Holo-krome 73172 Hex Socket Cap Screw 5/8-18 Unf

Product Description

The HOLO-KROME 73172 is a hex socket cap screw designed for high-strength fastening in mechanical and structural assemblies. It features a 5/8-18 UNF thread with a 4.5-inch length under head and is partially threaded for precise engagement in tapped holes. The 1/2-inch hex drive accepts standard hex keys and allen wrenches. Constructed from alloy steel with a black oxide finish, this fastener meets ASME B18.3 and ASTM A574 standards. It is installed by mechanics, millwrights, pipefitters, and maintenance technicians working on equipment, fixtures, and industrial assemblies requiring a strong, reliable threaded connection.

This screw is suited for industrial, commercial, and mechanical applications where a recessed-drive, high-strength cap screw is required. Partial threading provides positive clamping force against mating surfaces in standard tapped-bore assemblies. The fine UNF thread pitch makes it appropriate for applications requiring tighter thread engagement and better resistance to loosening under vibration, such as machinery housings, equipment brackets, and precision mechanical components.

Key Features

• 5/8-18 UNF fine thread for improved vibration resistance and precise torque control
• 4.5-inch length under head for deep-reach fastening applications
• Partially threaded shank for full clamping force against mating surfaces
• 1/2-inch hex socket drive for use with standard hex keys or T-handle drivers
• Alloy steel construction meets ASTM A574 high-strength fastener specification
• Black oxide finish provides mild corrosion resistance and reduces light reflection in service

Compatibility

Designed for use in standard 5/8-18 UNF tapped holes per ASME B18.3 dimensional standards. Suitable as an OEM-style or maintenance replacement fastener in industrial equipment, mechanical assemblies, and structural fixtures requiring a high-strength socket cap screw.

Installation Notes

Installation is performed by qualified mechanics, millwrights, or maintenance technicians using a calibrated torque wrench and a properly sized 1/2-inch hex key or drive bit. De-energize and lock out all equipment before accessing fastener locations per applicable OSHA lockout/tagout procedures. Verify thread condition in the mating tapped hole before installation and clean threads of debris or contamination. Do not exceed the torque rating appropriate for the fastener grade and application as specified by the equipment manufacturer.