Value Collection 111267PR Set Screw 1/4-28 X 5/16 in Knurled Cup

Product Description

The VALUE COLLECTION 111267PR is a 1/4-28 x 5/16 inch knurled cup point set screw manufactured from Grade 8 alloy steel. Set screws are headless fasteners that seat flush with or below the surface of a component, locking shafts, collars, pulleys, and hubs in position against rotation or axial movement. The knurled cup point bites into the mating surface to increase holding force without requiring adhesives. The 1/8 inch hex drive accepts a standard hex key for installation in confined spaces. This fastener meets ASME/ANSI B18.3 and ASTM F912 standards, making it appropriate for use in mechanical assemblies where consistent clamping load and dimensional accuracy are required.

This set screw is suited for light-to-medium duty mechanical applications including HVAC equipment shaft collars, motor couplings, fan hubs, and general industrial assemblies. The 1/4-28 UNF thread provides finer thread engagement than coarse-thread equivalents, offering better vibration resistance in applications subject to cyclic loading. Technicians and machinists working on rotating equipment, control linkages, and precision assemblies will find this fastener appropriate for locations where a flush-mount locking fastener is required and surface contact must be maintained.

Key Features

• 1/4-28 UNF thread for fine-pitch engagement and improved vibration resistance
• Knurled cup point design bites into mating shaft surface to increase torque retention
• Grade 8 alloy steel construction for high tensile and shear strength
• 1/8 inch hex drive fits standard hex keys for installation in tight clearances
• Meets ASME/ANSI B18.3 and ASTM F912 dimensional and performance standards
• Headless design allows flush or sub-flush installation

Compatibility

Designed as a standard 1/4-28 UNF knurled cup point set screw per ASME/ANSI B18.3, suitable for use wherever a Grade 8 alloy steel headless set screw of this thread size and length is specified.

Installation Notes

Installation is performed with a 1/8 inch hex key; ensure the key is fully seated in the drive recess before applying torque to avoid rounding. De-energize and lock out all rotating equipment before installing or removing set screws on shafts or couplings. Inspect the mating shaft surface for burrs or damage prior to installation, as surface condition affects holding force. Follow applicable machinery safety codes and the equipment manufacturer's torque guidance for this thread size and grade.