Value Collection 101109PR Set Screw 5-40 X 1/8 in Cup Point

Product Description

The VALUE COLLECTION 101109PR is a cup point set screw designed for secure, flush fastening in mechanical assemblies where a protruding head is not acceptable. Threaded 5-40 UNC with an overall length of 1/8 inch, this fastener is driven by a 1/16 inch hex key and seats with a cup point that bites into the mating surface to resist rotation and axial movement. Manufactured from Grade 8 alloy steel, it meets ASME/ANSI B18.3 and ASTM F912 standards. Machinists, millwrights, and maintenance technicians use this type of fastener to lock collars, hubs, pulleys, and shafts in precision assemblies.

This set screw is suited for light-duty mechanical and electrical applications requiring a small-diameter, fine-pitch fastener. Typical uses include set screw collars, motor shaft retention, small gear hubs, and instrument assemblies where a No. 5-40 thread is specified. The cup point provides a positive bite without requiring a through-hole, making it practical for components that must be repositioned during service. Grade 8 alloy steel construction supports use in applications where higher hardness and shear resistance are required compared to standard steel fasteners.

Key Features

• 5-40 UNC thread with 1/8 inch overall length for compact, flush-mount fastening
• Cup point geometry bites into mating surface to resist rotation and axial load
• 1/16 inch hex drive for use with standard hex keys in confined spaces
• Grade 8 alloy steel construction for elevated hardness and shear resistance
• Meets ASME/ANSI B18.3 and ASTM F912 dimensional and material standards

Compatibility

Designed as an OEM-style replacement or stock fastener for mechanical assemblies specifying a No. 5-40 UNC cup point set screw with a 1/16 inch hex drive.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a 1/16 inch hex key. Ensure the mating shaft or bore surface is clean and free of burrs before seating the cup point. De-energize or lock out any rotating equipment per applicable LOTO procedures before installing or removing set screws. Do not exceed the fastener thread engagement depth, and avoid over-torquing small-diameter set screws to prevent thread stripping.