Value Collection 409143BR Set Screw 7/8-9 X 3 in Cup Point

Product Description

The VALUE COLLECTION 409143BR is a cup point set screw used to secure components such as collars, pulleys, gears, and knobs onto shafts or into assemblies. Manufactured from alloy steel to Grade 2 material specification, this fastener features a 7/8-9 UNC thread and a 3-inch length measured under head. The square drive allows for reliable torque transfer with a standard square key or bit. Cup point geometry bites into the mating surface to resist rotational and axial movement without requiring a through-hole or additional hardware. Installers in mechanical, HVAC, and industrial maintenance trades stock this size for common shaft-retention applications.

This set screw is suited for general mechanical assembly and maintenance work across residential and commercial applications. Typical uses include locking shaft collars on fan assemblies, securing pulley hubs in belt-drive systems, and fastening couplings in pump or motor installations. The 7/8-9 coarse thread engages quickly and holds well in steel or cast iron tapped holes. The 3-inch length accommodates deeper boss depths or offset locking requirements not served by shorter fasteners.

Key Features

• 7/8-9 UNC coarse thread for fast engagement in standard tapped holes
• 3-inch length under head suits deep boss or extended shaft applications
• Cup point geometry creates a positive bite on shaft surfaces to resist rotation and axial shift
• Alloy steel construction provides strength suitable for mechanical clamping loads
• Square drive allows high torque input without cam-out risk
• Grade 2 material specification for consistent mechanical properties

Compatibility

Designed as a standard UNC replacement or stock set screw for mechanical assemblies requiring a 7/8-9 coarse thread, cup point, square drive fastener in alloy steel.

Installation Notes

Installation is performed by mechanics, millwrights, or HVAC technicians using a calibrated square key or square drive bit. Ensure the mating tapped hole is clean and free of debris before threading. Power down and de-energize any rotating equipment before servicing shaft-mounted components. Do not exceed the torque capacity of the square drive or the mating thread without engineering guidance.