Value Collection 601089PR Set Screw 4-40 X 7/8 in Cup Point

Product Description

The VALUE COLLECTION 601089PR is a 4-40 UNC cup point set screw manufactured from Grade 8 alloy steel. Set screws are headless fasteners that thread fully into a tapped hole to bear against a shaft, pin, or mating surface, holding components in place without protruding hardware. This screw measures 7/8 inches in overall length and uses a 0.050-inch hex key drive. It meets ASME/ANSI B18.3 and ASTM F912 standards, making it suitable for applications that require dimensional and mechanical consistency. Grade 8 alloy steel provides high tensile strength for demanding clamping and locking tasks.

This set screw is used in mechanical assemblies where a flush or recessed fastener is required to secure a collar, gear, pulley, or similar component to a shaft. Cup point geometry concentrates clamping force at a small contact area, creating an indent in the mating surface for a positive bite and resistance to rotation or axial movement. It is appropriate for use in industrial machinery, drive assemblies, and precision equipment across manufacturing, maintenance, and trade environments. Installation requires a 0.050-inch hex key.

Key Features

• 4-40 UNC thread for use in standard tapped holes requiring a fine-thread, small-diameter fastener
• Cup point geometry creates a firm bite on the mating shaft surface to resist movement
• Grade 8 alloy steel construction provides high tensile strength for demanding clamping loads
• Meets ASME/ANSI B18.3 and ASTM F912 standards for dimensional and mechanical conformance
• 0.050-inch hex key drive for installation in confined or recessed locations
• Headless design sits flush with or below the surface of the tapped component

Compatibility

Designed as an OEM-style replacement or standard-stock set screw for any assembly using 4-40 UNC tapped holes requiring a cup point, headless hex drive fastener at 7/8 inches overall length.

Installation Notes

Install using a 0.050-inch hex key; do not substitute a larger key size, as this risks rounding the drive socket. Ensure the tapped hole is clean and free of debris before threading. Torque to the assembly specification provided by the equipment manufacturer. For shaft-locking applications, verify the cup point contacts bare metal on the shaft to achieve full holding force.