Value Collection 872399PR Hex Socket Cap Screw 1/2-20 Unf

Product Description

The VALUE COLLECTION 872399PR is a hex socket cap screw designed for mechanical fastening applications requiring precise thread engagement and reliable clamping force. Sized at 1/2-20 UNF with a 1-3/4 inch length under head and fully threaded shank, this fastener is driven with a 3/8 inch hex key. Constructed from alloy steel with a zinc-plated finish for corrosion resistance, it meets ASME B18.8 and ASTM A574 standards. This screw is suited for use by machinists, maintenance technicians, and trade professionals working on equipment assemblies, structural mounts, or mechanical components requiring a fine-thread, high-strength socket cap fastener.

This fastener is used across a broad range of industrial and trade applications, including HVAC equipment mounting, electrical enclosure assembly, plumbing fixture installation, and general mechanical maintenance. The 1/2-20 UNF fine thread pitch provides tighter thread engagement and greater resistance to loosening under vibration compared to coarse-thread equivalents. The fully threaded shank maximizes thread contact throughout the grip length, making it well suited for shallow-hole installations and close-tolerance assemblies where consistent torque and clamp load are required.

Key Features

• 1/2-20 UNF fine thread for tight engagement and vibration resistance
• 1-3/4 inch length under head, fully threaded shank
• Driven with a 3/8 inch hex key for recessed or flush-mount installations
• Alloy steel construction meets ASTM A574 for high tensile strength
• Zinc-plated finish provides baseline corrosion protection
• Conforms to ASME B18.8 dimensional standards

Compatibility

Designed as a standard 1/2-20 UNF hex socket cap screw for use in any application requiring an ASME B18.8 and ASTM A574 compliant alloy steel fastener with a 3/8 inch hex drive.

Installation Notes

Installation requires a 3/8 inch hex key or socket driver; ensure the mating threaded hole is clean and free of debris before installation. Power down or de-energize any equipment prior to fastener service per applicable safety codes. Avoid over-tightening, as alloy steel fasteners in fine-thread applications are sensitive to torque — consult the equipment manufacturer's torque specifications. General mechanical fastener work should follow applicable ASME or equipment OEM guidelines.