Value Collection MP39661 Hex Lock Nut 1/4-28 Grade 8

Product Description

The VALUE COLLECTION MP39661 is a 1/4-28 UNF hex lock nut with a nylon insert locking mechanism, manufactured from Grade 8 steel with a zinc yellow dichromate finish. The nylon insert creates interference with mating threads to resist loosening caused by vibration and torque. At 19/64 inches high and 7/16 inches across the flats, this nut fits standard 1/4-28 fine-thread fastener assemblies. The zinc yellow dichromate finish provides corrosion resistance suitable for general industrial and mechanical applications. This fastener is installed by maintenance technicians, millwrights, and trade professionals working on equipment assemblies that require reliable thread locking without adhesives.

This hex lock nut is suited for fine-thread fastener applications in mechanical, HVAC, electrical, and general equipment assembly work. The 1/4-28 UNF thread designation makes it compatible with standard fine-pitch 1/4-inch fastener systems. It is appropriate for use in vibration-prone environments where a prevailing-torque locking nut is required. The right-hand thread direction follows standard fastener convention. Sold individually with a minimum order quantity of 50 pieces.

Key Features

• Nylon insert locking style provides prevailing-torque resistance without thread adhesive
• Grade 8 steel construction for high-strength fastener applications
• Zinc yellow dichromate finish for corrosion resistance
• 1/4-28 UNF right-hand thread for compatibility with standard fine-thread fastener systems
• Compact profile: 19/64 inches high, 7/16 inches across flats
• Minimum order quantity of 50 pieces

Compatibility

Designed for use with 1/4-28 UNF fine-thread fastener assemblies in standard inch-measurement applications requiring a prevailing-torque hex lock nut.

Installation Notes

Installation requires a standard 7/16-inch wrench or socket. Power down or de-energize any equipment before servicing fastener assemblies on mechanical or electrical enclosures. Do not reuse nylon insert lock nuts after removal, as the insert loses prevailing-torque effectiveness once it has been run down. Follow applicable equipment manufacturer torque guidelines and relevant industry codes for the specific assembly.