Value Collection D39414 Hex Head Cap Screw 1/2-20 Grade 8

Product Description

The VALUE COLLECTION D39414 is a partially threaded hex head cap screw intended for high-strength fastening applications in mechanical, structural, and industrial assemblies. 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 1/2-20 UNF thread and 3-1/2 inch length under head make it well suited for precision-fit bolted connections where fine thread engagement and controlled clamping force are required. It conforms to ASME B18.2.1 dimensional standards, ensuring consistent head geometry and thread form across production lots.

This fastener is used in demanding mechanical and structural installations where Grade 8 strength is specified, including equipment mounting, automotive drivetrain assemblies, heavy machinery, and fabricated steel structures. The fine UNF thread pitch provides greater thread engagement per inch compared to UNC, making it a common choice in applications subject to vibration or where precise torque control is critical. Sold in multiples of 10 per minimum order with a package quantity of 1.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• Zinc yellow dichromate finish provides corrosion resistance and visual identification
• 1/2-20 UNF fine thread for superior thread engagement and vibration resistance
• Partially threaded shank allows for controlled bearing load in bolted joints
• Conforms to ASME B18.2.1 for consistent dimensional compliance
• 3-1/2 inch length under head accommodates thicker material stacks

Compatibility

Designed as a standard ASME B18.2.1-compliant hex head cap screw suitable for any application requiring a 1/2-20 UNF Grade 8 partially threaded fastener.

Installation Notes

Installation should be performed by a qualified mechanic or tradesperson familiar with fastener torque specifications for Grade 8 hardware. Always use the appropriate hex socket or wrench size to avoid rounding the head. Verify that the mating nut or tapped hole is also rated for Grade 8 loading before assembly. Do not mix Grade 8 fasteners with lower-grade nuts or hardware in structural or load-bearing joints.