Value Collection 99159 Hex Head Cap Screw 5/8-11 X 5 in Grade 8

Product Description

The VALUE COLLECTION 99159 is a partially threaded hex head cap screw sized 5/8-11 x 5 inches, manufactured from Grade 8 steel with no surface coating. Grade 8 steel delivers high tensile and proof load strength, making this fastener suitable for demanding structural and mechanical assemblies. The coarse UNC thread profile (5/8-11) provides reliable clamp load in standard tapped holes and nuts. The uncoated finish is appropriate for assemblies where a secondary coating or plating will be applied on-site, or where bare steel is acceptable. This fastener meets ASME B18.2.1 dimensional standards and is sold in packages of 25.

This cap screw is used in heavy-duty mechanical, structural, and equipment assembly applications where high-strength fasteners are required. Typical installation scenarios include mounting brackets, machinery frames, flanged joints, and structural steel connections in industrial and commercial settings. The partial thread design allows for a full-shank grip zone beneath the head, which is important in joints where the fastener passes through clearance holes and the threads engage only in the clamped material or nut. Licensed tradespeople and maintenance mechanics working on HVAC equipment bases, pump skids, compressor mounts, and similar assemblies commonly use this fastener type.

Key Features

• Grade 8 steel construction provides high proof load and tensile strength for demanding fastening applications
• 5/8-11 UNC coarse thread ensures broad compatibility with standard nuts and tapped holes
• Partially threaded shank maintains a grip zone for shear-loaded or clearance-hole joint designs
• Uncoated finish suited for assemblies requiring field-applied coatings or bare steel contact
• Meets ASME B18.2.1 dimensional standards for hex head cap screws
• Sold in a package of 25 for job-lot quantities

Compatibility

Designed for use with standard 5/8-11 UNC hex nuts, jam nuts, and tapped holes conforming to ASME and ANSI inch-series thread standards.

Installation Notes

Installation should be performed by a qualified mechanic or tradesperson using a properly sized socket or wrench. Always ensure mating threads are clean, undamaged, and free of debris before assembly. Follow applicable torque specifications from the equipment manufacturer or a recognized fastener torque standard for Grade 8 fasteners of this diameter. Do not reuse fasteners that show signs of thread damage, corrosion, or deformation.