Bowmalloy 36159 Hex Head Cap Screw 5/8-11 X 5 in Grade 9

Product Description

The BOWMALLOY 36159 is a Grade 9 alloy steel hex head cap screw sized 5/8-11 x 5 inches with a clear zinc chromate finish. Grade 9 alloy steel delivers higher tensile strength than standard Grade 5 or Grade 8 fasteners, making this screw well suited for demanding structural and mechanical assemblies. The partially threaded shank provides a smooth bearing surface in the grip zone, which is important for accurate clamping load distribution. The clear zinc chromate plating adds a layer of corrosion resistance while maintaining dimensional tolerances. This fastener is installed by licensed millwrights, ironworkers, heavy equipment mechanics, and general contractors working on commercial or industrial applications.

This cap screw is commonly used in structural steel connections, heavy machinery frames, agricultural equipment, and industrial fabrication where high-strength fasteners are required. The 5/8-11 coarse thread is the standard Unified National Coarse designation for this diameter, compatible with matching 5/8-11 threaded nuts, inserts, and tapped holes in inch-series assemblies. Partial threading allows it to function as a shoulder-type fastener in through-bolt applications where thread engagement is needed only at the nut end.

Key Features

• Grade 9 alloy steel construction for superior tensile strength over Grade 5 and Grade 8
• 5/8-11 coarse thread, inch-series UNC standard
• 5-inch length under head for deep grip applications
• Partially threaded shank for accurate clamping load in through-bolt installations
• Clear zinc chromate finish for corrosion resistance

Compatibility

Designed for use with standard 5/8-11 UNC inch-series nuts, washers, and tapped holes in structural and mechanical assemblies requiring Grade 9 alloy steel fasteners.

Installation Notes

Installation should be performed by qualified tradespeople following applicable industry torque standards for Grade 9 fasteners at this diameter. Use appropriate wrenches or impact tools rated for the fastener size. Always inspect threads for damage before installation and ensure mating threads are clean and free of debris. Refer to the relevant structural or equipment specification for required clamp load and torque values.