Holo-krome 72117 Hex Socket Cap Screw 1/4-20 Unc Alloy Steel

Product Description

The HOLO-KROME 72117 is a hex socket cap screw designed for high-strength fastening applications requiring precision and reliability. It features a 1/4-20 UNC thread, a 3.5-inch length under the head, and partial threading along the shank. The drive is a 3/16-inch hex socket, compatible with standard hex keys and socket drivers. Manufactured from alloy steel with a black oxide finish, this fastener provides solid mechanical strength and moderate corrosion resistance in controlled environments. It conforms to ASME B18.3 and ASTM A574 standards, making it appropriate for structural and mechanical assemblies where torque ratings and dimensional tolerances must meet recognized specifications.

This screw is suited for mechanical, industrial, and light structural applications where a recessed-drive cap screw is needed. The partial threading allows it to be used in through-hole and blind-hole configurations, with the unthreaded shank providing a bearing surface and added shear resistance. It is commonly installed in machinery, equipment frames, tool fixtures, and fabricated assemblies across manufacturing, maintenance, and industrial service environments.

Key Features

• 1/4-20 UNC thread for standard inch-series fastener compatibility
• 3.5-inch length under head with partial threading for shear load applications
• 3/16-inch hex socket drive for use with standard Allen keys or hex bit drivers
• Alloy steel construction meets ASTM A574 high-strength requirements
• Black oxide finish provides a uniform appearance and light surface protection
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as a standard 1/4-20 UNC hex socket cap screw conforming to ASME B18.3, suitable for use in any application requiring an inch-series cap screw of this thread and length specification.

Installation Notes

Installation should be performed by a qualified mechanic or maintenance technician using a calibrated hex key or socket driver sized at 3/16 inch. Ensure the mating threaded hole is clean and free of debris before driving the fastener. Do not exceed the torque rating specified by the equipment manufacturer or the ASTM A574 standard for this fastener size. Use thread-locking compound or washers only as specified by the assembly design.