Value Collection 99161 Hex Head Cap Screw 5/8-11 X 6 in Grade 8

Product Description

The VALUE COLLECTION 99161 is a partially threaded hex head cap screw designed for high-strength fastening applications across mechanical, structural, and industrial assemblies. Manufactured from Grade 8 steel with no coating applied, this fastener delivers the high tensile and proof load values that Grade 8 classification requires. The 5/8-11 UNC thread size and 6-inch length under head make it well suited for thick material assemblies where a full-grip shank is needed before threads engage. Licensed trade professionals and industrial maintenance technicians rely on this screw where fastener grade integrity is critical to joint performance.

This cap screw is used in heavy-duty mechanical assemblies, equipment mounting, structural steel connections, and industrial maintenance applications. Its partial threading is intentional, providing a smooth shank section that resists shear loading along the bearing length of the joint. The inch-system sizing and UNC thread form align with standard North American tooling and tapping specifications, making it a straightforward drop-in for new builds and repair work in manufacturing, construction, and general trade environments.

Key Features

• Grade 8 steel construction meets high tensile, yield, and proof load requirements for demanding fastening applications
• Partially threaded design provides a smooth shank section for improved shear resistance in bolted joints
• 5/8-11 UNC thread form compatible with standard North American inch-system nuts and tapped holes
• Uncoated finish suitable for use as-is or for post-installation treatment where required
• Conforms to ASME B18.2.1 dimensional standards for hex head cap screws
• 6-inch length under head accommodates thick material stacks requiring extended grip length

Compatibility

Designed as a standard inch-system hex head cap screw for use with 5/8-11 UNC nuts, washers, and tapped holes in steel and compatible structural assemblies conforming to ASME B18.2.1.

Installation Notes

Installation should be performed by qualified mechanical or structural tradespeople using calibrated torque tools appropriate for Grade 8 fasteners at 5/8-11 sizing. De-energize and lock out any equipment before fastener service in powered assemblies. Use hardened flat washers under the head and nut bearing surfaces to protect the joint and distribute clamping load. Follow applicable codes and engineering specifications for joint design, torque values, and inspection requirements.