Holo-krome 72288 Hex Socket Cap Screw 5/8-11 Unc Alloy Steel

Product Description

The HOLO-KROME 72288 is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, industrial equipment, and structural connections. It features a 5/8-11 UNC thread size with a 4.5-inch length under the head and is partially threaded for secure clamping force in thick material stacks. The 0.5-inch hex drive socket accepts a standard Allen wrench or hex bit driver. Manufactured from alloy steel with a black oxide finish, this screw provides reliable corrosion resistance and meets ASME B18.3 and ASTM A574 standards. It is a common choice for maintenance technicians, millwrights, and mechanical contractors working on heavy equipment and fabricated assemblies.

This screw is suited for use in industrial machinery, steel fabrication, equipment mounting, and structural fastening where a recessed-drive cap screw is required. The coarse 5/8-11 UNC thread pattern is appropriate for standard steel tapped holes and is widely used in both OEM manufacturing and field repair scenarios. The black oxide finish reduces surface reflectivity and provides light corrosion protection in dry or lightly oiled environments. Trades that commonly install this fastener include millwrights, pipefitters, and general mechanical contractors.

Key Features

• 5/8-11 UNC coarse thread for use in standard steel tapped holes
• 4.5-inch length under head with partial threading for clamping in thick material
• 0.5-inch hex socket drive for Allen wrench or hex bit installation
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide finish provides light corrosion resistance and low surface reflectivity
• Conforms to ASME B18.3 dimensional standard for socket cap screws

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw compatible with 5/8-11 UNC tapped holes in steel, iron, and other ferrous materials used in industrial and mechanical assemblies.

Installation Notes

Installation requires a 0.5-inch hex key or Allen driver; a calibrated torque wrench is recommended to achieve proper clamp load without overstressing the fastener. Ensure the mating tapped hole is clean, free of debris, and properly threaded to 5/8-11 UNC specification before installation. Apply thread lubricant or anti-seize compound as required by the applicable maintenance specification or engineering drawing. De-energize and lock out all equipment before performing any fastener service on live machinery.