Value Collection R57001283 Hex Head Cap Screw 7/8-9

Product Description

The Value Collection R57001283 is a 7/8-9 hex head cap screw designed for heavy-duty fastening applications requiring corrosion resistance and dimensional reliability. Manufactured from 18-8 stainless steel with an uncoated finish, this fastener measures 3-1/4 inches under the head and features a partially threaded shank with a UNC thread standard. The 7/8-9 designation indicates a 7/8-inch nominal diameter with 9 threads per inch. At 0.4 pounds, this is a robust, single-piece fastener well suited to structural and mechanical assembly work across a range of industries and job sites.

This cap screw is appropriate for use in applications where standard carbon steel fasteners are not acceptable due to moisture, chemical exposure, or corrosion concerns. The partial threading allows for clamping force to be distributed across an unthreaded shank section, making it a practical choice for through-bolt configurations in flanged joints, equipment mounting, and structural connections. Trades commonly using this fastener include mechanical contractors, pipefitters, millwrights, and maintenance technicians working on commercial and industrial equipment.

Key Features

• 18-8 stainless steel construction for corrosion resistance in wet or chemical-exposed environments
• Partially threaded shank provides a smooth bearing surface for clamping applications
• UNC thread form for compatibility with standard inch-series nuts and tapped holes
• Uncoated finish — no surface treatment to interfere with dimensional tolerances or conductivity
• 3-1/4-inch length under head suits medium-depth through-bolt and flanged assembly configurations

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 UNC thread standards in the inch measurement system.

Installation Notes

Installation is typically performed by mechanical contractors, millwrights, or maintenance technicians using a standard hex wrench or socket set. Ensure mating threads are clean and free of debris before installation. Apply appropriate thread lubricant or anti-seize compound as required by the application to prevent galling, which is a common concern with stainless steel fasteners. Torque to the value specified by the equipment manufacturer or applicable structural standard for the joint being assembled.