Value Collection 581596PR Hex Socket Cap Screw 1/2-20 Unf

Product Description

The VALUE COLLECTION 581596PR is a partially threaded hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, tooling fixtures, and structural connections. Manufactured from alloy steel with a black oxide finish, this screw measures 5.5 inches under the head and is threaded to the 1/2-20 UNF specification. The 3/8 inch hex drive accepts a standard hex key or Allen-style driver bit. It meets ASME/ANSI B18.3 and ASTM A574 standards, confirming dimensional accuracy and mechanical strength requirements for industrial and trade use. Installers working in manufacturing, maintenance, or mechanical contracting will find this screw suited for precision load-bearing connections.

This socket cap screw is appropriate for use in close-tolerance applications where a flush or recessed fastener head is required. The fine 1/2-20 UNF thread pitch provides greater thread engagement per inch compared to coarse thread, making it well suited for metal-to-metal connections, jigs, fixtures, and equipment frames where vibration resistance or precise clamping load is needed. The black oxide coating provides mild corrosion resistance and reduces light reflection on finished assemblies.

Key Features

• 1/2-20 UNF fine thread for tight clamping and vibration resistance in metal applications
• 5.5 inch length under head accommodates deep or stacked material assemblies
• Partially threaded shank provides a smooth bearing surface for shear load applications
• 3/8 inch hex drive compatible with standard Allen keys and hex driver bits
• Alloy steel construction meets ASTM A574 mechanical strength requirements
• Black oxide finish reduces surface corrosion and glare on exposed hardware

Compatibility

Designed as an OEM-style replacement or direct-fit fastener for machinery, fixtures, and mechanical assemblies requiring 1/2-20 UNF socket cap screws conforming to ASME/ANSI B18.3 and ASTM A574 standards.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or maintenance technician using a calibrated hex key or hex bit driver sized at 3/8 inch. Ensure mating threaded holes are clean, properly tapped to 1/2-20 UNF, and free of debris before installation. De-energize and lock out any equipment before fastening components to rotating or powered machinery. Do not exceed the rated mechanical limits defined by ASTM A574 for this fastener grade.