Value Collection 440037 5/8-11 Unc Hex Lock Nut 18-8 Ss 5-pack

Product Description

The VALUE COLLECTION 440037 is a 5/8-11 UNC hex lock nut with an expanding flex top, manufactured from 18-8 stainless steel. The expanding flex top design provides prevailing-torque locking action without the need for adhesives or separate locking inserts, making it suitable for vibration-prone assemblies and fastener joints that require reliable retention. At 0.41 inches in height and with a width across flats of 13/14 inches, this nut is sized for standard 5/8-11 UNC threaded rod, bolts, and studs. Sold in a pack of 5. This hardware is used across HVAC equipment mounting, mechanical systems, structural brackets, and general industrial fastening applications.

This hex lock nut is appropriate for use wherever a 5/8-11 UNC thread engagement is required and vibration or dynamic loading is a concern. Typical applications include equipment base mounting, pipe support hardware, mechanical room installations, and general trade fastening jobs. The 18-8 stainless steel construction resists corrosion in damp or mildly corrosive environments, making it a practical choice for both indoor mechanical rooms and outdoor equipment pads. Suitable for use by HVAC technicians, plumbers, pipefitters, electricians, and general contractors.

Key Features

• Expanding flex top provides prevailing-torque locking without separate inserts or thread-locking compound
• 18-8 stainless steel construction for corrosion resistance in damp and outdoor environments
• 5/8-11 UNC thread — standard coarse thread for wide fastener compatibility
• Meets IFI 100/107 and NASM 25027 standards
• Sold in a pack of 5 units
• Low-profile hex geometry accepts standard 5/8-inch hex wrench or socket

Compatibility

Designed for use with 5/8-11 UNC threaded bolts, rods, and studs. Suitable as an OEM-style or replacement prevailing-torque lock nut wherever IFI 100/107 or NASM 25027 compliant hardware is specified.

Installation Notes

Installation is performed with a standard socket or open-end wrench sized for a 13/14-inch width across flats. Shut down and de-energize any equipment before accessing fastener joints in electrical or mechanical assemblies. The expanding flex top is a single-use prevailing-torque design; reuse after full removal is not recommended in critical joints. Follow applicable mechanical and structural codes for torque requirements specific to the assembly being serviced.