Value Collection D39202 Hex Head Cap Screw 7/8-9 X 4.5 in Grade 8

Product Description

The VALUE COLLECTION D39202 is a partially threaded hex head cap screw designed for high-strength fastening applications in industrial, mechanical, and construction assemblies. Manufactured from Grade 8 steel with a zinc yellow dichromate finish, this fastener delivers elevated tensile and proof load strength compared to lower-grade alternatives. The 7/8-9 UNC thread size and 4-1/2 inch length under head make it well suited for heavy-duty bolted joints where reliable clamping force is required. The zinc yellow dichromate coating provides corrosion resistance while serving as a visual identifier of Grade 8 classification.

This cap screw is used in structural, equipment mounting, and machinery assembly applications where ASME B18.2.1 and SAE J429 Grade 8 compliance is specified. The partial threading allows for a smooth shank section that bears shear loads more effectively than a fully threaded fastener, making it appropriate for applications with close-tolerance bores or joints subject to lateral forces. Machinists, millwrights, and maintenance technicians commonly install this type of fastener in equipment frames, flanges, and heavy mechanical assemblies.

Key Features

• Grade 8 steel construction meets SAE J429 high-strength fastener requirements
• Partially threaded shank improves shear load performance in bolted joints
• Zinc yellow dichromate finish provides corrosion resistance and serves as a Grade 8 visual indicator
• 7/8-9 UNC thread form for broad compatibility with standard inch-series nuts and tapped holes
• Conforms to ASME B18.2.1 dimensional standards for hex head cap screws

Compatibility

Designed as a standard inch-series hex head cap screw for use with 7/8-9 UNC nuts, washers, and tapped holes in applications requiring ASME B18.2.1 and SAE J429 Grade 8 compliant fasteners.

Installation Notes

Install with an appropriate hex socket or open-end wrench sized for the 7/8-9 fastener. Use a calibrated torque wrench when a specific clamp load is required by the assembly specification. Always use a hardened flat washer under the head when bearing on softer materials. Inspect threads and mating tapped holes for damage before installation to ensure proper thread engagement.