Value Collection 581571PR Hex Socket Cap Screw 1/2-13 Unc

Product Description

The VALUE COLLECTION 581571PR is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, structural connections, and industrial equipment. It features a 1/2-13 UNC thread, a 16-inch length under head, and a 3/8-inch hex drive socket. The screw is partially threaded, which concentrates clamping force and reduces the risk of thread galling in thick-material joints. Machined from alloy steel and finished with a black oxide coating, it offers elevated tensile strength and moderate corrosion resistance in protected or lightly exposed environments. This fastener meets ASME/ANSI B18.3 and ASTM A574 standards. Installers and maintenance technicians use this screw wherever a clean hex drive and reliable clamping performance are required.

This fastener is suited for heavy machinery, fabrication, maintenance, and industrial assembly work requiring a long-reach socket cap screw. The 16-inch under-head length makes it appropriate for thick-stack assemblies, custom fixtures, jigs, and structural tie-through applications. The 1/2-13 UNC thread is a standard coarse-pitch size commonly tapped into steel, cast iron, and aluminum components. Partial threading leaves a smooth shank section for precise hole alignment and shear load transfer.

Key Features

• 1/2-13 UNC coarse thread for compatibility with standard tapped holes in steel and aluminum
• 16-inch length under head for deep or thick-stack fastening applications
• 3/8-inch hex drive socket for use with standard hex keys and socket drivers
• Partially threaded shank for shear load transfer and accurate hole alignment
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide finish provides moderate corrosion resistance and reduces light reflection in service

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw for use in any 1/2-13 UNC tapped hole requiring a long-reach, high-strength fastener.

Installation Notes

This fastener is typically installed by machinists, millwrights, or maintenance technicians using a calibrated hex key or socket driver sized to 3/8 inch. Confirm the mating tapped hole depth and thread engagement meet ASME standards before installation. Apply an appropriate thread lubricant or anti-seize compound when joining dissimilar metals or in applications subject to temperature cycling. Always de-energize, depressurize, or lock out equipment before accessing fastened assemblies in service.