Value Collection 101171PR Set Screw 6-40 X 1/4 in Cup Point

Product Description

The VALUE COLLECTION 101171PR is a cup point set screw designed for precision fastening applications requiring a secure, mar-resistant hold. Manufactured from Grade 8 alloy steel, this screw uses a 1/16-inch hex drive and meets ASME/ANSI B18.3 and ASTM F912 standards. The 6-40 UNF thread pitch and 1/4-inch overall length make it well-suited for small-bore, tight-tolerance assemblies where a standard socket head cap screw would not fit. The cup point geometry bites into the mating shaft to resist rotation and axial movement. Machinists, millwrights, and mechanical contractors typically install these fasteners in motor shafts, collar-and-hub assemblies, and precision instrument components.

This set screw is used in residential and commercial mechanical assemblies where small-diameter, fine-thread fastening is required. Typical applications include shaft collars, pulleys, gears, and knobs where the fastener must sit fully flush or below the surface of the host component. The 6-40 UNF thread designation indicates a fine-thread engagement suitable for thin-walled or close-tolerance tapped holes. It is commonly specified in HVAC blower assemblies, small pump components, and light-duty machine elements requiring repeatable, tool-tight installation.

Key Features

• Grade 8 alloy steel construction for high tensile strength and hardness
• Cup point geometry provides positive bite into shaft material, resisting rotational slip
• 6-40 UNF fine-thread engagement suits close-tolerance tapped holes
• 1/16-inch hex drive compatible with standard hex keys and T-handle drivers
• Meets ASME/ANSI B18.3 and ASTM F912 dimensional and mechanical standards
• Fully headless profile allows flush or sub-flush installation in host bores

Compatibility

Designed as an OEM-style replacement or service fastener for any assembly requiring a 6-40 UNF cup point set screw with a 1/16-inch hex drive and 1/4-inch overall length.

Installation Notes

Installation is typically performed by machinists, millwrights, or mechanical contractors using a 1/16-inch hex key or T-handle driver. Ensure the mating tapped hole is clean and free of debris before threading. De-energize and lock out any rotating equipment before servicing shaft-mounted components. Avoid over-torquing, as the small drive size can round out under excessive force.