Value Collection 581553PR Hex Socket Cap Screw 1/2-13 Unc

Product Description

The VALUE COLLECTION 581553PR is a hex socket cap screw engineered for high-strength fastening applications in industrial, mechanical, and structural assemblies. It features a 1/2-13 UNC thread size and a 5-1/4 inch length under head, with partial threading along the shank. The screw is machined from alloy steel and finished with a black oxide coating that provides mild corrosion resistance and reduces surface reflectivity. Drive engagement is via a 3/8 inch internal hex socket, making it compatible with standard hex key drivers and socket tooling. This fastener meets ASME/ANSI B18.3 and ASTM A574 standards and is appropriate for use by millwrights, maintenance mechanics, and machine builders.

This screw is suited for bolted joint applications requiring controlled clamping force and precise thread engagement. Partial threading allows the unthreaded shank to bear shear loads, which is common in machinery frames, jigs, fixtures, and equipment mounting situations. The 1/2-13 UNC coarse thread pitch provides reliable pull-out resistance in steel, cast iron, and other metallic base materials. This fastener is appropriate for both OEM assembly and field maintenance use.

Key Features

• 1/2-13 UNC coarse thread for strong pull-out resistance in metal substrates
• 5-1/4 inch length under head accommodates thick stack-ups and deep clearance holes
• Partially threaded shank transfers shear loads and maintains alignment
• Alloy steel construction rated to ASTM A574 for high tensile and proof load requirements
• Black oxide finish reduces surface glare and provides light corrosion protection in dry environments
• 3/8 inch hex socket drive compatible with standard hex keys and drive socket tooling

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw for use in any application requiring a 1/2-13 UNC partially threaded alloy steel fastener with a 3/8 inch internal hex drive.

Installation Notes

Installation should be performed by a qualified mechanic or millwright using a properly sized 3/8 inch hex key or drive socket. Ensure the mating threaded hole or nut meets the appropriate UNC thread class before installation. Apply thread lubricant or anti-seize compound as required by the joint specification to achieve accurate clamp load. Do not exceed the rated proof load of the fastener as specified under ASTM A574.