Bowmalloy 36117 Hex Head Cap Screw 1/2-13 X 4-1/2 in Grade 9

Product Description

The BOWMALLOY 36117 is a Grade 9 alloy steel hex head cap screw sized at 1/2-13 thread and 4-1/2 inches in length under head. Grade 9 alloy steel delivers higher tensile strength than Grade 5 or Grade 8 fasteners, making it a fit for demanding structural and mechanical assemblies where fastener integrity under heavy load or vibration is critical. The clear zinc chromate finish provides corrosion resistance suitable for general industrial and trade applications. This screw is partially threaded, which allows for a smooth shank section to bear shear loads while the threaded portion engages the mating component. Supplied in packages of 25 per the manufacturer standard pack quantity.

This hex head cap screw is used across a wide range of commercial and industrial applications including HVAC equipment mounting, mechanical equipment frames, structural steel connections, and general trade assembly work. The 1/2-13 coarse thread pattern is one of the most common inch-series sizes in the field, compatible with standard hex nuts, lock nuts, and threaded plate stock of matching pitch. Licensed tradespeople in HVAC, plumbing, and general mechanical contracting will encounter this size routinely in equipment installation and structural bracketing work.

Key Features

• Grade 9 alloy steel construction for high tensile strength in heavy-duty applications
• 1/2-13 coarse thread, one of the most widely used inch-series fastener sizes in trade work
• 4-1/2 inch length under head accommodates thick stack-ups and structural connections
• Partial threading preserves a smooth shank section for shear-bearing installations
• Clear zinc chromate finish provides corrosion resistance for general service environments
• Packed in quantities of 25 for job-site and shop use

Compatibility

Designed for use with standard 1/2-13 inch-series hex nuts, coupling nuts, and threaded components conforming to ASME B18.2.1 hex cap screw standards for inch fasteners.

Installation Notes

Installation should follow applicable mechanical or structural fastening codes for the specific assembly type. Use an appropriate torque wrench and refer to the assembly specification or fastener manufacturer torque tables for Grade 9 hardware at this diameter and thread pitch. Ensure mating threads are clean and free of debris before assembly. Do not mix Grade 9 fasteners with lower-grade nuts or threaded inserts not rated for the corresponding load.