Value Collection D39037 Hex Head Cap Screw 5/16-18 X 3 in

Product Description

The VALUE COLLECTION D39037 is a Grade 8 steel hex head cap screw with a 5/16-18 UNC thread and a 3-inch length under head. It features a zinc yellow dichromate finish that provides corrosion resistance in demanding service environments. The screw is partially threaded and manufactured to ASME B18.2.1 dimensional standards. It is suited for high-strength fastening applications in industrial, mechanical, and trade assembly work where Grade 8 tensile requirements must be met. Electricians, millwrights, HVAC technicians, and plumbers regularly use Grade 8 fasteners for equipment mounting and structural connections.

This fastener is appropriate for general industrial and commercial applications requiring a high-strength inch-series cap screw. The 5/16-18 UNC coarse thread is widely used in steel fabrication, equipment frames, bracket mounting, and mechanical assemblies. The partial threading allows the unthreaded shank to bear shear loads, making it well suited for connections where shank strength and precise fit are important. The zinc yellow dichromate finish adds a secondary layer of protection against oxidation in both indoor and moderately exposed outdoor installations.

Key Features

• Grade 8 steel construction meets high-strength tensile and proof load requirements
• 5/16-18 UNC coarse thread for broad compatibility with standard inch-series nuts and tapped holes
• 3-inch length under head with partial threading to support shear-bearing shank applications
• Zinc yellow dichromate finish provides corrosion resistance over bare steel
• Manufactured to ASME B18.2.1 dimensional standards for consistent fit and interchangeability

Compatibility

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

Installation Notes

Install using the appropriate hex wrench or socket drive sized for the 5/16-18 head. Ensure mating threads are clean and free of debris before assembly. Apply thread lubricant or anti-seize only when specified by the equipment manufacturer, as dry torque values differ from lubricated values. Grade 8 fasteners should not be substituted with lower-grade hardware in structural or high-load applications.