Value Collection KP44120 Hex Head Cap Screw 5/8-11 X 3.5 in Grade 8

Product Description

The VALUE COLLECTION KP44120 is a partially threaded hex head cap screw sized 5/8-11 x 3.5 inches, manufactured from Grade 8 steel with a zinc-plated finish. Grade 8 is among the highest strength classifications for inch-series fasteners, making this screw suitable for high-load structural and mechanical connections. The zinc plating provides a baseline level of corrosion resistance for indoor and light-duty outdoor applications. This fastener follows the Unified National Coarse (UNC) thread standard and meets ASTM A354 Grade BD specifications, which govern quenched and tempered alloy steel bolts for structural and mechanical use. It is installed by millwrights, ironworkers, industrial mechanics, and maintenance technicians across a wide range of assembly and fabrication applications.

This cap screw is suited for use in structural steel connections, heavy equipment assembly, machinery mounting, and general industrial fastening where a high-tensile-strength UNC fastener is required. The partial threading allows the unthreaded shank to bear shear loads in close-tolerance holes, a common requirement in bolted flange joints, bracket mounting, and machine bases. It ships in a package quantity of 25 pieces, making it practical for both single-job use and small-volume stock replenishment in trade and maintenance settings.

Key Features

• Grade 8 steel construction for high tensile and proof-load strength in demanding fastening applications
• Partially threaded shank allows the bolt body to carry shear loads in precision-fit assemblies
• 5/8-11 UNC thread form for compatibility with standard inch-series nuts and tapped holes
• Zinc-plated finish provides baseline corrosion resistance and improves surface appearance
• Meets ASTM A354 Grade BD specification for quenched and tempered alloy steel fasteners
• Sold in a package quantity of 25 pieces

Compatibility

Designed for use with standard 5/8-11 UNC nuts, washers, and tapped holes in inch-series fastener applications conforming to ASTM A354 BD requirements.

Installation Notes

Installation is performed by qualified mechanics, millwrights, or maintenance technicians using a standard hex wrench or impact driver fitted with the appropriate 15/16-inch socket. Always consult the applicable structural or equipment specification for required torque values before installation, as Grade 8 fasteners have specific minimum preload requirements. Inspect threads on both the bolt and mating nut or tapped hole for damage before assembly. Do not substitute a lower-grade nut or threaded component in high-load applications governed by ASTM or structural codes.