Description
Overview:
These UNC nylon insert locking nuts are steel hex nuts with a bright zinc-plated finish for dependable corrosion resistance. Sized at 1/2 inch (12.7 mm) with a UNC coarse thread, they provide a secure, vibration-resistant hold thanks to the nylon ring that grips the bolt threads. They are suitable for use across construction plant, agricultural kit, trailers, and garden machinery such as mowers and generators, where fixings are exposed to weather and vibration. Supplied in a bulk pack of 100, they are a practical choice for workshops, site boxes, and maintenance teams who need a consistent stock of reliable fasteners. Designed for straightforward installation with standard spanners or sockets, they help keep guards, brackets, housings, and engine components firmly in place.
Key Features:
- Zinc-plated steel for durable corrosion resistance in outdoor and industrial use
- Nylon insert provides prevailing torque to resist loosening under vibration
- 1/2 inch (12.7 mm) UNC coarse thread for compatibility with common 1/2" UNC bolts
- Hex form for easy fitting using standard spanners and sockets
- Reliable clamping for assemblies subject to shock and movement
- Clean finish to help reduce galling and ease installation
- Suitable for machinery assembly, repairs, and preventative maintenance routines
- Supplied in a cost-effective bulk pack of 100 for workshop and site use
Typical Applications:
Securing engine covers, guards, brackets, frames, and mountings on construction equipment, compactors, mixers, generators, pumps, pressure washers, trailers, agricultural implements, and garden machinery. Ideal for repair and assembly tasks where vibration is present and a repeatable, secure fastening is required.
Also known as:
Nyloc nut, nylon insert nut, nylon locknut, self-locking nut, elastic stop nut, prevailing torque nut, insert locknut, stop nut, vibration-resistant lock nut, UNC nyloc.
Product Specifications
| L&S Part No. | 903 0654 |
|---|---|
| Unit of Sale | Pack of 100 |
| Key Features | - Zinc-plated steel for corrosion resistance - Nylon insert resists loosening under vibration - 1/2 inch UNC coarse thread compatibility - Hex form fits standard spanners and sockets - Bulk pack of 100 for workshop use |


