Value Collection 39663 Hex Lock Nut 3/8-24 Grade 8 Steel

Product Description

The VALUE COLLECTION 39663 is a 3/8-24 UNF hex lock nut with a nylon insert locking mechanism, manufactured from Grade 8 steel with a zinc yellow dichromate finish. The nylon insert provides prevailing-torque locking action, resisting loosening under vibration and dynamic loads without damaging mating thread surfaces. At 15/32 inches high with 9/16 inches across the flats, this nut meets standard hex tooling requirements. The zinc yellow dichromate coating delivers corrosion resistance in moderate-exposure environments. This fastener is suited for mechanical, HVAC equipment assembly, and structural applications where high-strength fastening with vibration resistance is required.

The 39663 is used in applications demanding a high-strength, fine-thread lock nut, including equipment mounting, bracket assembly, and mechanical connections subject to vibration. The 3/8-24 UNF thread is common in HVAC equipment frames, blower assemblies, and general mechanical service work. Right-hand thread direction follows standard installation practice. This nut is sold individually with a minimum order quantity of 50 units, making it appropriate for shop stock, service vans, or production line use.

Key Features

• Nylon insert locking style provides prevailing-torque resistance without thread damage
• Grade 8 steel construction for high tensile and proof load strength
• Zinc yellow dichromate finish for corrosion resistance in moderate-exposure environments
• 3/8-24 UNF fine-thread specification for precise clamping and reduced thread pitch
• Right-hand thread direction — standard installation with clockwise tightening
• 9/16 inches across flats — compatible with standard hex tooling

Compatibility

Designed as an OEM-style replacement or service stock hex lock nut for 3/8-24 UNF threaded fastener applications in HVAC equipment assembly, mechanical service, and general industrial use.

Installation Notes

Install and remove using a standard 9/16-inch hex wrench or socket. Nylon insert lock nuts are single-use by design — the insert deforms on first installation, and reuse reduces locking effectiveness. Power down or de-energize any equipment before fastener service. Follow applicable mechanical assembly codes and equipment manufacturer torque guidance when specified in service documentation.