Bowmalloy 36121 Hex Head Cap Screw 1/2-13 X 6-1/2 in Grade 9

Product Description

The BOWMALLOY 36121 is a partially threaded hex head cap screw engineered for high-strength fastening applications in industrial, mechanical, and trade construction work. Built from Grade 9 alloy steel, this screw delivers superior tensile strength compared to standard Grade 5 or Grade 8 fasteners, making it appropriate for demanding structural and equipment-mounting situations. The clear zinc chromate finish provides a baseline level of corrosion resistance while maintaining dimensional precision. At 1/2-13 thread size and 6-1/2 inches in length under the head, it covers longer-reach fastening needs where standard-length hardware falls short. Mechanical contractors, millwrights, and field service technicians working with heavy equipment or structural assemblies are the primary installers of this fastener.

This cap screw is suited for use in industrial equipment assembly, structural steel connections, machinery mounting, and heavy mechanical installations where a Grade 9 alloy steel fastener is specified. The partial threading allows the unthreaded shank to act as a shoulder or grip length, which is useful in shear-load applications and pivot-point connections. It follows the inch measurement system with a 1/2-13 UNC thread profile, standard for North American trade and industrial applications. Contractors and maintenance technicians working across HVAC equipment bases, pump skids, and mechanical room installations will find this length and grade combination practical for through-bolt and tapped-hole applications.

Key Features

• Grade 9 alloy steel construction delivers high tensile and proof load strength beyond standard Grade 8 ratings
• Partially threaded shank supports shear-load and shoulder-fit fastening scenarios
• Clear zinc chromate finish provides corrosion resistance in dry to mildly humid environments
• 1/2-13 UNC thread size is compatible with standard inch-system nuts, tapped holes, and thread inserts
• 6-1/2 inch length under head accommodates longer grip lengths and through-bolt applications

Compatibility

Designed for use in any application requiring a 1/2-13 UNC partially threaded hex head cap screw in Grade 9 alloy steel with a clear zinc chromate finish, following the inch measurement system.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or licensed contractor familiar with fastener grade specifications and torque requirements for the application. Always consult the equipment manufacturer's service documentation for proper installation torque values before tightening. Use appropriate hand or power tools rated for 1/2-inch drive fasteners, and verify thread engagement depth meets the requirements of the joint design. Do not mix fastener grades within a critical bolted joint, as this can result in uneven load distribution and fastener failure.