Value Collection 1-THN-4C Hex Lock Nut 4-40 Nylon Insert

Product Description

The VALUE COLLECTION 1-THN-4C is a nylon insert hex lock nut machined from 18-8 stainless steel to a 4-40 UNC thread specification. The nylon insert compresses against the bolt threads to resist vibration-induced loosening without damaging the mating fastener. At 0.125 inches tall with a 0.25-inch width across flats, this nut fits tight clearances where a standard hex nut would work loose under cyclic load. Licensed trades and maintenance technicians reach for this hardware in corrosion-prone environments where carbon steel hardware would fail prematurely.

This fastener suits light-duty mechanical assemblies in residential and commercial applications where moisture, mild chemicals, or outdoor exposure rules out plain steel. Typical use cases include electrical enclosure hardware, HVAC cabinet panels, plumbing access covers, and equipment mounting brackets. The right-hand thread direction matches standard tooling and fastener inventory. The stainless steel construction handles moderate corrosion exposure without galling under normal installation torque.

Key Features

• Nylon insert locking style resists vibration loosening without a secondary locking device
• 18-8 stainless steel construction for corrosion resistance in wet or outdoor environments
• 4-40 UNC thread size with right-hand thread direction for compatibility with standard tooling
• Compact profile: 0.125 inches height and 0.25 inches width across flats
• Inch system of measurement with UNC fastener standard

Compatibility

Designed as a standard nylon insert hex lock nut for use with 4-40 UNC threaded fasteners in inch-measurement assemblies.

Installation Notes

Installation requires a wrench or nut driver sized for 0.25-inch hex flats. Verify the mating bolt thread specification is 4-40 UNC before installation to avoid cross-threading. As with all nylon insert lock nuts, reuse is not recommended once the insert has been fully engaged, as the locking torque diminishes after the first seating. Follow applicable NEC or equipment manufacturer torque guidelines where specified.