Bowmalloy 36153 Hex Head Cap Screw 5/8-11 X 3 in Grade 9

Product Description

The BOWMALLOY 36153 is a Grade 9 alloy steel hex head cap screw in a 5/8-11 thread size with a 3-inch length under head. Grade 9 fasteners exceed the mechanical requirements of Grade 8, making this screw well-suited for high-strength bolting applications where elevated tensile and proof load values are required. The clear zinc chromate finish provides corrosion resistance while maintaining a bright appearance. This is a partially threaded fastener, which allows for shank engagement in structural and mechanical assemblies. It is installed by licensed millwrights, ironworkers, pipefitters, and maintenance mechanics across industrial and commercial jobsites.

This hex head cap screw is used in heavy equipment assembly, structural steel connections, machinery mounting, and other high-load bolting applications that require an inch-series fastener with a 5/8-11 UNC thread profile. The partially threaded design provides a bearing shank section that resists lateral shear loads, making it appropriate for joints where precise bolt positioning and load transfer are critical. Sold in packages of 25.

Key Features

• Grade 9 alloy steel construction for high tensile strength exceeding Grade 8 requirements
• 5/8-11 UNC thread size, inch-series measurement system
• 3-inch length under head for deep engagement in structural applications
• Partially threaded shank provides shear resistance at the joint interface
• Clear zinc chromate finish for corrosion protection in general industrial environments
• Packaged in quantities of 25, minimum order quantity of 1 package

Compatibility

Designed as an OEM-style replacement or direct fitment hex head cap screw for any application requiring a 5/8-11 UNC thread, 3-inch length under head, Grade 9 alloy steel partially threaded fastener in an inch-series bolted connection.

Installation Notes

Installation should be performed by qualified tradespeople following applicable ASME, AISC, or machinery manufacturer torque specifications for Grade 9 fasteners. Verify that the mating nut or tapped hole thread class matches the 5/8-11 UNC profile before installation. Always de-energize and lock out equipment before replacing fasteners on live machinery. Do not substitute Grade 9 hardware with lower-grade fasteners in high-strength joint designs.