Value Collection B52001628 Hex Lock Nut 5/8-18 Grade 8

Product Description

The VALUE COLLECTION B52001628 is a 5/8-18 hex lock nut with a nylon insert locking mechanism, manufactured from Grade 8 steel with a zinc yellow dichromate finish. The nylon insert creates prevailing torque by compressing against the mating thread, resisting loosening from vibration and dynamic loads without requiring secondary locking hardware. At 3/4 inches high and 15/16 inches across the flats, this nut follows UNF (Unified National Fine) thread standards and is sized for standard hex tooling. The zinc yellow dichromate coating provides corrosion resistance in moderate-exposure environments. Installers in automotive, heavy equipment, structural, and industrial maintenance applications rely on Grade 8 nylon insert lock nuts where high clamp load and vibration resistance are required.

This lock nut is suited for right-hand threaded fastener assemblies calling for a 5/8-18 UNF specification. Typical applications include suspension components, hydraulic fittings, frame assemblies, and general mechanical assemblies subject to vibration or cyclic loading. The Grade 8 material rating makes it appropriate for high-stress connections where a lower-grade fastener would be insufficient. It is sold individually with a minimum order quantity of 5 units.

Key Features

• Nylon insert locking style provides prevailing torque without secondary hardware
• Grade 8 steel construction supports high-clamp-load applications
• 5/8-18 UNF right-hand thread for fine-thread fastener assemblies
• Zinc yellow dichromate finish for corrosion resistance in moderate environments
• 3/4 inch height and 15/16 inch width across flats for standard hex tooling
• Conforms to inch-measurement UNF fastener standards

Compatibility

Designed for use with 5/8-18 UNF right-hand threaded bolts and studs in inch-measurement fastener assemblies requiring a prevailing-torque hex lock nut.

Installation Notes

Installation is performed with a standard 15/16 inch hex wrench or socket. Nylon insert lock nuts are generally intended for single use — once the nylon has been compressed by a mating thread, the prevailing torque value is reduced and reuse is not recommended for critical joints. Torque to the fastener assembly specification for the application; do not rely on feel alone. Ensure the mating bolt thread condition is clean and undamaged before installation.