Holo-krome 72120 Hex Socket Cap Screw 5/16-18 Unc Alloy Steel

Product Description

The HOLO-KROME 72120 is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, maintenance, and equipment fabrication. It features a 5/16-18 UNC thread with a 1/2 inch length under head and full threading along the shank. The fastener is manufactured from alloy steel and finished with a black oxide coating that provides moderate corrosion resistance and reduces surface glare. Drive engagement is through a 1/4 inch internal hex socket, allowing high torque transmission in confined spaces. This screw meets ASME B18.3 and ASTM A574 standards, making it suitable for demanding structural and mechanical fastening tasks.

This cap screw is commonly used in industrial equipment, hydraulic component assemblies, machine frames, and general mechanical maintenance where a flush or low-profile head profile is required. The fully threaded configuration maximizes thread engagement in through-hole and tapped-hole applications. It is well suited for work performed by millwrights, maintenance technicians, pipefitters, and mechanical contractors dealing with equipment that requires high-strength socket fasteners.

Key Features

• 5/16-18 UNC thread size with full threading along the shank
• 1/2 inch length under head for compact fastening applications
• 1/4 inch hex socket drive for high torque in tight spaces
• Alloy steel construction meets ASTM A574 strength requirements
• Black oxide finish for moderate corrosion resistance and low glare
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any tapped or through-hole application requiring a 5/16-18 UNC thread pattern and a 1/4 inch hex drive socket.

Installation Notes

Installation is performed with a 1/4 inch hex key or socket driver. Verify that the tapped hole thread class and material are appropriate for the torque load before installation. Always de-energize and lock out equipment before performing fastener maintenance on powered machinery. Do not exceed the rated drive torque for the fastener size, and inspect threads for damage before reuse.