Value Collection 451138BR Hex Head Cap Screw 5/8-18 X 10 in

Product Description

The VALUE COLLECTION 451138BR is a Grade 8 steel hex head cap screw designed for high-strength fastening applications. Measuring 5/8-18 thread size with a 10-inch length under head, this fastener uses a Unified National Fine (UNF) thread standard and features partial threading along the shank. The bright, uncoated finish leaves the steel bare for applications where coating adhesion, plating, or post-installation treatment is planned. Manufactured to ASME B18.2.1 standards, it is suited for use in assemblies requiring precise dimensional and mechanical tolerances. A 5/16-inch hex key size applies for installation with standard hex drive tooling.

This cap screw is appropriate for heavy-duty mechanical assemblies, structural connections, and equipment fabrication where a fine-thread, high-tensile fastener is required. The Grade 8 rating indicates a minimum tensile strength suitable for demanding load-bearing joints. Partial threading allows the unthreaded shank to act as a locating feature in close-tolerance bores, making this fastener common in machinery, agricultural equipment, and industrial assemblies. It is installed by millwrights, maintenance mechanics, and fabricators working on steel structures and mechanical systems.

Key Features

• Grade 8 steel construction for high tensile strength in structural and mechanical applications
• 5/8-18 UNF thread size for fine-thread engagement and reduced vibration loosening
• 10-inch length under head accommodates thick stock and deep through-bolt configurations
• Partially threaded shank provides a smooth bearing surface in close-tolerance bores
• Bright/uncoated finish compatible with post-installation plating or coating processes
• Conforms to ASME B18.2.1 dimensional standards

Compatibility

Designed as a standard-dimension replacement or new-installation fastener for any assembly specifying a 5/8-18 UNF Grade 8 hex head cap screw with a 10-inch length under head per ASME B18.2.1.

Installation Notes

Installation should be performed by a qualified mechanic or fabricator using appropriate hex drive tooling sized to the 5/16-inch hex key specification. Always confirm mating thread condition, hole depth, and clamp length before driving the fastener. Apply thread lubricant or anti-seize as required by the assembly specification. Follow all applicable engineering drawings and torque specifications provided by the equipment manufacturer for Grade 8 fasteners of this diameter.