Value Collection 52591401-100 Hex Lock Nut 3/4-10 Grade 5

Product Description

The Value Collection 52591401-100 is a 3/4-10 UNC hex lock nut with a nylon insert locking mechanism, manufactured from Grade 5 steel with a zinc trivalent chromate finish. The nylon insert deforms around the mating thread to resist vibration-induced loosening without requiring a secondary locking element such as a washer or adhesive. Standing 7/8 inches high with a 1-1/16 inch width across flats, this fastener is sized for standard 3/4-inch coarse-thread applications. It is installed by mechanics, millwrights, pipefitters, and general tradespeople wherever a secure, reusable threaded connection is required in light to medium-duty assemblies.

This hex lock nut is suited for structural, mechanical, and equipment-mounting applications that demand reliable thread retention under vibration or dynamic loading. The UNC thread form is the standard coarse-pitch inch series, making this nut compatible with a wide range of bolts, studs, and threaded rod stock used in HVAC equipment frames, electrical enclosures, pump and motor mounts, and general fabrication work. The zinc trivalent chromate finish provides a baseline level of corrosion resistance appropriate for indoor and protected outdoor installations.

Key Features

• Nylon insert locking style resists loosening from vibration and torque cycling without secondary hardware
• Grade 5 steel construction provides medium-strength performance for general mechanical assemblies
• Zinc trivalent chromate finish offers corrosion resistance and meets modern RoHS-compliant coating standards
• 3/4-10 UNC right-hand thread matches the most common coarse-pitch inch-series bolt and stud stock
• Width across flats of 1-1/16 inches accepts standard 1-1/16 inch open-end, box, or socket wrenches

Compatibility

Designed as a standard replacement or new-installation hex lock nut for 3/4-10 UNC right-hand threaded fastener applications in mechanical, structural, and equipment assemblies.

Installation Notes

Power down and de-energize any equipment before accessing fastener locations on live machinery. Use a calibrated torque wrench and follow the applicable equipment manufacturer torque specifications for Grade 5 fasteners at this thread size. Nylon insert lock nuts are intended for one-time use in critical joints, as the nylon insert loses clamping effectiveness after repeated removal and reinstallation. Verify thread condition on the mating bolt or stud before installation to ensure full thread engagement.