Value Collection R80320494 Hex Head Cap Screw 18-8 Ss

Product Description

The VALUE COLLECTION R80320494 is a 1-1/8-7 UNC hex head cap screw with a 3-inch length under head, manufactured from 18-8 stainless steel with no coating applied. The partially threaded shank provides a bearing surface that resists joint movement while the unthreaded grip area maintains clamping load under vibration. 18-8 stainless offers solid corrosion resistance in wet and outdoor service environments without the cost of higher-alloy grades. This fastener is installed by plumbers, pipefitters, HVAC technicians, and general mechanical contractors wherever a large-diameter, corrosion-resistant bolted connection is required.

This cap screw is suited for heavy mechanical assemblies, pipe flange connections, equipment mounting, and structural fastening applications in both residential and light commercial construction. The inch-series UNC thread form is the standard for most North American trade work. The large 1-1/8-inch diameter makes this fastener appropriate for high-load joints where smaller hardware would be undersized. It is used wherever code or engineering requirements call for stainless steel hardware to prevent galvanic corrosion or rust staining in exposed or damp installations.

Key Features

• 18-8 stainless steel construction resists corrosion in wet, outdoor, and chemically mild environments
• Partially threaded shank maintains clamping load and resists joint loosening under vibration
• 1-1/8-7 UNC thread form matches standard North American inch-series tapped holes and nuts
• Uncoated finish is suitable for direct contact with stainless or compatible metals without galvanic mismatch
• 3-inch length under head accommodates thick flanges, gussets, and stacked components

Compatibility

Designed as a standard inch-series UNC hex head cap screw for use with any 1-1/8-7 tapped hole or compatible heavy hex nut in mechanical, plumbing, and HVAC structural fastening applications.

Installation Notes

Installation typically requires a hex socket or open-end wrench sized for a 1-1/8-inch UNC heavy hex head. De-energize or depressurize the assembly before removing or replacing fasteners in live systems. Apply an appropriate anti-seize compound when mating 18-8 stainless fasteners to stainless tapped holes to prevent galling during installation. Follow applicable mechanical and structural codes for torque requirements specific to the joint design.