Value Collection 409078PR Set Screw 3/8-16 X 2-1/2 in Cup Point

Product Description

The VALUE COLLECTION 409078PR is a cup point set screw designed for mechanical assemblies where a fastener must apply holding force without projecting above the workpiece surface. Sized at 3/8-16 UNC thread by 2-1/2 inches in length, this screw is driven with a square drive tool and seats a recessed cup point into the mating surface to resist rotation and axial movement. Made from Grade 2 steel with a bright, uncoated finish, it suits standard indoor mechanical and industrial applications. Machinists, millwrights, and maintenance technicians use cup point set screws for shaft collars, pulleys, sprockets, and similar mechanical components.

This set screw applies to general-purpose mechanical assemblies where a flush or recessed fastener is required. The 3/8-16 UNC thread is a common size found in shaft collar and hub assemblies across light industrial machinery, HVAC equipment, and mechanical drive systems. The cup point geometry creates a defined contact area that holds position under moderate torque and vibration without causing the same degree of surface damage associated with cone or oval point designs.

Key Features

• 3/8-16 UNC thread ensures compatibility with standard tapped holes in that size class
• 2-1/2 inch length measured under head for deep engagement applications
• Cup point geometry provides defined bite into mating surface for positive holding
• Square drive reduces cam-out risk during installation and removal
• Grade 2 steel construction suitable for moderate-load mechanical fastening
• Bright, uncoated finish for use in dry or lightly protected environments

Compatibility

Designed as a general-purpose replacement or stock set screw for 3/8-16 UNC tapped holes in shaft collars, hubs, pulleys, and similar mechanical assemblies.

Installation Notes

Installation requires a square drive wrench or bit sized to fit the socket. Always verify the tapped hole thread pitch and diameter before installation. De-energize and lock out any rotating machinery before servicing shaft-mounted components secured by set screws. Do not exceed the torque capacity appropriate to Grade 2 steel in this thread size, and inspect the cup point seating surface for damage before reinstalling in safety-critical assemblies.