Value Collection D39445 Hex Head Cap Screw 5/8-18 X 1 in Grade 8

Product Description

The VALUE COLLECTION D39445 is a fully threaded hex head cap screw engineered to ASME B18.2.1 standards. It features a 5/8-18 UNF thread size with a 1-inch length under head, manufactured from Grade 8 steel for high-strength fastening applications. The zinc yellow dichromate finish provides corrosion resistance suitable for demanding mechanical and structural environments. This fastener is installed by machinists, millwrights, and maintenance technicians wherever a high-tensile, fine-thread hex cap screw is required. The Grade 8 rating indicates a tensile strength appropriate for heavy-duty bolted joints subject to dynamic or high-load conditions.

This screw is suited for industrial machinery assembly, automotive drivetrain work, heavy equipment maintenance, and structural fastening applications that require a fine-thread UNF pattern. The 5/8-18 thread pitch offers greater thread engagement per inch compared to coarse-thread equivalents, making it a preferred choice in applications where vibration resistance and precise torque control are critical. It is sold individually but carries a minimum order quantity of 10 units.

Key Features

• Grade 8 steel construction for high tensile strength in heavy-duty bolted connections
• Fully threaded 5/8-18 UNF fine-thread pattern for maximum thread engagement
• Zinc yellow dichromate finish for corrosion resistance in mechanical environments
• Meets ASME B18.2.1 dimensional standards for consistent fit and interchangeability
• 1-inch length under head suits standard flange, bracket, and machinery fastening applications

Compatibility

Designed as a standard ASME B18.2.1 hex head cap screw compatible with any 5/8-18 UNF tapped hole or matching nut requiring a Grade 8 fine-thread fastener.

Installation Notes

Installation is performed by machinists, millwrights, or qualified maintenance technicians using a standard hex wrench or socket set. Always verify the mating thread is 5/8-18 UNF before installation to avoid cross-threading. Follow the equipment manufacturer's torque specifications for Grade 8 fasteners of this diameter. De-energize and lock out any equipment before servicing fastened assemblies in accordance with applicable OSHA lockout/tagout procedures.