Holo-krome 72250 Hex Socket Cap Screw 1/2-13 Unc

Product Description

The HOLO-KROME 72250 is a partially threaded hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and trade assembly work. It features a 1/2-13 UNC thread size and measures 4.5 inches in length under the head. The fastener is machined from alloy steel and finished with a black oxide coating, which provides mild corrosion resistance and reduces light reflection. Drive engagement is through a 3/8 inch internal hex socket. This screw is a standard choice for machine assembly, structural bolting, and equipment fabrication where a recessed drive and high tensile strength are required.

This socket cap screw is suited for use in mechanical assemblies, industrial equipment, and structural applications where flush or recessed fastening is preferred. The partial threading allows for precise clamping force across unthreaded shank sections, making it appropriate for through-bolted joints and precision-fit bore applications. It is commonly installed by millwrights, machinists, pipefitters, and general tradespeople working on machinery, brackets, flanges, and similar structural connections.

Key Features

• 1/2-13 UNC thread form for broad compatibility with standard inch-series tapped holes
• 4.5 inch length under head accommodates thicker material stacks
• Partially threaded shank provides a solid grip zone for precision-fit applications
• Alloy steel construction meets ASME B18.3 and ASTM A574 standards for high-strength fasteners
• Black oxide finish offers mild corrosion resistance and a low-glare surface
• 3/8 inch hex socket drive works with standard hex keys and socket drivers

Compatibility

Designed as a standard ASME B18.3 and ASTM A574 compliant hex socket cap screw suitable for use in any application requiring a 1/2-13 UNC internally threaded hole and a 3/8 inch hex drive tool.

Installation Notes

This fastener is installed using a 3/8 inch hex key or socket driver. Always ensure the mating tapped hole meets 1/2-13 UNC thread specifications before installation. De-energize, depressurize, or lock out the equipment being serviced before fastener installation or removal, following applicable OSHA lockout/tagout procedures. Do not use impact tools at full torque without a torque-limiting adapter, as alloy socket cap screws can be damaged by overtorque.