Bowmalloy 36459 Hex Head Cap Screw 5/8-18 X 5 in Grade 9

Product Description

The BOWMALLOY 36459 is a Grade 9 alloy steel hex head cap screw designed for high-strength fastening applications in demanding mechanical and structural assemblies. It features a 5/8-18 UNF thread size and a 5-inch length under the head with partial threading. The zinc-plated clear chromate finish provides corrosion resistance in standard service environments. Licensed mechanics, millwrights, and industrial maintenance technicians typically select Grade 9 fasteners where tensile strength requirements exceed what Grade 5 or Grade 8 hardware can deliver.

This cap screw is suited for heavy equipment, industrial machinery, and structural connections that require fine-thread engagement and high clamp load. The 5/8-18 UNF thread pitch offers finer thread engagement than its coarse-thread counterpart, making it appropriate for applications where vibration resistance and precise torque control are priorities. Partial threading allows for greater shank grip length in through-bolt configurations.

Key Features

• Grade 9 alloy steel construction for high tensile and proof load strength
• 5/8-18 UNF fine-thread pattern for improved vibration resistance and torque control
• 5-inch length under head with partial threading for extended grip length
• Zinc-plated clear chromate finish for corrosion protection in standard environments
• Hex head drive for standard socket and wrench installation

Compatibility

Designed as a high-strength replacement or OEM-style fastener for applications requiring 5/8-18 UNF Grade 9 hex head cap screws in inch-measurement assemblies.

Installation Notes

Installation should be performed by a qualified mechanic or millwright familiar with high-strength fastener torque requirements. Always clean and inspect mating threads before assembly. Use a calibrated torque wrench to achieve the specified clamp load for Grade 9 hardware per the applicable engineering standard. Do not substitute a lower-grade fastener in applications where Grade 9 is specified.