Value Collection D39042 Hex Head Cap Screw 5/16-18 X 5 in

Product Description

The VALUE COLLECTION D39042 is a partially threaded hex head cap screw designed for high-strength fastening applications. Built to Grade 8 steel with a zinc yellow dichromate finish, this fastener delivers superior tensile strength and corrosion resistance compared to lower-grade hardware. The 5/16-18 UNC thread profile and 5-inch length under head make it well suited for medium-duty structural and mechanical assemblies. It conforms to ASME B18.2.1 dimensional standards, ensuring consistent fit and interchangeability with standard hex tooling. Licensed trades and maintenance professionals rely on this grade for critical joints where fastener failure is not an option.

This screw is appropriate for use in industrial equipment assembly, structural steel connections, machinery maintenance, and general mechanical fabrication where a Grade 8 fastener is specified. The partial threading allows the unthreaded shank to pass cleanly through a clearance hole before engaging the threaded receiver, which is common in bolted joint designs requiring shear resistance. It is sold individually but subject to a minimum order quantity of 25 pieces.

Key Features

• Grade 8 steel construction provides high proof load and tensile strength for demanding fastening applications
• Zinc yellow dichromate finish offers corrosion protection and is visually identifiable as a Grade 8 fastener
• Partially threaded shank supports shear-loaded joints and clean passage through clearance holes
• 5/16-18 UNC thread form is compatible with standard inch-series hex nuts and threaded inserts
• Conforms to ASME B18.2.1 for dimensional consistency and interchangeability
• 5-inch length under head accommodates thicker material stacks and longer grip lengths

Compatibility

Designed as an OEM-style replacement or direct-use fastener for any application specifying a 5/16-18 UNC x 5-inch Grade 8 hex head cap screw per ASME B18.2.1.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or maintenance technician using a properly sized hex wrench or socket. Torque to the value specified in the engineering documentation for the assembly being serviced — do not apply a generic torque value without confirming the joint design. Always inspect the mating threaded component for thread damage before installation, and use a flat washer under the head where surface bearing area is insufficient. Zinc dichromate finish is not rated for sustained immersion or highly corrosive environments without additional protection.