Value Collection 409146BR Set Screw 7/8-9 X 4.5 in Cup Point

Product Description

The VALUE COLLECTION 409146BR is a cup point set screw designed for mechanical fastening applications where a headless, flush-mount fastener is required. Manufactured from Grade 2 alloy steel, this screw measures 7/8-9 UNC thread by 4.5 inches in length, measured under the head. The square drive allows for positive torque transfer with minimal cam-out. Cup point geometry bites into the mating surface to resist axial and rotational movement. Machinists, millwrights, and mechanical assemblers install this type of fastener to secure collars, hubs, pulleys, and gears onto shafts.

This set screw is suited for use in industrial and commercial mechanical assemblies. Common applications include shaft-collar retention, pulley and sprocket locking, and positioning fixtures. The UNC thread form is standard across North American tooling and hardware, making this screw compatible with a wide range of tapped holes in metal components. It is used in both OEM manufacturing environments and maintenance and repair operations where frequent component adjustment or removal is needed.

Key Features

• 7/8-9 UNC thread form for compatibility with standard North American tapped holes
• Cup point tip bites into shaft surface to resist slippage under load
• Square drive allows high-torque installation with a square-key wrench
• Grade 2 alloy steel construction provides solid strength for general mechanical applications
• Headless design sits flush or below the surface of the tapped hole
• 4.5-inch length under head accommodates deep-engagement fastening requirements

Compatibility

Designed as a standard UNC set screw for use in any tapped 7/8-9 hole in mechanical assemblies requiring a cup point, headless fastener.

Installation Notes

Installation is performed with a square-key wrench sized to match the drive recess. Ensure the mating tapped hole is clean and free of debris before threading the screw. Apply thread-locking compound or follow engineering specifications for preload as required by the application. Do not exceed the rated torque range for Grade 2 alloy steel to avoid thread damage or screw failure.