Value Collection R63266882 Set Screw 5/16-18 X 1 in

Product Description

The VALUE COLLECTION R63266882 is a cup point set screw used to secure rotating components such as collars, pulleys, and hubs to shafts without a protruding head. This fastener features a 5/16-18 UNC thread form and measures 1 inch in overall length. It is driven by a 3/32-inch hex key and seats with a cup point that bites into the shaft surface to resist axial and rotational movement. Constructed from Grade 18-8 stainless steel, it offers corrosion resistance suitable for wet, chemical, or outdoor environments. Machinists, maintenance mechanics, and millwrights install this type of screw across a broad range of mechanical assemblies.

This set screw is suited for light-to-medium-duty shaft retention in industrial, commercial, and maintenance applications. Typical installations include motor couplings, conveyor components, pump assemblies, and general mechanical fixtures where a flush or below-surface fastener is required. The cup point geometry creates a circular indentation on the shaft, providing a positive mechanical lock under vibration. Its stainless steel construction makes it a common choice in food processing, marine, and HVAC environments where carbon steel hardware would be prone to rust or contamination.

Key Features

• Cup point tip bites into shaft surface for positive rotational and axial retention
• Grade 18-8 stainless steel construction for corrosion resistance in harsh or wet environments
• 5/16-18 UNC thread standard for broad tooling and hardware compatibility
• 1-inch overall length for adequate thread engagement in standard shaft collars and hubs
• 3/32-inch hex drive for use with standard Allen keys and hex drivers
• Headless design installs flush or below the surface of the workpiece

Compatibility

Designed as a standard 5/16-18 UNC cup point set screw for use in any mechanical assembly requiring a 5/16-18 threaded socket with a 3/32-inch hex drive and 1-inch length fastener.

Installation Notes

Installation is performed by maintenance mechanics or machinists using a 3/32-inch hex key or Allen driver. Secure and de-energize all rotating equipment before removing or installing shaft hardware. Clean the shaft seating area before installation to ensure proper cup point contact. Do not overtighten, as stainless steel fasteners can gall in threaded bores; consider an anti-seize compound on the threads where appropriate.