Value Collection 101221PR Set Screw 8-36 X 5/16 in Cup Point

Product Description

The VALUE COLLECTION 101221PR is a cup point set screw designed for secure, friction-based fastening in mechanical assemblies. Manufactured from Grade 8 alloy steel, this screw provides high tensile strength and resistance to loosening under vibration and load. The cup point geometry bites into the mating surface to prevent rotational and axial movement without requiring a through-hole. It is driven with a 5/64-inch hex key and conforms to ASME/ANSI B18.3 and ASTM F912 standards. Machinists, maintenance technicians, and industrial assembly professionals commonly install this type of fastener in shafts, collars, pulleys, and gears across a wide range of equipment.

This set screw is suited for applications requiring a strong point-contact hold on shafts or cylindrical components in both light and heavy mechanical assemblies. The 8-36 UNF thread pitch makes it appropriate for fine-threaded tapped holes where precision engagement and holding force are priorities. It is commonly used in HVAC blower wheel hubs, pump shaft collars, motor couplings, and similar rotating or sliding assemblies found in trade and industrial settings. Minimum order quantity is 100 pieces per order.

Key Features

• Cup point geometry bites into mating shaft surface to resist rotation and axial movement
• Grade 8 alloy steel construction provides high tensile and torsional strength
• 5/64-inch hex drive for standard hex key or Allen wrench installation
• Fine UNF thread (8-36) for precise engagement in tapped holes
• Meets ASME/ANSI B18.3 and ASTM F912 dimensional and performance standards
• Overall length of 5/16 inches suits compact shaft-collar applications

Compatibility

Designed as a standard replacement or stock set screw for any tapped 8-36 UNF threaded hole requiring a cup point fastener per ASME/ANSI B18.3.

Installation Notes

Installation is performed using a 5/64-inch hex key; ensure the key is fully seated before applying torque to avoid rounding the drive socket. De-energize and lock out any equipment before accessing shaft collars, pulleys, or couplings. Verify the tapped hole is clean and free of debris before threading the screw. Follow applicable ANSI and equipment manufacturer guidelines for fastener engagement depth and preload.