Value Collection 581563PR Hex Socket Cap Screw 1/2-13 Unc

Product Description

The VALUE COLLECTION 581563PR is a 1/2-13 UNC hex socket cap screw designed for high-strength fastening applications in industrial and mechanical assemblies. This screw measures 10 inches in length under the head and is partially threaded, providing a smooth shank section for accurate alignment and load distribution across clamped joint interfaces. Driven by a 3/8-inch hex (Allen) key, it is suited for installations where a low-profile head and high clamp load are required. The alloy steel construction and black oxide finish make it a standard choice for tooling, machinery, and structural fixturing work performed by machinists, millwrights, and maintenance technicians.

This socket cap screw is used in general industrial, manufacturing, and maintenance applications where a high-tensile fastener with a recessed drive is required. The partially threaded shank helps locate mating components accurately during assembly and resists shear loading better than fully threaded alternatives. Typical install scenarios include machine frames, fixture plates, jigs, die sets, and mechanical sub-assemblies requiring reliable, repeatable torque. It conforms to ASME/ANSI B18.3 and ASTM A574 standards, which are commonly specified in engineering drawings and procurement for alloy socket head cap screws.

Key Features

• 1/2-13 UNC thread for wide compatibility with standard inch-series tapped holes
• 10-inch length under head with partial threading for shank alignment and shear resistance
• 3/8-inch hex drive for high-torque installation with standard Allen keys or hex bit drivers
• Alloy steel construction meets ASTM A574 high-strength requirements
• Black oxide finish provides mild corrosion resistance and reduces light reflection in tooling environments
• Meets ASME/ANSI B18.3 dimensional standard for socket head cap screws

Compatibility

Designed as a standard ASME/ANSI B18.3 compliant socket head cap screw for use in any application requiring a 1/2-13 UNC tapped hole with a minimum thread engagement appropriate for alloy steel fasteners.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a 3/8-inch hex key or socket bit driver. Ensure the mating tapped hole is clean, properly sized to 1/2-13 UNC, and free of debris before installation. Apply thread lubricant or anti-seize as required by the assembly specification to achieve accurate torque-to-clamp-load results. De-energize and lock out all machinery before fastener replacement or maintenance work per applicable OSHA lockout/tagout procedures.