Value Collection D39034 Hex Head Cap Screw 5/16-18 X 2-1/4 in Grade 8

Product Description

The VALUE COLLECTION D39034 is a 5/16-18 hex head cap screw designed for high-strength fastening applications. Manufactured from Grade 8 steel with a zinc yellow dichromate finish, this fastener delivers superior tensile strength and corrosion resistance compared to lower-grade alternatives. The screw measures 2.25 inches in length under the head with a partially threaded shank, conforming to ASME B18.2.1 dimensional standards. The UNC thread form ensures broad compatibility with standard tapped holes and nuts. Maintenance technicians, millwrights, and field service professionals commonly use Grade 8 fasteners where joint integrity under vibration or heavy load is a priority.

This cap screw is suited for mechanical assemblies, equipment mounting, structural bracketing, and general industrial fastening where a high-strength inch-series fastener is required. The partially threaded shank provides a bearing surface in the joint, making it appropriate for applications that benefit from shank-to-hole contact rather than full thread engagement through the grip length. It is sold individually, with a minimum order quantity of 25 pieces.

Key Features

• Grade 8 steel construction provides high tensile and proof load strength for demanding fastening applications
• Zinc yellow dichromate finish offers corrosion resistance and is visually distinct from lower-grade hardware
• Partially threaded shank conforms to ASME B18.2.1 for dimensional consistency
• 5/16-18 UNC thread size ensures compatibility with standard inch-series tapped holes and nuts
• 2.25-inch length under head suits medium-depth fastening applications with adequate grip length

Compatibility

Designed as a standard inch-series hex head cap screw compatible with 5/16-18 UNC tapped holes, standard hex nuts, and flat washers conforming to ASME B18.2.1 specifications.

Installation Notes

Installation is typically performed by maintenance technicians, millwrights, or mechanical contractors using a standard hex wrench or socket set. Always confirm the mating thread is 5/16-18 UNC and that the tapped hole depth accommodates the partially threaded shank before installation. Follow applicable torque specifications from the equipment manufacturer or a recognized fastener torque table for Grade 8 hardware. De-energize and isolate any equipment before performing fastener service on live machinery.