Value Collection 409119BR Cup Point Set Screw 5/8-11

Product Description

The VALUE COLLECTION 409119BR is a cup point set screw designed to secure components onto shafts, rods, and assemblies where a flush or recessed fastener is required. This screw features a square drive and a cup point tip that bites into the mating surface to resist rotation and axial movement under load. Manufactured from Grade 2 alloy steel, it delivers the hardness and shear strength needed for demanding mechanical and industrial applications. At 2-3/4 inches in length with a 5/8-11 UNC thread, it suits medium-to-heavy clamping requirements encountered in machine building, maintenance, and trade fabrication work.

This set screw is used in applications where a headless fastener must sit flush with or below a surface — common in shaft collars, pulleys, gears, sprockets, and mounting hubs. The 5/8-11 UNC thread size is a widely used coarse-thread standard in industrial and mechanical assemblies. The cup point geometry creates a small indentation in the mating shaft, providing positive holding force without the need for additional locking hardware. Machinists, millwrights, pipefitters, and maintenance mechanics routinely specify this type of fastener for rotating equipment and structural assemblies.

Key Features

• Cup point tip bites into mating surface for positive rotational and axial hold
• Square drive for positive torque transfer with standard square-drive bits or keys
• 5/8-11 UNC coarse thread for broad compatibility with standard tapped holes
• Grade 2 alloy steel construction for hardness and shear strength in mechanical applications
• Headless design sits flush with or below the workpiece surface
• 2-3/4 inch length accommodates deeper engagement requirements

Compatibility

Designed as a standard headless cup point set screw for any tapped hole conforming to 5/8-11 UNC thread specifications in shaft collars, hubs, pulleys, gears, and similar mechanical assemblies.

Installation Notes

Installation requires a properly sized square drive key or bit; use of an ill-fitting drive can strip the socket and damage the fastener. Ensure the receiving tapped hole is clean and free of debris before threading in the screw. Apply appropriate thread lubricant or anti-seize compound where operating temperatures or material combinations warrant it. Torque to the fastener manufacturer's specification for the thread size and grade — do not over-drive, as the cup point can fracture the mating shaft surface if excessive force is applied.