Bowmalloy 36429 Hex Head Cap Screw 9/16-18 X 1 in Grade 9

Product Description

The BOWMALLOY 36429 is a Grade 9 alloy steel hex head cap screw designed for high-strength fastening applications across industrial, mechanical, and trade construction environments. The fastener measures 9/16-18 thread size with a 1-inch length under the head and is fully threaded from tip to head. A zinc-plated clear chromate finish provides corrosion resistance in both indoor and moderate outdoor exposure conditions. Licensed professionals and skilled tradespeople install this screw where SAE-grade tensile requirements demand a step above standard Grade 5 or Grade 8 hardware.

This hex head cap screw is suited for heavy equipment assembly, structural mechanical connections, and industrial maintenance applications where Grade 9 minimum proof load and tensile strength are specified. The 9/16-18 fine thread pitch delivers higher thread engagement strength and better resistance to loosening under vibration compared to coarse-thread equivalents. Fully threaded construction ensures consistent clamping across the entire grip length, making it appropriate for shorter-stack fastening scenarios common in machinery and fabrication work.

Key Features

• Grade 9 alloy steel construction exceeds Grade 8 tensile strength requirements
• 9/16-18 UNF fine thread for superior vibration resistance and thread engagement
• Fully threaded body maximizes clamping over the complete 1-inch length under head
• Zinc-plated clear chromate finish provides corrosion protection for general-duty environments
• Inch system of measurement - compatible with standard SAE tooling and hex sockets

Compatibility

Designed as a high-strength OEM-style replacement or new-installation fastener for applications specifying 9/16-18 UNF Grade 9 alloy steel hex cap screws in inch-measurement fastening systems.

Installation Notes

Installation should be performed by a qualified mechanic or tradesperson following the applicable equipment manufacturer torque specifications for Grade 9 hardware. Always inspect mating threads for damage before installation and ensure the receiving bore is free of debris. Use a properly sized hex socket or wrench to avoid fastener head rounding. Do not substitute Grade 9 fasteners with lower-grade hardware in applications where Grade 9 is specified.