Value Collection MP39451 Hex Cap Screw 5/8-18 X 2-1/2 in Grade 8

Product Description

The VALUE COLLECTION MP39451 is a partially threaded hex head cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. Manufactured from Grade 8 steel with a zinc yellow dichromate finish, this fastener delivers superior tensile strength and corrosion resistance compared to lower-grade alternatives. The 5/8-18 UNF thread pitch paired with a 2-1/2-inch length under head makes it well suited for precision-fit bolted connections where fine-thread engagement and controlled clamping force are required. This screw conforms to ASME B18.2.1 dimensional standards. Sold in a package of 10.

This cap screw is used in a wide range of commercial and industrial fastening applications, including machinery assembly, equipment mounting, and structural bolted joints where high shear and tensile load capacity is critical. The fine UNF thread series provides greater thread engagement per inch than coarse-thread equivalents, making it a common choice in applications involving vibration or precise torque control. It is installed by millwrights, maintenance technicians, and mechanical contractors working on production equipment, heavy machinery, and fabricated assemblies.

Key Features

• Grade 8 steel construction for high tensile and proof load ratings
• Zinc yellow dichromate finish provides corrosion and abrasion resistance
• 5/8-18 UNF fine-thread series for precise engagement and vibration resistance
• Partially threaded shank allows for clean bearing surface in bolted joints
• Conforms to ASME B18.2.1 dimensional standards
• Packaged in quantities of 10 per unit

Compatibility

Designed as a standard ASME B18.2.1 hex head cap screw for use in inch-series bolted assemblies requiring a 5/8-18 UNF partially threaded fastener in Grade 8 steel.

Installation Notes

Installation should be performed by qualified mechanical or maintenance technicians following applicable torque and fastener specifications for the assembly. Always verify that the mating thread, material, and load requirements are compatible with Grade 8 steel fasteners before installation. Use appropriate hand tools or impact equipment rated for the fastener size. Ensure fastener and mating surfaces are clean and free of debris before assembly.