Holo-krome 72278 Hex Socket Cap Screw 5/8-11 Unc Alloy Steel

Product Description

The HOLO-KROME 72278 is a hex socket cap screw designed for high-strength fastening applications where a flush or recessed drive is required. It features a 5/8-11 UNC thread, a 2.75-inch length under head, and is driven by a 1/2-inch hex key. The screw is partially threaded, alloy steel construction with a black oxide coating for corrosion resistance. It conforms to ASME B18.3 and ASTM A574 standards, making it suitable for structural and mechanical assemblies. Machinists, millwrights, and industrial maintenance technicians are the typical installers for this fastener type.

This screw is used in industrial machinery, jigs and fixtures, die sets, and mechanical assemblies where a strong, tamper-resistant socket head fastener is needed. The partially threaded shank provides a bearing surface in clearance holes, which helps with accurate part alignment and joint clamping. It is suited for both light manufacturing environments and heavy industrial applications requiring ASME and ASTM-compliant hardware.

Key Features

• 5/8-11 UNC thread for standard inch-series fastening
• 2.75-inch length under head, partially threaded shank
• 1/2-inch hex socket drive for torque-efficient installation
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide coating provides mild corrosion resistance and reduces light reflection
• Conforms to ASME B18.3 dimensional standard

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any application requiring a 5/8-11 UNC partially threaded socket head fastener in alloy steel.

Installation Notes

Installation is performed with a 1/2-inch hex key or Allen driver; use a calibrated torque wrench when torque specifications are defined by the equipment manufacturer. Ensure mating threads are clean and free of debris before installation. De-energize and lock out any machinery before replacing or installing fasteners on powered equipment per applicable OSHA lockout/tagout procedures.