Holo-krome 72115 Hex Socket Cap Screw 1/4-20 Unc 4 in

Product Description

The HOLO-KROME 72115 is a hex socket cap screw designed for precision fastening in mechanical assemblies, industrial equipment, and trade installations where high tensile strength and a clean, low-profile head are required. Manufactured from alloy steel with a black oxide finish, this fastener meets ASME B18.3 and ASTM A574 standards. The screw features a 1/4-20 UNC thread size, a 4-inch length under head, and partial threading along the shank. Drive engagement is through a 3/16-inch hex socket, compatible with standard hex keys and socket drivers used in the field.

This screw is suited for mechanical, HVAC, plumbing, and electrical panel applications where a recessed-drive fastener is needed to secure components in confined spaces or flush-mount installations. Partial threading provides a strong grip in through-hole and blind-hole configurations. The black oxide coating provides moderate corrosion resistance and reduces galling during installation. This fastener is commonly installed by millwrights, HVAC technicians, plumbers, and electricians working on equipment frames, brackets, and access panels.

Key Features

• 1/4-20 UNC thread size for broad compatibility with standard tapped holes
• 4-inch length under head with partial threading for secure engagement in deeper assemblies
• Alloy steel construction conforming to ASTM A574 for high tensile strength
• Black oxide finish for corrosion and galling resistance
• 3/16-inch hex socket drive for use with standard Allen keys and hex socket drivers
• Meets ASME B18.3 dimensional standards for consistent fitment

Compatibility

Designed as a standard 1/4-20 UNC hex socket cap screw for use in any application requiring an ASME B18.3-compliant fastener with a 4-inch length under head and partial threading.

Installation Notes

Installation should be performed by a qualified technician using a properly sized 3/16-inch hex key or socket driver to avoid rounding the drive. Ensure the receiving tapped hole is clean and free of debris before threading. Do not overtighten; follow the torque specifications listed in the equipment manufacturer's service documentation. Power down or de-energize any equipment before accessing fastener locations on electrical or mechanical enclosures.