Value Collection R63000888 Set Screw 1/4-20 X 3/8 in Cup Point

Product Description

The VALUE COLLECTION R63000888 is a 1/4-20 UNC set screw with a cup point tip and square drive, manufactured from grade 18-8 stainless steel. At 3/8 inches in length (measured under head), this fully threaded fastener is designed to lock shafts, collars, pulleys, and similar components in place without a protruding head. The cup point bites into the mating surface to resist rotational and axial movement. Grade 18-8 stainless steel provides solid corrosion resistance for applications where mild chemical or moisture exposure is a concern. Machinists, millwrights, and maintenance technicians working in light industrial and HVAC equipment assembly commonly specify this fastener type.

This set screw is suited for shaft-to-hub connections in motors, blower wheels, pulleys, and collar assemblies found in HVAC, plumbing, and general mechanical systems. The 1/4-20 UNC thread is one of the most widely used coarse-thread sizes in North American trade work, making this screw compatible with a broad range of tapped holes in standard collar and hub hardware. The square drive requires a matching square key for installation, which provides high torque transfer and reduces cam-out risk compared to hex socket drives.

Key Features

• Cup point geometry bites into shaft surface for positive hold against rotation and axial shift
• Grade 18-8 stainless steel construction for corrosion resistance in damp or mildly corrosive environments
• 1/4-20 UNC coarse thread for broad compatibility with standard tapped collars and hubs
• Square drive for high torque transfer with minimal cam-out
• 3/8 inch length provides adequate thread engagement in standard collar wall thicknesses
• Headless design sits flush with or below the surface for clearance-sensitive assemblies

Compatibility

Designed as a standard 1/4-20 UNC cup point set screw for use in any tapped collar, hub, or fixture that accepts this thread size and drive type.

Installation Notes

Installation requires a correctly sized square key driver. De-energize and lock out any equipment before servicing shaft assemblies. Ensure the mating bore is clean and the set screw is threaded in straight to avoid cross-threading. Apply a thread-locking compound if vibration is expected, following the compound manufacturer's guidance for stainless fasteners.