Value Collection R63266326 Set Screw 1/4-28 X 1/2 in Cup Point Ss

Product Description

The VALUE COLLECTION R63266326 is a 1/4-28 UNF cup point set screw manufactured from Grade 18-8 stainless steel. Set screws are fully threaded fasteners with no head — they seat flush or below the surface of a component and apply clamping or positioning force through the point type. The cup point bites into a shaft or mating surface to resist rotation and axial movement. At 1/2 inch overall length with a 1/8 inch hex drive, this screw is sized for precision assemblies where low-profile retention is required. Installers in mechanical, HVAC, and industrial applications rely on this fastener class for shaft collars, pulleys, sprockets, and adjustment mechanisms.

This set screw is used in light-to-medium duty assemblies across residential and commercial mechanical systems. Common applications include motor shaft collars, fan hubs, knobs, and fixtures where the fastener must not protrude beyond the workpiece surface. The 1/4-28 UNF thread provides finer pitch than the coarse UNC equivalent, offering greater holding force per thread engagement and better resistance to vibration loosening — a consideration in HVAC blower and fan assemblies. The 18-8 stainless steel construction provides corrosion resistance suitable for wet, humid, or mildly chemical environments.

Key Features

• Cup point geometry bites into shaft surface for positive rotational and axial retention
• 1/4-28 UNF fine thread for improved vibration resistance and holding torque
• Grade 18-8 stainless steel construction for corrosion resistance in humid or wet service environments
• 1/8 inch internal hex drive accepts standard allen keys and hex bit drivers
• 1/2 inch overall length suits medium-depth engagement in shaft collars and hubs
• Headless design seats flush or below surface — no protrusion in rotating assemblies

Compatibility

Designed as a standard 1/4-28 UNF set screw suitable for use in any component tapped to accept a 1/4-28 thread, including shaft collars, pulleys, sprockets, and adjustable assemblies requiring a cup point fastener.

Installation Notes

Installation requires a 1/8 inch hex key or hex bit driver. Ensure the tapped hole is clean and free of debris before threading the screw in by hand to verify engagement before applying torque. Power down or de-energize any associated equipment before servicing fasteners on rotating components. Do not exceed the rated torsional capacity of the fastener — overtightening stainless set screws can cause galling; apply anti-galling compound when specified by the equipment manufacturer.