Holo-krome 72284 Hex Socket Cap Screw 5/8-11 Unc

Product Description

The HOLO-KROME 72284 is a partially threaded hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. Sized at 5/8-11 UNC with a 3.5-inch length under head, this fastener is driven with a 1/2-inch hex key. Constructed from alloy steel with a black oxide coating, it delivers corrosion resistance and a non-reflective finish suited for demanding environments. It meets ASME B18.3 and ASTM A574 standards, confirming its suitability for critical load-bearing connections where material strength and dimensional accuracy are required.

This screw is used in heavy-duty mechanical assemblies, machinery frames, tooling fixtures, and structural components where a recessed drive and high clamping force are needed. The partial threading allows the shank to act as a locating feature in precision fits. Machinists, millwrights, maintenance technicians, and mechanical contractors regularly specify this type of fastener for equipment assembly, fabrication, and repair work across industrial and commercial settings.

Key Features

• 5/8-11 UNC thread size for compatibility with standard inch-series tapped holes
• 3.5-inch length under head provides substantial grip length for thick-stack assemblies
• Partially threaded shank for precise hole location and shear resistance
• 1/2-inch hex drive socket for positive torque transfer with standard hex keys or T-handles
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide finish provides mild corrosion resistance and reduces surface glare

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any 5/8-11 UNC tapped hole application requiring a partially threaded alloy steel fastener with a 1/2-inch hex drive.

Installation Notes

Installation should be performed by qualified machinists or mechanical technicians using a calibrated torque wrench and a properly sized 1/2-inch hex key or socket bit. Ensure the mating tapped hole is clean, free of debris, and cut to correct depth before installation. Apply a thread lubricant or anti-seize compound appropriate for the service environment to achieve accurate clamp load. Power down and de-energize any equipment before accessing fastener locations on live machinery.