Value Collection 101079PR Set Screw 4-40 X 3/8 in Cup Point

Product Description

The VALUE COLLECTION 101079PR is a cup point set screw designed for secure, no-protrusion fastening in mechanical assemblies. Sized at 4-40 UNC thread by 3/8 inches overall length, this screw is manufactured from Grade 8 alloy steel for high tensile strength and resistance to shear under load. The hex drive accepts a 0.050-inch hex key. It conforms to ASME/ANSI B18.3 and ASTM F912 dimensional and material standards. This fastener is installed by machinists, maintenance technicians, and mechanical tradespeople across a wide range of industrial and OEM assembly applications.

Cup point set screws like the 101079PR are used to lock collars, gears, pulleys, and shaft-mounted components in place without protruding above the mating surface. The cup point bites into the shaft surface to resist rotational and axial movement. This screw is suited for light-duty to medium-duty clamping applications where a recessed hex drive and compact form factor are required. It is commonly specified in HVAC equipment assemblies, pump drives, fan hubs, and precision mechanical devices where flush mounting is critical.

Key Features

• 4-40 UNC thread for fine-pitch engagement in small-diameter applications
• Cup point geometry bites into shaft surface to resist axial and rotational movement
• Grade 8 alloy steel construction provides high tensile and shear strength
• Hex socket drive accepts a 0.050-inch hex key for recessed installation
• Conforms to ASME/ANSI B18.3 and ASTM F912 standards
• Headless design sits flush or below the mating surface

Compatibility

Designed as a standard 4-40 UNC cup point set screw per ASME/ANSI B18.3, compatible with any tapped 4-40 threaded hole requiring a headless, hex-drive fastener of 3/8 inches overall length.

Installation Notes

Installation is performed with a 0.050-inch hex key; confirm the key is fully seated before applying torque to avoid rounding the socket. De-energize and lock out any rotating equipment before servicing shaft-mounted components secured by set screws. Do not reuse a set screw that shows deformation at the cup point, as holding force will be compromised. Minimum order quantity for this part is 100 pieces.