Value Collection MP40339 Set Screw 8-32 X 1/4 in Cup Point 50pk

Product Description

The VALUE COLLECTION MP40339 is a Grade 8 alloy steel set screw designed for securing components onto shafts, hubs, or threaded assemblies without a protruding head. This fastener features a cup point tip that bites into mating surfaces to resist rotation and axial movement under load. It is driven with a 5/64-inch hex key and meets ASME/ANSI B18.3 and ASTM F912 standards. The 8-32 UNC thread and 1/4-inch overall length make it well suited for light-to-medium duty clamping applications in mechanical assemblies. Each package contains 50 pieces.

Cup point set screws like the MP40339 are widely used across HVAC, refrigeration, electrical, and general mechanical applications wherever a flush or recessed fastener is required. Typical uses include securing pulleys, collars, gears, and knobs onto shafts, as well as locking adjustment mechanisms on equipment. The Grade 8 alloy steel construction provides higher tensile strength than standard steel fasteners, making these appropriate for applications with moderate vibration or clamping force requirements.

Key Features

• Cup point geometry bites into shaft or mating surface for positive grip and slip resistance
• Grade 8 alloy steel construction offers high tensile strength for demanding clamping applications
• 8-32 UNC thread provides broad compatibility with standard tapped holes in mechanical assemblies
• 5/64-inch hex drive allows installation with a standard hex key or Allen wrench in tight clearances
• Meets ASME/ANSI B18.3 and ASTM F912 dimensional and mechanical standards
• Sold in a 50-piece package for bench stock and service inventory

Compatibility

Designed as a standard 8-32 UNC set screw for use in any tapped hole conforming to ASME/ANSI B18.3 specifications with a 5/64-inch hex drive socket.

Installation Notes

Set screws are installed by mechanical technicians using a 5/64-inch hex key torqued by hand to manufacturer-specified values for the thread size and grade. Always de-energize and lock out equipment before accessing rotating components such as pulleys or collars. Avoid over-driving, which can strip the hex socket or damage the mating surface. Refer to applicable equipment service documentation for proper seating depth and torque requirements.