Value Collection 601386PR Set Screw 9/16-18 X 1-1/4 in Cup Point

Product Description

The VALUE COLLECTION 601386PR is a cup point set screw designed for secure shaft-to-hub and collar-to-shaft clamping in mechanical assemblies. Manufactured from alloy steel to ASTM F912 and dimensioned to ASME/ANSI B18.3, it carries a 9/16-18 UNF thread with an overall length of 1-1/4 inches. The 1/4-inch hex drive accepts a standard hex key, and the cup point bites into the mating surface to resist rotation and axial movement under load. This fastener is suited for industrial maintenance, machine tool, and general mechanical applications where a headless locking screw is required.

This set screw is used in residential and commercial mechanical installations wherever a flush or recessed fastener is needed to lock rotating or sliding components in place. Typical applications include motor shafts, pulleys, gears, collars, and couplings across HVAC, pump, and light machinery assemblies. The UNF thread form provides a fine-pitch engagement that holds under vibration, making it a common choice for service technicians and millwrights performing shaft alignment and component replacement work.

Key Features

• Cup point geometry bites into the mating surface for positive rotational and axial locking
• Alloy steel construction meets ASTM F912 material grade for strength and hardness
• 9/16-18 UNF thread provides fine-pitch engagement and resistance to loosening under vibration
• 1/4-inch hex drive accepts standard hex keys for installation in confined spaces
• Headless design sits flush or below the mating surface, eliminating snag hazards
• Conforms to ASME/ANSI B18.3 dimensional standard for interchangeability

Compatibility

Designed as an OEM-style replacement or service fastener for any mechanical assembly requiring a 9/16-18 UNF cup point set screw dimensioned to ASME/ANSI B18.3.

Installation Notes

Installation is typically performed by maintenance technicians or millwrights using a calibrated hex key or T-handle driver sized at 1/4 inch. De-energize and lock out any connected machinery before removing or installing shaft fasteners. Ensure the mating bore and shaft surfaces are clean and free of debris before seating the cup point. Do not exceed the torque capacity of the hex socket; a rounded drive socket will compromise holding force and require fastener replacement.