Value Collection 440564BR Hex Cap Screw 5/8-18 X 8 in Grade L9

Product Description

The VALUE COLLECTION 440564BR is a partially threaded hex head cap screw designed for high-strength fastening applications in mechanical, structural, and industrial assemblies. Manufactured from Grade L9 steel with a zinc yellow dichromate finish, this fastener delivers corrosion resistance alongside the elevated tensile strength characteristic of L9-rated hardware. The 5/8-18 thread size follows the Unified National Fine (UNF) standard, providing tighter thread engagement compared to coarse-thread equivalents. The 8-inch length under head accommodates deep grip ranges in bolted joint applications. Installation requires a 15/16-inch hex key or wrench. Machinists, millwrights, and maintenance technicians are the primary installers of this fastener type.

This cap screw is suited for applications where high clamp load and vibration resistance are required, particularly in heavy equipment, agricultural machinery, hydraulic systems, and power transmission assemblies. The UNF thread form makes it appropriate for use in tapped holes in steel or other ferrous materials where fine thread engagement is specified by design. Partially threaded shanks allow for a smooth bearing surface in clearance holes, which is standard practice in structural and precision bolt joint configurations.

Key Features

• Grade L9 steel construction for high tensile strength in demanding fastening applications
• 5/8-18 UNF thread form for tighter thread engagement and improved vibration resistance
• Partially threaded shank provides smooth bearing surface through clearance holes
• Zinc yellow dichromate finish offers corrosion protection in moderate-exposure environments
• 8-inch length under head accommodates deep grip ranges in bolted assemblies
• 15/16-inch hex drive compatible with standard wrenches and socket sets

Compatibility

Designed as an OEM-style replacement or direct-install fastener for applications specifying a 5/8-18 UNF partially threaded hex head cap screw in Grade L9 steel.

Installation Notes

Installation should be performed by qualified machinists, millwrights, or maintenance technicians familiar with bolted joint specifications. Verify thread engagement depth and hole clearance before installation. Apply appropriate thread lubricant or threadlocker as required by the joint specification. Follow ASME or applicable fastener standards for torque procedure; do not exceed the design clamp load for the mating material.