Holo-krome 72238 Hex Socket Cap Screw 1/2-13 Unc

Product Description

The HOLO-KROME 72238 is a hex socket cap screw engineered for high-strength fastening applications in mechanical, industrial, and trade service environments. This screw features a 1/2-13 UNC thread size with a 2-1/2 inch length under head and is partially threaded for positive thread engagement in tapped holes. The drive is a 3/8-inch internal hex socket, requiring a matching hex key or bit driver. Constructed from alloy steel with a black oxide finish coating, the 72238 delivers corrosion resistance and a clean, low-reflectance appearance suitable for both exposed and concealed fastening points. Licensed tradespeople and maintenance technicians working with equipment frames, HVAC mounting assemblies, and mechanical enclosures will find this fastener a reliable standard choice.

The 72238 is suited for use in residential and commercial mechanical installations where a high-tensile, partially threaded cap screw is required. Typical applications include securing HVAC equipment frames, structural brackets, pump mounts, and similar assemblies that demand consistent clamping force and resistance to vibration loosening. The 3/8-inch hex socket drive allows use with standard hex keys and power driver bits, making it practical in tight clearance situations common in equipment rooms and mechanical chases.

Key Features

• 1/2-13 UNC thread size for broad compatibility with standard tapped holes and nuts
• 2-1/2 inch length under head with partial threading for positive engagement in deep tapped holes
• 3/8-inch internal hex socket drive for use with hex keys or socket drivers
• Alloy steel construction meets ASME B18.3 and ASTM A574 fastener standards
• Black oxide finish coating provides moderate corrosion resistance and low-reflectance appearance

Compatibility

Designed as a standard 1/2-13 UNC hex socket cap screw conforming to ASME B18.3 and ASTM A574, suitable for use in any application requiring a high-strength alloy steel cap screw of this thread and length specification.

Installation Notes

Installation is performed with a 3/8-inch hex key or matching bit driver; ensure the drive tool is fully seated before applying torque to avoid cam-out and socket damage. Always verify the tapped hole thread specification matches 1/2-13 UNC before installation. Follow applicable mechanical and structural codes for the job type, including relevant sections of ASME standards for bolted joints. De-energize and lock out equipment before accessing fastener locations on powered mechanical or electrical assemblies.