Value Collection 403318BR Hex Head Cap Screw 7/8-9

Product Description

The VALUE COLLECTION 403318BR is a partially threaded hex head cap screw designed for general-purpose fastening in mechanical, structural, and industrial assemblies. It features a 7/8-9 UNC thread size and measures 3-1/2 inches under the head, making it suitable for medium-to-heavy fastening applications where a partially threaded shank is required for grip and shear strength. Constructed from Grade 2 steel with a zinc-plated finish, this fastener provides baseline corrosion resistance in dry and mildly humid environments. It is driven with a 1-5/16 inch hex key or standard hex wrench. Machinists, millwrights, maintenance technicians, and general contractors are the typical installers.

This cap screw is used in a wide range of residential and commercial construction, equipment assembly, and maintenance-repair-operations (MRO) applications. The partial threading allows the unthreaded shank to bear lateral loads while the threaded portion engages the nut or tapped hole securely. It is appropriate for wood-to-metal connections, machinery frames, structural steel connections, and similar assemblies where a Grade 2 steel fastener meets the load requirements.

Key Features

• 7/8-9 UNC thread form for compatibility with standard inch-series nuts and tapped holes
• 3-1/2 inch length under head provides ample grip for thick material stacks
• Partially threaded shank improves shear strength and maintains alignment under lateral loads
• Grade 2 steel construction meets general-purpose structural fastening requirements
• Zinc-plated finish offers baseline corrosion resistance in dry or mildly humid conditions
• 1-5/16 inch hex drive fits standard open-end, box-end, and socket wrenches

Compatibility

Designed as a standard inch-series UNC hex head cap screw compatible with 7/8-9 nuts, threaded inserts, and tapped holes conforming to ASME B18.2.1 dimensional standards.

Installation Notes

Installation is performed with a 1-5/16 inch hex wrench, socket, or impact driver with the appropriate socket. Ensure mating threads are clean and free of debris before assembly. Do not exceed the rated load for Grade 2 steel in high-tension or fatigue-critical applications where a higher-grade fastener may be required. Follow applicable structural or mechanical codes for torque and joint requirements.