Value Collection 99150 Hex Cap Screw 5/8-11 Grade 8 25 Pack

Product Description

The VALUE COLLECTION 99150 is a partially threaded hex head cap screw in the 5/8-11 thread size, measuring 2.25 inches under the head. Manufactured from Grade 8 steel with no coating applied, this fastener delivers the high tensile strength required for heavy-duty bolted assemblies. The coarse UNC thread form seats reliably in standard tapped holes and mating nuts. Compliance with ASME B18.2.1 ensures consistent head dimensions and mechanical properties across production lots. This fastener is appropriate for structural, mechanical, and equipment assembly applications handled by millwrights, maintenance technicians, and trade professionals who specify Grade 8 fastener strength.

The 99150 hex head cap screw is suited for bolted connections in industrial equipment, heavy machinery frames, structural steel assemblies, and general mechanical fabrication where Grade 8 tensile and proof-load ratings are required. The 5/8-11 UNC thread is a widely used coarse-pitch size compatible with standard hardware and tooling. The partial thread configuration is typical for applications requiring a clamping grip length under the head. This listing provides a package quantity of 25 pieces, making it practical for small project runs or stock replenishment.

Key Features

• Grade 8 steel construction provides high tensile strength for heavy-duty bolted joints
• 5/8-11 UNC coarse thread for compatibility with standard nuts and tapped holes
• 2.25-inch length under head suits a range of clamping depths
• Partially threaded shank provides a grip length for clamping without full thread engagement through the joint
• Uncoated finish — suitable for environments where coating or plating is specified separately or not required
• Meets ASME B18.2.1 for dimensional and mechanical consistency

Compatibility

Designed as a standard inch-series hex head cap screw suitable for use with 5/8-11 UNC nuts, washers, and tapped holes conforming to ASME and ANSI standards in mechanical and structural assemblies.

Installation Notes

Installation is performed by millwrights, maintenance technicians, or trade professionals using standard 15/16-inch hex wrenches or impact tooling rated for Grade 8 fasteners. Always use appropriate flat washers and hardened nuts rated to match the Grade 8 proof load. Follow applicable torque specifications from engineering drawings or fastener standards before final tightening. Inspect mating threads for damage or contamination before assembly to ensure full thread engagement and joint integrity.