Holo-krome 72258 Hex Socket Cap Screw 1/2-13 Unc

Product Description

The HOLO-KROME 72258 is a partially threaded hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and maintenance environments. The fastener measures 6.5 inches in length under the head and features a 1/2-13 UNC thread size. Drive engagement is a 3/8-inch internal hex socket. Constructed from alloy steel with a black oxide coating, the 72258 delivers corrosion resistance and surface hardness suited to demanding service conditions. It meets ASME B18.3 and ASTM A574 standards, confirming dimensional accuracy and mechanical strength requirements expected by professional tradespeople and maintenance technicians.

This cap screw is applicable across a wide range of industrial and mechanical assembly scenarios, including equipment mounting, machine frames, and structural connections where a flush or low-profile socket-drive fastener is required. The partial threading is appropriate for clamping applications where thread engagement through a portion of the grip length provides superior holding force. Maintenance professionals, millwrights, pipefitters, and industrial mechanics commonly install this type of fastener in both new construction and retrofit service work.

Key Features

• 1/2-13 UNC thread size for broad compatibility with standard tapped holes
• 6.5 inches length under head, partially threaded for superior clamp load
• 3/8-inch internal hex socket drive for positive tool engagement
• Alloy steel construction meets ASTM A574 mechanical strength requirements
• Black oxide finish provides moderate corrosion resistance and reduces light reflection
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as an OEM-style replacement or standard-service hex socket cap screw for any application requiring a 1/2-13 UNC partially threaded socket cap screw conforming to ASME B18.3 and ASTM A574.

Installation Notes

Installation requires a 3/8-inch hex key or socket driver of appropriate quality and length for the application. Always ensure the receiving tapped hole is clean and free of debris before installation. Power down or de-energize any equipment before fastener service on live machinery. Follow applicable industry standards and equipment manufacturer torque guidance when determining final installation parameters.