Value Collection R52001293 Hex Head Cap Screw 7/8-9 Unc

Product Description

The VALUE COLLECTION R52001293 is a partially threaded hex head cap screw designed for general mechanical fastening applications. It features a 7/8-9 UNC thread form and measures 10 inches in length under the head, making it well suited for through-bolting thick structural members, machinery frames, and fabricated assemblies. The fastener is manufactured from Grade 2 steel with a zinc-plated finish that provides a basic level of corrosion resistance in dry or mildly humid environments. The 1-5/16 inch hex drive size is compatible with standard commercial hex wrenches and impact sockets. Machinists, millwrights, pipefitters, and general maintenance technicians are the typical installers of this fastener.

This cap screw is appropriate for light-to-moderate structural and mechanical fastening tasks in residential and commercial settings. Partial threading allows the unthreaded shank to bear shear loads while the threaded section engages a nut or tapped hole. Typical applications include equipment mounting, structural steel connections, conveyor frames, and general fabrication work where a standard hex head and UNC thread form are specified.

Key Features

• 7/8-9 UNC thread form for compatibility with standard unified coarse-thread nuts and tapped holes
• 10-inch length under head accommodates thick material stacks and deep through-bolt installations
• Partially threaded shank improves shear load performance at the joint interface
• Grade 2 steel construction meets ASME B18.2.1 and SAE J429 dimensional and mechanical standards
• Zinc-plated finish provides basic corrosion resistance in dry and mildly humid environments
• 1-5/16 inch hex drive compatible with standard commercial sockets and open-end wrenches

Compatibility

Designed as a standard 7/8-9 UNC hex head cap screw conforming to ASME B18.2.1, this fastener is compatible with any application specifying a Grade 2 steel, partially threaded hex cap screw in that thread size and 10-inch length under head.

Installation Notes

Installation is performed by maintenance technicians, millwrights, or general contractors using a torque wrench or impact driver fitted with the appropriate hex socket. Always match the nut or tapped hole to the 7/8-9 UNC thread specification before installation. Apply a thread lubricant or anti-seize compound where specified by the equipment manufacturer to achieve accurate clamp load from torque. Follow applicable industry standards and equipment manufacturer guidelines for proper fastener torque values.