Bowmalloy 36414 Hex Head Cap Screw 1/2-20 X 3.5in Grade 9

Product Description

The BOWMALLOY 36414 is a Grade 9 alloy steel hex head cap screw sized 1/2-20 x 3-1/2 inches with a zinc-plated clear chromate finish. Grade 9 alloy steel delivers higher tensile strength than standard Grade 5 or Grade 8 fasteners, making this screw well suited for high-stress mechanical and structural connections. The partial threading design provides a smooth shank section under the head, which improves clamping force and shear resistance in bolted joints. This fastener is installed by mechanics, millwrights, and field technicians working on heavy equipment, industrial machinery, and structural assemblies where fastener strength and corrosion resistance are both required.

This cap screw is used in applications that demand a high-strength inch-series fastener with fine-thread engagement. Fine threads in the 1/2-20 configuration provide greater thread engagement per inch compared to coarse-thread alternatives, which is advantageous in thin-material joints or where precise torque control is critical. Typical install scenarios include heavy equipment repair, agricultural machinery, and industrial fabrication where Grade 9 tensile ratings are specified by the OEM or design engineer.

Key Features

• Grade 9 alloy steel construction for high tensile strength in demanding fastener applications
• 1/2-20 fine thread series for precise torque control and stronger thread engagement
• 3-1/2 inch length under head accommodates deep bolted joint stacks
• Partial threading preserves smooth shank for improved clamping and shear load performance
• Zinc-plated clear chromate finish provides corrosion resistance in typical service environments
• Inch measurement system for compatibility with standard SAE tooling and hardware

Compatibility

Designed as a standard inch-series hex head cap screw for use in any application calling for a 1/2-20 x 3-1/2 inch Grade 9 alloy steel fastener with partial threading.

Installation Notes

Installation is performed with a standard hex wrench or socket set sized for a 1/2-20 fastener. Always verify mating thread condition and class fit before installation to avoid galling or cross-threading. Follow the applicable torque specification from the equipment OEM or engineering drawing for Grade 9 fasteners of this size. Inspect the zinc-plated finish for damage before use, as compromised coating can reduce corrosion resistance in wet or outdoor service environments.