Value Collection D39030 Hex Head Cap Screw 5/16-18 Grade 8

Product Description

The VALUE COLLECTION D39030 is a fully threaded hex head cap screw designed for high-strength fastening applications in mechanical, structural, and equipment assembly work. Manufactured from 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 1-1/4 inch length under head make it a common choice for secure bolted connections where vibration resistance and load-bearing performance are required. It conforms to ASME B18.2.1 and SAE J429 standards. Installation is typically performed by maintenance technicians, millwrights, HVAC installers, and general tradespeople working with inch-series fasteners.

This cap screw suits a wide range of industrial, commercial, and trade applications including equipment mounting, bracket fastening, and structural assembly. The fully threaded shank provides maximum thread engagement across the full length of the fastener, making it well suited for thinner material connections and through-bolt configurations. The zinc yellow dichromate finish provides a recognizable visual indicator of Grade 8 specification while offering a baseline level of corrosion protection for indoor and light-duty outdoor environments.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• Fully threaded shank for maximum thread engagement along the entire length
• 5/16-18 UNC thread form for compatibility with standard inch-series nuts and tapped holes
• Zinc yellow dichromate finish provides corrosion resistance and Grade 8 visual identification
• Meets ASME B18.2.1 and SAE J429 dimensional and mechanical standards

Compatibility

Designed as a standard inch-series hex head cap screw for use with 5/16-18 UNC nuts, inserts, and tapped holes in steel, aluminum, and similar structural materials.

Installation Notes

Installation is performed using a standard hex wrench, socket, or open-end wrench sized for a 5/16-18 fastener. Ensure mating threads are clean and free of debris before installation. Apply thread lubricant or thread-locking compound as required by the application or governing specification. Always torque to the value specified by the equipment manufacturer or applicable mechanical standard for Grade 8 fasteners of this size.