Value Collection 111321PR Set Screw 5/16-18 X 3/8 in Grade 8

Product Description

The VALUE COLLECTION 111321PR is a 5/16-18 x 3/8 inch knurled cup point set screw machined from Grade 8 alloy steel. Set screws of this type are fully threaded, headless fasteners used to secure a component — such as a pulley, gear, or collar — onto a shaft by applying clamping force through the point. The knurled cup point bites into the mating surface to resist rotation and axial movement. Drive is a 5/32 inch hex key socket. This fastener meets ASME/ANSI B18.3 and ASTM F912 standards, making it suitable for precision mechanical assemblies where torque retention and positive locking are required.

This set screw is appropriate for use in light industrial, HVAC, and mechanical equipment applications where shaft-to-hub connections must be secured reliably. Common installations include motor shaft collars, fan blade hubs, and drive pulleys in blower assemblies. The UNC thread form (5/16-18) is standard in North American mechanical systems. This fastener is sold individually with a minimum order quantity of 100 pieces, making it suitable for service shops and contractors stocking fasteners for field repairs or equipment assembly.

Key Features

• Knurled cup point provides positive grip and resists back-out under vibration
• Grade 8 alloy steel construction for high tensile and torsional strength
• 5/16-18 UNC thread for compatibility with standard North American tapped holes
• 5/32 inch hex drive accepts standard hex keys and Allen drivers
• Meets ASME/ANSI B18.3 and ASTM F912 dimensional and material standards
• Headless design sits flush or below the surface to eliminate snag hazards

Compatibility

Designed for use in any application requiring a 5/16-18 UNC threaded set screw with a knurled cup point and 5/32 inch hex drive, including shaft collars, pulleys, and mechanical couplings in HVAC blower assemblies and light industrial equipment.

Installation Notes

Installation is performed by mechanical technicians using a 5/32 inch hex key or Allen driver. Always ensure the tapped hole is clean and free of debris before threading the fastener. De-energize and lock out any rotating equipment before servicing shaft-mounted components. Do not exceed the rated torque range for the thread size and material grade as specified in applicable ASME standards.