Value Collection 409059PR Set Screw 5/16-18 X 7/8 in Cup Point

Product Description

The VALUE COLLECTION 409059PR is a cup point set screw designed for mechanical assemblies where a fastener must secure a shaft, collar, or component without a protruding head. Manufactured from Grade 2 alloy steel, this fastener measures 5/16-18 thread size with a 7/8-inch length measured under the head. The square drive accepts standard square-key drivers for reliable torque transfer. Cup point geometry bites into the mating surface to resist rotational and axial movement under load. This type of set screw is installed by machinists, millwrights, and maintenance technicians across industrial, HVAC, and mechanical equipment applications.

This set screw is suited for use in shaft collars, pulleys, gears, couplings, and similar mechanical components requiring a headless fastener. The 5/16-18 UNC thread standard ensures compatibility with standard tapped holes in that size. The cup point provides a moderate bite into softer shaft materials, making it a common choice for general-duty locking applications in rotating equipment. Minimum order quantity is 100 pieces per order, with individual package quantity of 1.

Key Features

• Cup point geometry grips shaft surface to resist axial and rotational movement
• Square drive for positive torque engagement with standard square-key tools
• Grade 2 alloy steel construction for reliable strength in general mechanical service
• 5/16-18 UNC thread for compatibility with standard tapped holes
• Headless design sits flush or below surface — no protrusion into clearance areas
• Length measured under head: 7/8 inch

Compatibility

Designed for use in standard 5/16-18 UNC tapped holes in shaft collars, pulleys, couplings, and similar mechanical assemblies requiring a cup point set screw.

Installation Notes

Set screws are installed by machinists, millwrights, and mechanical maintenance technicians. Disengage and lock out all rotating equipment before installing or removing set screws per applicable OSHA and equipment safety procedures. Use a properly fitted square-key driver to avoid stripping the drive recess. Do not exceed the torque capacity of the fastener grade — consult the relevant ASME or fastener manufacturer torque tables for 5/16-18 alloy steel set screws.