Value Collection MPKP44023 Hex Cap Screw 5/16-18 Grade 8 50pk

Product Description

The VALUE COLLECTION MPKP44023 is a Grade 8 steel hex head cap screw with a 5/16-18 UNC thread and a 1-1/2 inch length under head. Partially threaded and zinc-plated, this fastener meets ASTM A354 BD standards, making it suitable for high-strength structural and mechanical fastening applications. The zinc plating provides a baseline level of corrosion resistance for general indoor and light-duty outdoor use. Each package contains 50 pieces, supporting job-site and shop efficiency for installers working in volume.

These cap screws are used across a wide range of trade applications including HVAC equipment mounting, electrical enclosure assembly, plumbing fixture installation, and general mechanical fabrication. The 5/16-18 UNC thread is one of the most common coarse-thread fastener sizes found in residential and light commercial equipment. Partially threaded shanks are preferred when clamping two surfaces together without thread engagement in the upper material, which is typical in structural connections and flange joints.

Key Features

• Grade 8 steel construction meets ASTM A354 BD for high-strength fastening
• 5/16-18 UNC coarse thread for broad compatibility with standard tapped holes and nuts
• 1-1/2 inch length under head suits medium-depth clamping applications
• Partial threading provides a smooth shank section for improved clamp load and shear resistance
• Zinc-plated finish offers basic corrosion protection in dry or mildly humid environments
• Sold in a 50-piece package to support production and service work

Compatibility

Designed for use with standard 5/16-18 UNC threaded nuts, inserts, and tapped holes in steel, aluminum, and other machinable materials across general mechanical and trade assembly applications.

Installation Notes

Installation is typically performed by licensed HVAC technicians, electricians, plumbers, or general mechanical trades using a standard hex wrench, socket set, or impact driver with the appropriate 1/2 inch drive socket. Always ensure the mating threads are clean and free of debris before installation. Do not use zinc-plated fasteners in continuously wet, submerged, or highly corrosive environments without additional protective measures. Follow applicable codes and equipment manufacturer torque guidance when fastening structural or pressure-bearing assemblies.