Niqua® 78 Tool Steel Burs Rounded Cylinder

Mill true flat surfaces, shape smooth radius transitions, and prepare contoured gemstone seats without gouging sharp internal corners. Manufactured to strict Swiss-Made standards for NIQUA, the NIQUA® SUPER Q® Rounded Cylinder Bur "78" (Walzenrundfräser / Bull-Nose Cylinder) is a heavy-duty rotary milling and finishing cutter engineered for professional goldsmiths, gemstone setters, and precision jewelry fabricators.

Combining the lateral squaring capacity of a standard cylindrical bur with the soft transitional blending of a hemispherical ball end, the Series 78 "bull-nose" geometry is an essential problem-solver at the jewelry bench. The rounded nose cuts gentle radius transitions on cavity floors and bezel shoulders, while the straight cylindrical flank levels vertical walls and guides straight linear passes without digging or chattering. Forged from premium hardened tool steel, each bur delivers clean chip evacuation and dependable edge retention in soft, ductile alloys including yellow gold, sterling silver, copper, brass, and related non-ferrous metals. Fitted with an industry-standard 2.35 mm (3/32") shank, these large rounded cylinder burs mount directly into jeweler flexible shaft handpieces, heavy-duty bench micromotors, and quick-change chuck systems. Available in substantial finishing diameters of 6.00 mm and 8.00 mm (Art.-No. 03 246 060 and 03 246 080), each size is packaged in a protective bench storage box containing 6 pieces.

Why Choose NIQUA® SUPER Q® 78 Rounded Cylinder Burs

• Distinctive Bull-Nose (Rounded Cylinder) Geometry: Features a straight cylindrical body terminating in a smoothly rounded dome tip, milling flat-bottom recesses while leaving rounded transitional corners.

• Eliminates Gouging & Stress Risers: The rounded end radius prevents the sharp corner gouges commonly produced by square-ended end mills, protecting structural integrity inside setting cavities.

• Dual-Action Milling: Uses the domed nose for curved surface contouring and concave cavity clearing, and the straight cylindrical flank for trueing vertical walls and channel rails.

• Deep Swarf Evacuation Flutes: Precision-ground flutes clear ductile metal shavings quickly outward during heavy stock removal, preventing tool loading and galling in gold and silver.

• Low-Vibration Concentric Operation: Precision-ground Swiss tool steel core minimizes radial runout, ensuring steady handpiece tracking and smooth, chatter-free cuts.

• Hardened Swiss-Quality Tool Steel: Provides edge sharpness, wear resistance, and long service life across continuous workshop use.

• Universal 2.35 mm (3/32") Shank: Provides seamless compatibility across standard flexible shaft systems, quick-change handpieces, and laboratory micromotors without collet adapters.