Value Collection 409145BR Set Screw 7/8-9 X 4 in Cup Point Steel

Product Description

The VALUE COLLECTION 409145BR is a cup point set screw designed for mechanical assemblies that require a reliable, low-profile fastener to lock shafts, collars, pulleys, and similar components in place. Manufactured from Grade 2 steel with a bright, uncoated finish, this screw measures 7/8-9 thread size at 4 inches in length and follows the Unified National Coarse (UNC) thread standard. The cup point geometry bites into the mating surface to resist rotation and axial movement under load. This fastener is installed using a square drive and is commonly handled by millwrights, mechanical contractors, and maintenance technicians working on rotating equipment and power transmission systems.

This set screw is suited for use in residential and industrial mechanical applications where a headless fastener is needed to secure a component to a shaft without protruding above the surface. Typical applications include securing shaft collars, sprockets, gears, and couplings on light-duty to medium-duty machinery. The UNC thread form is compatible with standard tapped holes commonly found in mechanical hardware across North American equipment.

Key Features

• Cup point geometry bites into mating shaft surface for firm axial and rotational holding
• 7/8-9 UNC thread standard ensures compatibility with commonly tapped holes in mechanical assemblies
• Grade 2 steel construction suitable for general-purpose mechanical fastening applications
• Bright, uncoated finish — no coating thickness to account for in tight-tolerance fits
• 4-inch length provides deep thread engagement for higher clamping loads
• Square drive for positive tool engagement during installation and removal

Compatibility

Designed as a general-purpose UNC set screw for use in any standard 7/8-9 tapped hole in mechanical power transmission components such as shaft collars, pulleys, gears, and couplings.

Installation Notes

Installation is typically performed by millwrights or mechanical maintenance technicians using a square drive key or bit. De-energize and lock out all rotating equipment before servicing any shaft-mounted components. Torque to the assembly or equipment manufacturer specification for the thread size and grade. Do not over-tighten, as cup point set screws can deform soft shaft materials if excess force is applied.