections

The nut uses a standardized 1/4" UNC right-hand thread. That means you can use it anywhere a 1/4" UNC thread is specified – classic applications include mechanical engineering, jigs and fixtures, model building, or on mounting rails and brackets. Thanks to the Unified National Coarse thread, the nut engages cleanly, can be tightened in a controlled way, and ensures a stable, repeatable connection.

Hex shape for easy installation with standard tools

The design is deliberately classic: a hex nut. You can install it with common open-end wrenches, ring spanners, or sockets – no special tools, no fuss. Especially when space is tight or you just want to “quickly tighten” something, this shape is simply practical: put it on, tighten, done.

Self-locking thanks to nylon insert – less retightening, more peace of mind

The special feature of this version is the integrated nylon insert. This insert lightly clamps onto the 1/4" UNC thread when you screw it on and increases friction so the nut doesn’t simply loosen by itself. This is particularly helpful when vibrations are involved, for example on equipment, machines, stands, or brackets that are moved or transported regularly.

Instead of constantly checking and retightening, you can design the connection to be significantly more stable with this self-locking nut. It stays where it’s supposed to sit, even when things get a bit rough.

18-8 stainless steel – durable, corrosion-resistant, suitable for everyday use

The Grainger 1/4" UNC nut is made from 18-8 stainless steel. In everyday use, this stainless grade is something like the reliable all-rounder: robust, corrosion-resistant, and suitable for many environments in which standard steel nuts would quickly become unsightly or, in the worst case, stiff and difficult to turn.

Whether in the workshop, studio, production environment, or moderately humid surroundings, 18-8 stainless steel ensures that threads stay clean, don’t seize, and that the nut can still be properly installed even after a long time.

Ideal as an addition to other 1/4" UNC fasteners

We see this self-locking hex nut as the perfect addition to other 1/4" UNC components. It integrates seamlessly into setups where you also use, for example, 1/4" UNC wing nuts, classic hex nuts made of blackened steel, or knurled nuts with 1/4" UNC right-hand thread. This keeps your system consistent and you don’t have to juggle different thread types.

Technical details of the Grainger 1/4" UNC hex nut with nylon insert

• Nut type: hex
• Thread type: 1/4" UNC, right-hand thread
• Design: self-locking thanks to integrated nylon insert
• Material: 18-8 stainless steel
• Application area: anywhere a 1/4" UNC right-hand thread is required and connections must not come loose unintentionally

Who this nut is particularly interesting for

If you have bolted joints that must not loosen by themselves but still need to remain removable, this is a very good fit. Whether you want to securely fasten brackets, frames, equipment feet, adapter plates, or smaller assemblies with 1/4" UNC thread, the combination of hex shape, nylon insert, and 18-8 stainless steel makes this nut a very solid choice.

And yes, it’s only a small component. But it’s often exactly these small parts that ultimately decide whether something works reliably in the long term or keeps causing trouble.