Bowmalloy BOW36457 Hex Head Cap Screw 5/8-18 X 4 in Grade 9

Product Description

The BOWMALLOY BOW36457 is a Grade 9 steel hex head cap screw designed for high-strength fastening applications. It measures 5/8-18 thread size with a 4-inch length under the head and features partial threading along the shank. The Bowma-Guard finish provides a zinc-plated clear chromate coating that resists corrosion in demanding service environments. This fastener is sized for use in inch-system assemblies and is suited for installation by maintenance technicians, millwrights, and trade professionals who require a reliable, high-tensile hex cap screw.

This screw is commonly used in heavy-duty mechanical and structural assemblies where Grade 9 tensile strength is required. Typical applications include equipment mounting, machinery frames, and structural connections in industrial, HVAC, and utility settings. The partial threading is suited for applications that require a smooth shank section for shear loading or precise alignment between mating parts.

Key Features

• Grade 9 steel construction delivers high tensile and proof load strength
• 5/8-18 UNF thread provides fine-pitch engagement for vibration-resistant fastening
• 4-inch length under head accommodates thick assemblies and stacked components
• Partial threading preserves a smooth shank section for shear and alignment applications
• Bowma-Guard zinc-plated clear chromate finish resists corrosion in exposed environments
• Inch-system dimensions for direct compatibility with standard SAE tooling and hardware

Compatibility

Designed as a high-strength inch-system hex head cap screw for use in assemblies requiring a 5/8-18 UNF thread and 4-inch grip length. Verify thread class, hole clearance, and mating nut grade before installation.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or trade professional familiar with fastener torque requirements for Grade 9 hardware. De-energize and lock out all equipment before beginning fastener replacement or assembly work. Use a properly sized hex socket or wrench to avoid rounding the head. Consult applicable industry standards for torque values based on thread size, grade, and lubrication condition.