Holo-krome 72240 Hex Socket Cap Screw 1/2-13 Unc

Product Description

The HOLO-KROME 72240 is a hex socket cap screw designed for high-strength fastening applications in industrial and mechanical assemblies. It features a 1/2-13 UNC thread with a 3/8-inch hex drive socket and measures 2-3/4 inches in length under the head. The screw is partially threaded and manufactured from alloy steel with a black oxide coating that provides moderate corrosion resistance and reduces surface glare. It conforms to ASME B18.3 and ASTM A574 standards, making it suitable for structural and load-bearing fastener applications where dimensional and mechanical tolerances are specified. Machinists, millwrights, and maintenance technicians are the typical installers of this fastener type.

This screw is used in general industrial machinery, equipment frames, jigs, fixtures, and mechanical assemblies requiring a recessed-drive cap screw. The 1/2-13 UNC coarse thread is a standard fit for tapped holes and threaded inserts found across a wide range of metal fabrication, maintenance, and repair environments. The alloy steel construction and black oxide finish make it appropriate for interior or sheltered applications where contact with standing water or harsh chemical exposure is limited.

Key Features

• 1/2-13 UNC coarse thread for compatibility with standard tapped holes and threaded inserts
• 3/8-inch hex socket drive for use with standard hex keys and socket drivers
• 2-3/4-inch length under head, partially threaded for shoulder-bearing clamping applications
• Alloy steel construction meets ASTM A574 high-strength requirements
• Black oxide coating reduces surface glare and provides light corrosion resistance
• Conforms to ASME B18.3 dimensional standards for socket cap screws

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in 1/2-13 UNC tapped holes across general industrial and mechanical assembly applications.

Installation Notes

Installation is typically performed by machinists, millwrights, or maintenance technicians using a 3/8-inch hex key or socket driver. Ensure the mating tapped hole is clean and free of debris before threading. De-energize and lock out any equipment before servicing fasteners on machinery per applicable OSHA lockout/tagout procedures. Do not exceed the torque capacity of the fastener as defined by ASTM A574 for the applicable thread size.