Bowmalloy BOW36198 Hex Head Cap Screw 7/8-9x3 Grade 9

Product Description

The BOWMALLOY BOW36198 is a Grade 9 steel hex head cap screw with a 7/8-9 thread size and a 3-inch length under the head. It is partially threaded and finished with a clear zinc chromate coating for corrosion resistance. This fastener is used in heavy-duty mechanical and structural assemblies where high-strength bolting is required. Millwrights, industrial maintenance technicians, and mechanical contractors typically specify Grade 9 fasteners for demanding load and torque applications where lower-grade hardware is not acceptable.

This screw is suited for industrial and commercial mechanical assemblies, heavy equipment maintenance, structural steel connections, and similar high-load bolted joints. The partial threading design is appropriate for applications requiring a smooth shank section to bear shear loads or provide a precise clamping length. Packaged in quantities of 10 per package, this fastener is practical for both single-use repairs and multi-fastener jobs.

Key Features

• Grade 9 steel construction for high tensile strength in demanding applications
• 7/8-9 UNC thread size for compatibility with standard inch-series nuts and tapped holes
• 3-inch length under head accommodates thicker joint stacks and structural members
• Partial threading provides a smooth shank for shear-bearing and precise clamping
• Clear zinc chromate finish provides baseline corrosion protection in moderate environments
• Sold in 10-piece packages for efficient job-site use

Compatibility

Designed for use with standard 7/8-9 UNC inch-series hex nuts, flat washers, and lock washers in heavy-duty bolted joint assemblies.

Installation Notes

Installation should be performed by a qualified millwright, mechanic, or maintenance technician following applicable torque specifications for Grade 9 fasteners and the equipment manufacturer's service documentation. Always use a calibrated torque wrench and the correct 7/8-inch hex socket when tightening. Inspect mating threads in nuts or tapped holes for damage or contamination before assembly. Do not use impact tools without verifying that final torque is confirmed with a calibrated torque wrench.