Value Collection 440728BR Hex Head Cap Screw 1-8 X 4 in Grade L9

Product Description

The VALUE COLLECTION 440728BR is a partially threaded hex head cap screw designed for high-strength bolted connections in demanding mechanical and structural applications. Manufactured from Grade L9 steel, this fastener delivers superior tensile strength compared to standard Grade 5 or Grade 8 hardware. It features a zinc yellow dichromate finish that provides corrosion resistance while meeting common industrial specifications. The 1-8 UNC thread pattern and 4-inch length under head make it suitable for heavy-duty assemblies where controlled clamp load and thread engagement depth are critical. Machinists, millwrights, and maintenance technicians are the primary installers.

This cap screw is suited for use in industrial machinery, heavy equipment, structural steel assemblies, and OEM fabrication applications requiring high-strength inch-series fasteners. The UNC thread form is the standard for general-purpose inch fasteners in North American manufacturing and maintenance environments. The partial threading leaves a smooth shank section under the head, which is important for applications where shear loading or precise hole alignment is a factor. It is sold individually.

Key Features

• Grade L9 steel construction for high tensile and proof load strength
• Zinc yellow dichromate finish provides corrosion resistance and visual identification
• Partially threaded shank supports shear load applications and precise hole fit
• 1-8 UNC thread standard for broad compatibility with inch-series nuts and tapped holes
• 1-1/2 inch hex key size for standard hex wrench or socket drive installation
• 4-inch length under head suits deep stack or thick-flange assemblies

Compatibility

Designed as a standard inch-series UNC hex head cap screw for use with any 1-8 UNC threaded nut or tapped hole requiring a Grade L9 high-strength fastener.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or maintenance technician familiar with high-strength fastener torque requirements. Always consult the applicable equipment service manual or engineering specification for the correct torque value before installation, as Grade L9 fasteners have specific preload requirements that differ from standard Grade 5 and Grade 8 hardware. Ensure mating threads are clean, undamaged, and properly lubricated or dry as specified before assembly. Do not use impact tools for final torquing unless the procedure specifically calls for it.