Bowmalloy 36387 Hex Head Cap Screw 7/16-20 X 3 in Grade 9

Product Description

The BOWMALLOY 36387 is a Grade 9 alloy steel hex head cap screw sized 7/16-20 x 3 inches with a zinc-plated clear chromate finish. Grade 9 alloy steel delivers higher tensile strength than Grade 5 or Grade 8 fasteners, making this screw well suited for high-stress mechanical and structural connections. The partial threading leaves a smooth shank section under the head, which provides better shear resistance in bolted joints. The clear chromate zinc plating offers baseline corrosion protection in dry or mildly exposed environments. Installers working in HVAC equipment assemblies, electrical enclosures, or general mechanical fabrication will find this a reliable choice where a fine-thread, high-strength hex cap screw is required.

This fastener is used in applications that demand fine-thread engagement, typically in harder base materials or where greater vibration resistance is needed compared to coarse-thread fasteners. The 7/16-20 fine thread series is common in mechanical equipment frames, mounting brackets, compressor assemblies, and structural steel fabrication. Trades including HVAC technicians, pipefitters, millwrights, and general mechanical contractors routinely use Grade 9 hex cap screws in field assembly and equipment installation work.

Key Features

• Grade 9 alloy steel construction for high tensile strength in demanding mechanical connections
• 7/16-20 fine thread for stronger thread engagement and improved vibration resistance
• 3-inch length under head with partial threading for added shear resistance at the shank
• Zinc-plated clear chromate finish provides baseline corrosion protection
• Inch measurement system with UNSPSC code 31161501 for procurement and inventory tracking

Compatibility

Designed as a standard 7/16-20 Grade 9 alloy steel hex head cap screw suitable for general mechanical, structural, and equipment assembly applications requiring a fine-thread, high-strength fastener in the inch measurement system.

Installation Notes

Installation should be performed by a qualified mechanic, technician, or tradesperson familiar with proper fastener torque procedures for Grade 9 fine-thread hardware. Always consult the equipment manufacturer's torque specifications for the specific joint being assembled. De-energize and lock out any equipment before fastener replacement or installation. Avoid mixing Grade 9 fasteners with lower-grade nuts or hardware, as mismatched grades can reduce joint integrity.