Holo-krome 72254 Hex Socket Cap Screw 1/2-13 Unc Alloy Steel

Product Description

The HOLO-KROME 72254 is a hex socket cap screw designed for high-strength mechanical fastening in industrial and commercial applications. It features a 1/2-13 UNC thread size, a 5-1/2-inch length under head, and a 3/8-inch hex drive for use with a standard hex key or Allen driver. The fastener is manufactured from alloy steel and finished with a black oxide coating that provides mild corrosion resistance and reduces light reflection. Partially threaded along its length, it is suited for clamped-joint assemblies where full threading would compromise clamp load or shear strength. It conforms to ASME B18.3 and ASTM A574 standards.

This cap screw is used in structural fastening, machine assembly, tooling fixtures, and equipment maintenance across manufacturing, industrial maintenance, and mechanical contracting trades. The partially threaded shank allows the screw to draw mating parts firmly together without thread engagement in the grip zone, which is critical in precision assemblies and heavy-duty clamping applications. It is appropriate for use wherever a high-tensile, socket-drive fastener is required in steel or ferrous assemblies.

Key Features

• 1/2-13 UNC thread for compatibility with standard inch-series tapped holes
• 5-1/2-inch length under head for deep-reach or thick-stack fastening
• 3/8-inch hex drive accepts standard Allen keys and hex bit drivers
• Partially threaded shank maintains full grip-length clamping in bolted joints
• Alloy steel construction meets ASTM A574 high-strength requirements
• Black oxide finish provides mild corrosion resistance and a clean appearance
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as a standard ASME B18.3 inch-series hex socket cap screw for use in any tapped or through-hole assembly requiring a 1/2-13 UNC fastener with a partially threaded shank.

Installation Notes

Installation is performed with a 3/8-inch hex key or socket-drive Allen bit; use of the correct drive size prevents rounding of the socket. Ensure mating tapped holes are clean and meet the ASME B18.3 thread engagement depth requirements before installation. Apply appropriate thread lubricant or thread-locking compound per the assembly specification. Do not exceed the rated torque for a 1/2-13 ASTM A574 fastener as defined by the applicable engineering standard.