Value Collection 101317P Set Screw 1/4-20 X 1/2 in Cup Point

Product Description

The VALUE COLLECTION 101317P is a 1/4-20 x 1/2-inch cup point set screw manufactured from Grade 8 alloy steel. Set screws are fully threaded fasteners with no head, designed to secure a component — such as a pulley, gear, or collar — onto a shaft by direct contact pressure. The cup point bites into the shaft surface to resist rotation and axial movement. Driven with a 1/8-inch hex key, this fastener meets ASME/ANSI B18.3 and ASTM F912 standards. It is commonly installed by millwrights, maintenance technicians, and mechanical contractors in a wide range of industrial and commercial equipment assemblies.

Cup point set screws in the 1/4-20 thread size are widely used in light to medium-duty shaft-locking applications across HVAC equipment, pumps, fans, motors, and general mechanical assemblies. The UNC/UNF-compatible threading and fractional-inch sizing make this fastener a standard choice for domestic machinery and equipment manufactured to inch-dimensioned specifications. Grade 8 alloy steel construction provides the hardness and tensile strength needed to hold under vibration and rotational load in demanding service environments.

Key Features

• Cup point geometry bites into shaft surface for secure, vibration-resistant locking
• Grade 8 alloy steel construction for high tensile strength and hardness
• 1/8-inch hex drive for use with standard Allen or hex key wrenches
• Meets ASME/ANSI B18.3 and ASTM F912 fastener standards
• UNC/UNF thread standard compatibility for broad domestic equipment fitment
• Fractional inch sizing for use in inch-dimensioned mechanical assemblies

Compatibility

Designed as a standard 1/4-20 UNC/UNF cup point set screw suitable for use in any application requiring a headless shaft-locking fastener in this thread size and length per ASME/ANSI B18.3 specifications.

Installation Notes

Set screws should be installed by qualified mechanical or maintenance technicians. De-energize and lock out all rotating equipment before installation or removal. Use a properly sized 1/8-inch hex key to avoid rounding the drive socket. Apply thread-locking compound if vibration is expected to cause loosening over time.