Bowmalloy 36418 Hex Head Cap Screw 1/2-20 X 5 in Grade 9

Product Description

The BOWMALLOY 36418 is a Grade 9 alloy steel hex head cap screw sized 1/2-20 x 5 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 appropriate for high-stress structural and mechanical assemblies. The 1/2-20 thread designation indicates a fine-thread profile, which provides greater resistance to loosening under vibration compared to coarse-thread equivalents. The screw is partially threaded, leaving a smooth shank section near the head for bearing-load applications. Licensed tradespeople and maintenance technicians working on industrial equipment, heavy machinery, or structural frameworks will find this fastener suited to demanding bolted joint requirements.

This cap screw is used in mechanical, structural, and industrial assembly applications where a fine-thread, high-strength fastener is required. The partial threading makes it well suited for joints where the shank bears shear loads. Typical install scenarios include equipment mounting, frame assemblies, and machinery maintenance requiring a corrosion-resistant, high-strength hex fastener. The clear zinc chromate finish provides baseline corrosion protection suitable for dry or mildly exposed environments.

Key Features

• Grade 9 alloy steel construction for high tensile strength in demanding assemblies
• 1/2-20 fine-thread profile resists loosening under vibration
• 5-inch length under head accommodates thicker joint stacks
• Partially threaded shank supports shear-load bearing applications
• Zinc-plated clear chromate finish provides corrosion resistance in dry and mildly exposed conditions
• Inch measurement system with UNSPSC Code 31161501 for procurement classification

Compatibility

Designed as a standard inch-series hex head cap screw for use in any application requiring a 1/2-20 fine-thread, Grade 9 alloy steel fastener with a 5-inch length under head.

Installation Notes

Installation should be performed by qualified mechanical technicians or tradespeople familiar with fastener torque specifications for Grade 9 alloy steel hardware. Always verify that the mating threaded component or nut matches the 1/2-20 fine-thread specification before assembly. Use a properly sized hex socket or wrench to avoid rounding the hex head. Follow applicable industry standards and equipment manufacturer torque guidelines when securing structural or mechanical joints.