Holo-krome 72242 Hex Socket Cap Screw 1/2-13 Unc Alloy Steel

Product Description

The HOLO-KROME 72242 is a partially threaded hex socket cap screw designed for high-strength mechanical fastening in industrial and trade applications. It features a 1/2-13 UNC thread size and measures 3 inches in length under the head. The screw is driven with a 3/8-inch hex (Allen) key. Constructed from alloy steel with a black oxide finish, it meets ASME B18.3 and ASTM A574 standards, making it suitable for demanding load-bearing assemblies where tensile strength and corrosion resistance are priorities. Licensed tradespeople and maintenance technicians specify this type of fastener for structural and mechanical connections.

This screw is used in general industrial maintenance, machine assembly, equipment fabrication, and structural fastening where a recessed-drive cap screw is required. The partial threading allows the unthreaded shank to bear shear loads, a common requirement in precision machine components, jigs, fixtures, and equipment frames. It is appropriate for both light industrial and heavy mechanical applications where ASME B18.3 compliance is specified.

Key Features

• 1/2-13 UNC thread size for standard coarse-thread fastening
• 3 inches length under head with partial threading for shear-load capacity
• 3/8-inch hex drive for use with standard hex keys and socket tools
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as an OEM-style replacement or standard-specification hex socket cap screw for mechanical assemblies requiring 1/2-13 UNC coarse-thread fasteners per ASME B18.3.

Installation Notes

Installation should be performed by qualified mechanical or maintenance tradespeople using a calibrated torque wrench and the appropriate 3/8-inch hex key or socket bit. Clean and inspect the mating threaded bore before installation to ensure full thread engagement. Do not use impact tools without verified torque control, as overtorquing alloy steel socket cap screws can cause thread stripping or fastener failure. Follow applicable torque specifications from the equipment manufacturer or relevant industry standards.