Hillman Fasteners 829720 1/4-20 Nylon Insert Lock Nut 50 Pack

Product Description

The HILLMAN FASTENERS 829720 is a 1/4-20 stainless steel nylon insert lock nut designed to maintain fastener tension in applications subject to vibration, thermal cycling, or repeated stress. The nylon insert deforms around the mating thread to create resistance against loosening without damaging the bolt or stud. These are coarse-thread fasteners, sized for standard 1/4-20 threaded rod, bolts, and machine screws. Sold in a 50-count box, this part is a practical stock item for mechanical, HVAC, plumbing, and electrical trade work where secure, corrosion-resistant fastening is required.

Stainless steel construction makes these lock nuts a suitable choice for outdoor installations, humid environments, rooftop mechanical equipment, pool equipment enclosures, and coastal or high-moisture service areas where carbon steel hardware would corrode. The 1/4-20 coarse thread pattern is one of the most common fastener sizes in trade work and fits a wide range of equipment mounting, panel, and bracket applications. Licensed tradespeople and maintenance professionals frequently stock this size for routine service calls and new installations alike.

Key Features

• Nylon insert provides vibration-resistant locking without thread damage
• Stainless steel construction resists corrosion in wet and outdoor environments
• 1/4-20 coarse thread fits the most common standard bolt and rod size in trade applications
• 50-count pack suitable for stocking service vehicles or shop inventory
• Reusable fastener — nylon insert retains locking function through multiple installations

Compatibility

Designed as a standard 1/4-20 coarse-thread nylon insert lock nut compatible with any 1/4-20 threaded bolt, stud, or rod meeting ASME/ANSI thread standards.

Installation Notes

Install and tighten using a standard hex wrench or nut driver sized for 1/4-20 hardware. No special tools are required, but fastener torque should follow equipment manufacturer specifications for the assembly being serviced. Always de-energize electrical equipment and shut off relevant fluid systems before accessing fastener points in live panels or pressurized assemblies. Do not reuse a nylon insert lock nut if the insert shows visible wear or no longer provides thread resistance.