Value Collection 581574PS Hex Socket Cap Screw 1/2-20 Unf

Product Description

The VALUE COLLECTION 581574PS is a hex socket cap screw designed for applications requiring a strong, compact fastener with a recessed drive profile. It features a 1/2-20 UNF thread form and a 5/8-inch length under head, with full threading from the bearing surface to the tip. Made from alloy steel with a black oxide coating, it delivers solid mechanical strength and modest corrosion resistance in a range of industrial and mechanical assembly environments. Installation requires a 3/8-inch hex (Allen) drive key or bit. This screw meets ASME/ANSI B18.3 and ASTM A574 standards, making it suitable for structural and load-bearing fastening tasks where torque retention and dimensional consistency matter.

This screw is used in general mechanical assembly, tooling fixtures, machine frames, hydraulic components, and similar applications where a low-profile, high-strength fastener is required. The 1/2-20 UNF fine thread pitch provides greater pullout resistance and finer torque adjustment compared to coarse-thread equivalents. It is commonly installed by machinists, millwrights, and maintenance technicians working on industrial equipment, mechanical systems, and fabricated assemblies requiring controlled clamping force.

Key Features

• 1/2-20 UNF fine thread for improved pullout strength and precise torque control
• Fully threaded shank along the 5/8-inch length under head
• 3/8-inch hex socket drive for use with standard Allen keys or hex bit drivers
• Alloy steel construction meets ASTM A574 mechanical property requirements
• Black oxide finish provides mild corrosion resistance and reduces light glare on exposed fasteners
• Conforms to ASME/ANSI B18.3 dimensional standards for socket cap screws

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw suitable for use in tapped holes with 1/2-20 UNF internal threads across a wide range of industrial, mechanical, and fabrication applications.

Installation Notes

Installation is performed using a 3/8-inch hex key or socket bit driver; ensure the drive tool is fully seated before applying torque to avoid cam-out or socket damage. Verify the mating tapped hole meets 1/2-20 UNF thread specifications and is clean and free of debris before fastening. Do not exceed the rated mechanical limits of the fastener or the material being clamped. Follow applicable industry torque guidelines for ASTM A574 alloy steel socket cap screws when torque specifications are required by the assembly procedure.