Value Collection 12664CH8O Hex Head Cap Screw Grade 8

Product Description

The VALUE COLLECTION 12664CH8O is a Grade 8 steel hex head cap screw designed for high-strength fastening applications across industrial, mechanical, and structural assemblies. Measuring 1-1/4-12 UNF thread by 4 inches in length under head, this fastener is partially threaded and finished with a zinc yellow dichromate coating that provides corrosion resistance. With a tensile strength of 150,000 psi and conformance to ASME B18.2.1 and SAE J429 standards, this screw is suited for demanding load-bearing connections where fastener integrity is critical. It weighs 1.93 pounds and requires a 1-7/8 inch hex key or wrench for installation.

This hex head cap screw is used in heavy equipment assembly, industrial machinery, structural steel connections, and maintenance and repair operations requiring high-strength Grade 8 hardware. The partially threaded shank provides a bearing surface for precise clamping in bolted joint applications. It is commonly installed by millwrights, maintenance technicians, and mechanical contractors working on equipment where torque and clamping load specifications are critical. The 1-1/4-12 UNF thread pitch is a fine-thread designation, making it appropriate for applications where vibration resistance and fine adjustment are priorities.

Key Features

• Grade 8 steel construction with 150,000 psi tensile strength for high-load fastening
• Zinc yellow dichromate finish provides corrosion resistance in exposed or moderately harsh environments
• Partially threaded shank allows for accurate joint clamping without thread engagement through the full grip length
• Conforms to ASME B18.2.1 and SAE J429 standards for dimensional and mechanical consistency
• UNF 1-1/4-12 fine-thread profile for improved vibration resistance and precise torque control
• 1-7/8 inch hex drive for use with standard hex wrenches or impact tooling

Compatibility

Designed as a standard ASME B18.2.1 Grade 8 hex head cap screw compatible with 1-1/4-12 UNF threaded holes and nuts in inch-measurement fastener assemblies.

Installation Notes

Installation should be performed by qualified mechanical or maintenance technicians following the torque specifications provided by the equipment or structure manufacturer. De-energize and lock out equipment before fastener installation or removal in machinery applications. Use a properly sized 1-7/8 inch hex wrench or socket to avoid rounding the drive head. Follow applicable industry standards and engineering specifications for joint design and preload requirements.