Value Collection D39229 Hex Cap Screw 1-8 Unc 8 in Grade 8

Product Description

The VALUE COLLECTION D39229 is a partially threaded hex head cap screw intended for heavy-duty fastening applications in industrial, mechanical, and trade environments. It is manufactured from Grade 8 alloy steel, which provides high tensile strength and resistance to shear loads. The fastener carries a zinc yellow dichromate finish that offers corrosion resistance in demanding service conditions. With a 1-8 UNC thread form and an 8-inch length under head, this screw is suited for thick structural assemblies where a full-thread fastener would be inadequate. Installation is performed with a standard hex wrench or impact driver sized to the 1-1/2 inch hex drive. Machinists, millwrights, and field mechanics commonly specify this grade and configuration.

This cap screw is used in heavy structural bolting, machinery assembly, and equipment fabrication where Grade 8 strength is required. The partial thread allows for shank engagement through clearance holes before threading into the receiving member, making it appropriate for bolted joint assemblies with a nut or tapped blind hole. It is commonly found in industrial plant maintenance, agricultural equipment repair, and general mechanical construction. The 1-8 UNC thread is a coarse-pitch standard widely used in North American fastener applications.

Key Features

• Grade 8 alloy steel construction for high tensile and proof load capacity
• Zinc yellow dichromate finish for corrosion protection
• 1-8 UNC coarse-thread form per ASME B18.2.1
• 8-inch length under head with partial thread for shank clearance applications
• 1-1/2 inch hex drive compatible with standard wrenches and impact tools

Compatibility

Designed as an OEM-style replacement or direct-use fastener for structural and mechanical assemblies requiring a 1-8 UNC partially threaded hex head cap screw with Grade 8 alloy steel specifications.

Installation Notes

Installation is performed by qualified mechanics or millwrights following applicable torque specifications for Grade 8 fasteners as defined by the joint design engineer or equipment manufacturer. Always de-energize and lock out equipment before fastener replacement or assembly work. Use the correct 1-1/2 inch hex wrench or impact socket to avoid rounding the drive head. Do not substitute a lower-grade fastener in any application specifying Grade 8 strength.