Bowmalloy 36385 Hex Head Cap Screw 7/16-20 2.5 in Grade 9

Product Description

The BOWMALLOY 36385 is a partially threaded hex head cap screw manufactured from Grade 9 alloy steel with a zinc-plated clear chromate finish. It carries a 7/16-20 thread size and measures 2.5 inches under the head, making it a high-strength inch-series fastener suited for demanding mechanical and structural assemblies. Grade 9 alloy steel delivers greater tensile strength than standard Grade 5 or Grade 8 hardware, and the clear chromate coating provides corrosion resistance in typical shop and field conditions. Mechanics, millwrights, and maintenance technicians working on heavy equipment, HVAC structural assemblies, and industrial machinery reach for this fastener when joint integrity under load is the priority.

This screw is appropriate for use in bolted connections requiring high clamp load and vibration resistance. The partial threading allows the unthreaded shank to bear shear loads along the joint interface, a common requirement in equipment mounting, bracket installation, and structural bracketing found across HVAC, industrial, and trade-service applications. The 7/16-20 fine-thread pitch provides tighter thread engagement and improved resistance to loosening compared to coarse-thread equivalents.

Key Features

• Grade 9 alloy steel construction for high tensile strength beyond standard Grade 8 hardware
• Partially threaded shank handles shear loads at the joint interface
• 7/16-20 fine-thread pitch for improved clamp retention and vibration resistance
• Zinc-plated clear chromate finish for corrosion protection in typical service environments
• Inch measurement system, compatible with standard SAE tooling

Compatibility

Designed as a standard inch-series hex head cap screw for use in any bolted assembly specifying a 7/16-20 thread, 2.5-inch length under head, Grade 9 alloy steel, and partial threading.

Installation Notes

Installation should be performed by qualified mechanics or technicians familiar with fastener torque requirements for Grade 9 hardware. Always consult the equipment manufacturer's torque specification chart for the applicable joint design before tightening. De-energize and lock out any equipment before fastener service work begins. Use calibrated torque tooling appropriate for fine-thread alloy fasteners to avoid cross-threading or over-torque conditions.