Bowmalloy BOW36034 Hex Cap Screw 5/16-18 X 2-1/4 in Grade 9

Product Description

The BOWMALLOY BOW36034 is a Grade 9 steel hex head cap screw with a 5/16-18 thread size and a 2-1/4 inch length under the head. It features partial threading and a Bowma-Guard zinc-plated clear chromate finish for corrosion resistance. This fastener is manufactured to inch-system standards and is intended for high-strength bolted connections in mechanical, structural, and equipment assembly applications. Installation requires a standard hex wrench or socket. Grade 9 steel offers higher tensile strength than the more common Grade 5 or Grade 8 designations, making it suitable for demanding fastening tasks across trade and industrial environments.

This cap screw is suited for use in equipment assembly, structural bracketing, and mechanical installations where a high-strength inch-series fastener is required. The partial threading allows the unthreaded shank to bear shear loads, which is typical in applications involving close-tolerance clearance holes or pivot-style joints. It is used by mechanical contractors, millwrights, equipment installers, and maintenance technicians across HVAC, plumbing, and general industrial service work.

Key Features

• Grade 9 steel construction provides elevated tensile strength beyond standard Grade 5 and Grade 8 fasteners
• 5/16-18 UNC thread size conforms to inch-system fastener standards
• 2-1/4 inch length under head suits medium-depth through-bolt and tapped-hole applications
• Partial threading allows the shank to carry shear loads in close-tolerance installations
• Bowma-Guard zinc-plated clear chromate finish provides baseline corrosion protection
• Hex head drive style compatible with standard hex wrenches and impact sockets

Compatibility

Designed as a standard inch-series hex head cap screw for use in any application requiring a 5/16-18 threaded fastener with a 2-1/4 inch grip length and partial threading.

Installation Notes

Installation should be performed by a qualified mechanic or tradesperson following applicable torque specifications for Grade 9 fasteners as defined by the relevant equipment or structural specification. Ensure the mating hole is clean, free of debris, and sized to the correct clearance or tap drill diameter before installing. Do not reuse fasteners that show signs of thread damage, corrosion, or deformation. Follow applicable mechanical or structural codes for the specific installation environment.