Armor Coat UST235951 Hex Socket Cap Screw 5/16-18 Unc

Product Description

The ARMOR COAT UST235951 is a hex socket cap screw designed for fastening applications that demand a secure, corrosion-resistant connection. Manufactured from alloy steel with an Armor Coat finish, this screw meets ASME B18.3 standards. It features a 5/16-18 UNC thread size, a 4-inch length under head, and a 1/4-inch hex drive. The partial threading allows for consistent clamping force across a range of material thicknesses. This fastener is installed by HVAC technicians, plumbers, electricians, and general mechanical tradespeople in both new construction and service work.

This screw is suited for use in mechanical assemblies, equipment mounting, and structural fastening where a recessed hex drive is preferred for torque control and a low-profile head is required. The Armor Coat finish provides corrosion resistance in environments with moderate moisture exposure, making it appropriate for indoor mechanical rooms, equipment panels, and similar service areas.

Key Features

• 5/16-18 UNC thread form for compatibility with standard inch-series tapped holes
• 4-inch length under head provides reach for deeper assemblies
• Partial threading allows positive clamping on through-bolted connections
• 1/4-inch hex socket drive for use with standard hex keys or socket drivers
• Armor Coat finish for corrosion resistance in moderate-duty environments
• Meets ASME B18.3 dimensional standards for quality assurance

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any application requiring a 5/16-18 UNC partially threaded fastener with a 1/4-inch hex drive and 4-inch length under head.

Installation Notes

Install using a 1/4-inch hex key or socket driver rated for the required torque. Ensure the mating tapped hole is clean and free of debris before driving the fastener. Power down or de-energize any equipment before fastening components on electrical or mechanical panels. Follow applicable industry standards for fastener torque requirements specific to the assembly material and design.