Value Collection 99164 Hex Head Cap Screw 5/8-11 X 7-1/2 in Grade 8

Product Description

The VALUE COLLECTION 99164 is a Grade 8 steel hex head cap screw sized at 5/8-11 thread and 7-1/2 inches in length under head. It is partially threaded along the shank and left uncoated, making it suited for high-strength bolted assemblies where a bare steel finish is acceptable. Grade 8 steel provides a high tensile and proof load rating compared to lower-grade fasteners, and the UNC thread form ensures broad compatibility with standard inch-system tapped holes and nuts. Machinists, millwrights, fabricators, and maintenance mechanics are the primary installers of this fastener type.

This screw is used in general industrial, structural, and mechanical assembly applications requiring a high-strength inch-series hex cap screw. The 5/8-11 UNC thread and 7-1/2-inch body length make it appropriate for through-bolt applications with significant grip length, such as heavy equipment frames, steel structures, machinery mounts, and fixture assemblies. It is sold in packages of 10 units and conforms to ASME B18.2.1, the governing dimensional standard for inch hex cap screws.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• 5/8-11 UNC thread form compatible with standard inch-series nuts and tapped holes
• 7-1/2-inch length under head suits deep grip or through-bolt applications
• Partially threaded shank provides a smooth bearing surface along the unthreaded portion
• Uncoated finish — suitable for dry indoor assemblies or where field coating will be applied
• Meets ASME B18.2.1 dimensional standards for hex cap screws

Compatibility

Designed as a standard inch-series hex head cap screw for use with 5/8-11 UNC nuts, washers, and tapped holes in Grade 8 or equivalent high-strength bolted connections.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using standard combination wrenches, impact wrenches, or torque wrenches appropriate for 5/8-inch hex fasteners. Always torque to the specification required by the joint design engineer or applicable structural code, not a generic value. Inspect threads for damage before installation and ensure the mating tapped hole or nut matches the 5/8-11 UNC thread form. Do not substitute a lower-grade nut or fastener in a Grade 8 joint without engineering approval.