Value Collection D39221 Hex Head Cap Screw 1-8x4 Grade 8

Product Description

The VALUE COLLECTION D39221 is a Grade 8 steel hex head cap screw in a 1-8 UNC thread size with a 4-inch length under head. It is partially threaded and finished with a zinc yellow dichromate coating for corrosion resistance. This fastener meets ASME B18.2.1 dimensional standards, making it a reliable choice for structural and mechanical assemblies that require high-strength hardware. Licensed tradespeople in HVAC, plumbing, electrical, and general mechanical work reach for Grade 8 hex cap screws when joints must resist shear and tensile loads in demanding service conditions.

This hex head cap screw is suited for heavy-duty bolted connections in industrial, commercial, and trade applications. The partial threading allows for a stronger grip in through-bolt and clearance-hole installations. The zinc yellow dichromate finish provides a baseline level of protection against moisture and mild corrosion in indoor and sheltered outdoor environments. It is sold individually with a minimum order quantity of 10 units.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• 1-8 UNC thread standard for broad tooling compatibility
• 4-inch length under head with partial threading for clearance-hole installations
• Zinc yellow dichromate finish for corrosion resistance
• Meets ASME B18.2.1 dimensional standards

Compatibility

Designed as a standard 1-8 UNC Grade 8 hex head cap screw compatible with any application requiring ASME B18.2.1 compliant fasteners in that thread size and length.

Installation Notes

Installation should be performed by a qualified tradesperson using the appropriate hex wrench or socket set sized for the fastener head. Ensure mating threads are clean and free of debris before assembly. Apply thread lubricant or anti-seize as required by the application specification. Follow all applicable torque guidelines from the equipment manufacturer or relevant industry standards.