Value Collection 409054PR Set Screw 1/4-20 X 2-1/2 in Cup Point

Product Description

The VALUE COLLECTION 409054PR is a 1/4-20 x 2-1/2 inch cup point set screw manufactured from Grade 2 alloy steel. Set screws are fully threaded fasteners with no head — they seat flush or below the surface of the mating part and are driven by a square drive tool. This screw uses a UNC thread standard and a cup point tip, which bites into the shaft or surface it contacts to resist rotational movement. Measured length is taken under the head, consistent with standard headless fastener convention. Machinists, maintenance technicians, and assembly professionals install these in shaft collars, gears, pulleys, and similar mechanical assemblies where a secure, low-profile hold is required.

This set screw is suited for general industrial and mechanical assembly applications where a 1/4-20 UNC threaded socket is present. The cup point geometry provides a balance of holding power and minimal shaft damage compared to cone or knurl point variants, making it a common choice for rotating shaft assemblies in light to medium-duty mechanical systems. It is sold individually per package, with a minimum order quantity of 100 pieces, making it appropriate for production runs, shop stock replenishment, or MRO inventory programs.

Key Features

• 1/4-20 UNC thread for broad compatibility with standard tapped sockets
• Cup point tip provides reliable holding force while minimizing shaft surface damage
• Grade 2 alloy steel construction for strength in general-purpose mechanical applications
• Square drive type — requires square drive key or bit for installation and removal
• 2-1/2 inch length suitable for deeper engagement applications
• Fractional inch sizing; length measured under head per headless fastener standard

Compatibility

Designed as a standard 1/4-20 UNC cup point set screw for use in any component with a matching 1/4-20 tapped socket requiring a headless fastener with cup point geometry.

Installation Notes

Installation requires a properly sized square drive key or bit. Ensure the mating threaded hole is clean and free of debris before threading the screw in by hand to confirm proper thread engagement. Apply the appropriate torque for a 1/4-20 alloy steel set screw per your application or engineering specification — do not overtighten, as cup point set screws can deform the mating shaft surface. De-energize and lock out any rotating equipment before servicing components secured with set screws.