Value Collection 581547PS Hex Socket Cap Screw 1/2-13 Unc

Product Description

The VALUE COLLECTION 581547PS is a hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. It features a 1/2-13 UNC thread size and a 2-3/8-inch length under head, with partial threading along the shank. The fastener is manufactured from alloy steel and finished with a black oxide coating, which provides moderate corrosion resistance and reduces light reflection. The 3/8-inch hex drive socket head accepts a standard hex key or Allen driver. This screw meets ASME/ANSI B18.3 and ASTM A574 standards, confirming its dimensional accuracy and tensile strength requirements for demanding service conditions.

This cap screw is suited for machine assembly, fixturing, tooling, and general mechanical construction where a flush or recessed fastener head is required. The alloy steel construction handles high clamp loads typical in heavy equipment maintenance, fabrication shops, and industrial production environments. Machinists, maintenance technicians, and millwrights routinely use this style of fastener when access space favors an internal hex drive over an external hex or slot drive. Partially threaded shank construction provides positive thread engagement while allowing the unthreaded shank to locate parts concentrically.

Key Features

• 1/2-13 UNC thread size for standard imperial fastener compatibility
• 2-3/8-inch length under head, partially threaded shank
• 3/8-inch hex socket drive accepts standard Allen keys and hex bit drivers
• Alloy steel construction for high tensile strength and clamp load capacity
• Black oxide finish for mild corrosion resistance and reduced surface reflectivity
• Meets ASME/ANSI B18.3 and ASTM A574 dimensional and mechanical standards

Compatibility

Designed as a standard replacement or stock fastener for applications requiring a 1/2-13 UNC partially threaded hex socket cap screw conforming to ASME/ANSI B18.3 dimensions and ASTM A574 mechanical properties.

Installation Notes

Install using a calibrated torque wrench with the appropriate 3/8-inch hex key or socket bit. De-energize or lock out any machinery before fastener removal or installation per applicable OSHA lockout/tagout procedures. Do not exceed the rated proof load for the alloy steel grade. Inspect threads for damage or contamination before installation to ensure full thread engagement and proper clamp load.