Value Collection C703068 Hex Head Cap Screw 5/16-18 Grade 8

Product Description

The VALUE COLLECTION C703068 is a Grade 8 steel hex head cap screw with a 5/16-18 UNC thread and a 2-1/4 inch length under head. Partially threaded and left uncoated, it is designed for high-strength fastening applications where a bare steel finish is acceptable. Grade 8 steel provides significantly higher tensile and proof load ratings than standard Grade 5 hardware, making it appropriate for demanding mechanical assemblies. This screw conforms to ASME B18.2.1 dimensional standards, ensuring consistent head geometry and thread engagement across production runs. Maintenance technicians, millwrights, and mechanical contractors are the typical installers for hardware of this specification.

This screw is suited for use in structural and mechanical assemblies requiring high-strength inch-series fasteners. The 5/16-18 UNC thread pattern is widely used in equipment frames, brackets, housings, and mounting hardware across industrial, HVAC, and general mechanical applications. The partial threading allows the unthreaded shank to bear shear loads in close-tolerance bores. This part is sold in a package quantity of 50 pieces.

Key Features

• Grade 8 steel construction for high tensile and proof load performance
• 5/16-18 UNC thread for broad compatibility with standard inch-series nuts and tapped holes
• Partially threaded shank to handle shear loads in close-tolerance applications
• Uncoated finish suitable for assemblies where additional coating is applied post-installation or not required
• Conforms to ASME B18.2.1 for consistent dimensional compliance
• Sold in a 50-piece package for job-lot quantities

Compatibility

Designed as a standard inch-series hex head cap screw for use with any 5/16-18 UNC tapped hole or compatible hex nut meeting ASME B18.2.1 dimensional requirements.

Installation Notes

Installation should be performed by a qualified mechanic or tradesperson familiar with fastener torque specifications for Grade 8 hardware at the 5/16-18 thread size. Always consult the equipment manufacturer or a standard fastener torque table for the correct clamp load target. Ensure mating threads are clean and free of damage before assembly. Do not mix Grade 8 fasteners with lower-grade nuts unless explicitly approved by the equipment manufacturer.