Value Collection 101591PR Set Screw 1/2-20 X 5/8 in Cup Point

Product Description

The VALUE COLLECTION 101591PR is a 1/2-20 UNF cup point set screw manufactured from Grade 8 alloy steel. Set screws are headless fasteners threaded along their full length, designed to secure a component — such as a collar, pulley, gear, or sprocket — against a shaft by applying direct compressive force at the point. The cup point configuration bites into the mating surface to resist rotational and axial movement. This screw measures 5/8 inches in overall length and is driven with a 1/4-inch hex key. It conforms to ASME/ANSI B18.3 and ASTM F912 standards, making it appropriate for demanding mechanical assemblies where holding strength and dimensional consistency are required.

This set screw is suited for use in industrial machinery, HVAC equipment, pumps, motors, and general mechanical assemblies where a shaft-to-hub connection must be locked in place. The 1/2-20 UNF thread provides a fine thread pitch for precise engagement and stronger thread strip resistance compared to coarse thread equivalents. Machinists, millwrights, and maintenance technicians working with rotating equipment or power transmission components are the primary installers. Minimum order quantity is 100 pieces.

Key Features

• Cup point tip bites into shaft material to resist axial and rotational slip
• 1/2-20 UNF fine thread for precise engagement and high thread strength
• Grade 8 alloy steel construction for high tensile and torsional load capacity
• 1/4-inch hex drive compatible with standard hex keys and Allen wrenches
• Conforms to ASME/ANSI B18.3 and ASTM F912 dimensional and material standards
• Headless design sits flush or below surface to eliminate protrusion hazards

Compatibility

Designed as a standard 1/2-20 UNF cup point set screw for use in any mechanical assembly specifying ASME/ANSI B18.3 or ASTM F912 compliant fasteners of this thread size and length.

Installation Notes

Installation is performed by machinists, millwrights, or qualified maintenance technicians using a 1/4-inch hex key or Allen-head driver. Always de-energize and lock out rotating equipment before installing or removing set screws. Apply appropriate thread-locking compound if the application requires resistance to vibration-induced loosening. Do not overtighten, as this can damage the shaft surface or strip the thread engagement.