Value Collection D30170-8 Hex Head Cap Screw 1-8x8 Grade 5

Product Description

The VALUE COLLECTION D30170-8 is a hex head cap screw designed for heavy-duty fastening applications in mechanical, industrial, and construction assemblies. This fastener measures 1-8 thread size with an 8-inch length under head, manufactured from Grade 5 steel with a zinc-plated finish for corrosion resistance in standard service environments. The partial threading follows UNC thread standards and meets ASME B18.2.1 dimensional requirements. Licensed tradespeople, millwrights, pipefitters, and general contractors rely on this grade of fastener where structural integrity and dimensional consistency are required.

This cap screw is suited for bolted connections in structural steel fabrication, equipment mounting, machinery assembly, and general industrial maintenance. The UNC thread form is the standard coarse-thread pitch widely used across North American mechanical applications. Its 8-inch length under head accommodates thick material stacks or long-reach clamping situations where shorter fasteners would not provide adequate thread engagement or clamping length.

Key Features

• Grade 5 steel construction meets minimum tensile and proof load requirements for medium-strength fastener applications
• Zinc-plated finish provides baseline corrosion protection in indoor and moderate-exposure environments
• Partially threaded shank allows shear load transfer through unthreaded body section
• UNC thread standard ensures broad compatibility with standard hex nuts, washers, and tapped holes
• Conforms to ASME B18.2.1 for dimensional accuracy and head geometry

Compatibility

Designed as a standard UNC hex head cap screw for use with 1-8 hex nuts, flat washers, and lock washers conforming to ASME and ANSI inch-series fastener standards.

Installation Notes

Installation is performed by mechanics, millwrights, or maintenance technicians using standard hex wrenches or impact tooling sized to the hex head. Always ensure mating threads are clean and undamaged before assembly. Apply thread lubricant or anti-seize only when specified by the equipment manufacturer, as this affects achieved clamp load. Verify torque requirements against applicable engineering specifications for the joint being assembled.