Niqua® 2C1 Tool Steel Burs Cup Bur

Round prongs effortlessly, dome delicate wire ends cleanly, and prevent ductile metal buildup with advanced swarf evacuation. Representing a new generation of precision jewelry tooling manufactured in Germany to strict European standards, the NIQUA® SUPER Q® "2C1" Cup Bur with Chip Evacuation Slot is engineered specifically for professional diamond setters, goldsmiths, and production jewelry manufacturers.

Unlike traditional closed-wall cup burs that trap shavings inside the cutting chamber, the Series 2C1 features an integrated lateral chip evacuation slot combined with an extra-deep, super-thin rim profile. As the bur rotates, metal cuttings are continuously discharged through the open slot, eliminating clogging, friction welding, and tool overheating when working with ductile precious metals like yellow gold, sterling silver, copper, and brass. Machined from premium hardened tool steel, the razor-sharp internal fluting produces uniform, rounded domes on prongs and wire rivets without leaving rough ridges or dragging. Mounted on an industry-standard 2.35 mm (3/32") shank, these burs drop directly into flexible shaft handpieces, brushless bench micromotors, and quick-change bench systems. Available in a calibrated diameter range from 0.80 mm to 2.30 mm (Item Codes: 03 237 008 to 03 237 023), each size is packaged in a bench storage box containing 6 pieces.

Why Choose NIQUA® SUPER Q® 2C1 Slotted Cup Burs

• Integrated Chip Evacuation Slot: Specially cut evacuation window prevents metal swarf from packing inside the cup, eliminating tool clogging and galling in gummy alloys. 

• Super-Thin Wall Profile: Ultra-fine rim thickness permits close positioning between tightly spaced stones without scraping girdle facets or adjacent prongs. 

• Extra-Deep Hemispherical Chamber: Deep internal cavity allows tall prong stems and long wire posts to be rounded smoothly down to size in one fluid pass. 

• Clean, Uniform Material Removal: Precision-ground tool steel teeth shape symmetrical, snag-free hemispherical domes on claws and wire ends without leaving a center pip. 

• Low-Vibration Concentric Operation: Precision-machined shank minimizes radial runout, ensuring smooth running and preventing tool bounce against delicate gemstone tables. 

• Hardened German Tool Steel: Delivers long-lasting edge retention, high wear resistance, and reduced heat buildup during intensive bench production. 

• Universal 2.35 mm (3/32") Shank: Provides seamless compatibility across all standard flexible shafts, quick-change handpieces, and laboratory micromotors.