Value Collection 451137BR Hex Head Cap Screw 5/8-18 Grade 8

Product Description

The VALUE COLLECTION 451137BR is a partially threaded hex head cap screw designed for high-strength fastening applications in mechanical, structural, and industrial assemblies. Built to Grade 8 steel specifications, this fastener delivers superior tensile strength compared to lower-grade hardware. The bright uncoated finish exposes the bare steel surface, making it a standard choice where coating thickness or chemical compatibility is a concern. It measures 5/8-18 thread size with a 9-1/2 inch length under the head and conforms to ASME B18.2.1 standards. Installation requires a 5/16 inch hex key or appropriate socket drive. Tradespeople and maintenance technicians reach for Grade 8 fasteners when joint integrity under heavy load or vibration is required.

This cap screw suits residential and commercial mechanical installations, heavy equipment maintenance, structural framing connections, and industrial machinery assembly. The UNF thread standard and ASME B18.2.1 compliance make it a recognized fit for precision-threaded applications where fine-thread engagement is specified. Partial threading allows full shank engagement through clearance holes before the threaded section bites into the mating component, which is common in bolted flange and clevis-type connections.

Key Features

• Grade 8 steel construction for high tensile strength under load and vibration
• Partially threaded shank for accurate shear-load positioning through clearance holes
• UNF 5/8-18 thread standard for fine-pitch precision engagement
• Bright uncoated finish — no coating interference with dimensional tolerances
• Conforms to ASME B18.2.1 dimensional standards
• 5/16 inch hex key size for drive compatibility

Compatibility

Designed as a standard ASME B18.2.1 inch-series hex head cap screw suitable for any application specifying a 5/8-18 UNF Grade 8 partially threaded fastener.

Installation Notes

Installation is typically performed by millwrights, mechanical contractors, or maintenance technicians using a properly rated socket or hex drive tool. Always verify that the mating nut or threaded hole is rated for Grade 8 load requirements before torquing. Follow the applicable fastener torque specifications from the equipment manufacturer or a recognized fastener standard — no torque value is specified here. Inspect threads for damage before installation and never substitute lower-grade hardware in Grade 8 applications.