Value Collection 39211 Hex Head Cap Screw 7/8-9 X 9 in Grade 8

Product Description

The VALUE COLLECTION 39211 is a partially threaded hex head cap screw in the 7/8-9 UNC thread size with a 9-inch length under head. Manufactured from Grade 8 steel and finished with a zinc yellow dichromate coating, this fastener delivers high tensile strength and corrosion resistance suited to heavy-duty mechanical and structural applications. It conforms to ASME B18.2.1 dimensional standards, ensuring consistent fit across standard tooling and assembly hardware. Sold in a package of 2, this screw is a practical choice for maintenance, fabrication, and repair operations requiring large-diameter, high-strength fasteners.

This cap screw is used in industrial machinery assembly, structural steel fabrication, heavy equipment maintenance, and general mechanical applications where high-strength inch-series fasteners are required. The partial thread design allows for precise clamping without thread engagement across the full grip length, making it well suited for through-bolt and joint applications where a smooth shank section is preferred. It is appropriate for both shop and field installation by millwrights, ironworkers, mechanics, and maintenance technicians.

Key Features

• Grade 8 steel construction provides high tensile and proof load strength for demanding applications
• Zinc yellow dichromate finish offers corrosion resistance and surface protection
• Partial threading allows smooth shank engagement for proper joint clamping
• 7/8-9 UNC thread ensures compatibility with standard inch-series nuts and tapped holes
• Conforms to ASME B18.2.1 for dimensional accuracy and interchangeability
• Package quantity of 2 supports small-quantity maintenance and repair needs

Compatibility

Designed for use with standard 7/8-9 UNC inch-series hex nuts, flat washers, and tapped holes conforming to ASME B18.2.1 dimensional requirements.

Installation Notes

Installation is performed by qualified mechanics, millwrights, or maintenance technicians using standard hex wrenches or impact tooling sized for a 7/8-9 fastener. Always verify that the mating nut or tapped hole thread class is compatible before installation. Follow applicable torque specifications from the equipment manufacturer or relevant structural standards. De-energize or isolate any equipment before fastener replacement on live machinery.