Niqua® 138 Tungsten Carbide Burs Cone

Machine refractory precious metals, shape hard alloy mountings, and square setting seats with continuous line-of-sight and zero tool deflection. Manufactured to Swiss-Made precision standards for NIQUA, the NIQUA® SUPER Q® Series "138" Tungsten Carbide Cone Bur (Tapered Flat / Kegelfräser) is a heavy-duty rotary milling instrument engineered for diamond setters, goldsmiths, fine engravers, and precision toolmakers.

Featuring a micro-grain tungsten carbide cutting head brazed onto a precision-ground stainless steel shank, the Series 138 combines the depth-leveling control of a flat cylinder with the tapered sidewall clearance of a cone. While traditional tool steel burs dull quickly when machining tough, work-hardened metals, this solid carbide head cuts aggressively through platinum, white gold, stainless steel, titanium, glass, and ceramics without losing its cutting geometry. The cross-cut fluting clears chips rapidly to ensure smooth, low-vibration operation and a clean surface finish during delicate setting and engraving tasks. Built with an industry-standard 2.35 mm (3/32") shank, these conical carbide burs mount directly into jeweler flexible shaft handpieces, brushless bench micromotors, and quick-change bench systems. Offered in a calibrated size progression from 0.80 mm to 2.30 mm (Art.-No. 03 245 008 to 03 245 023), each size is packaged in a bench storage box containing 6 pieces.

Why Choose NIQUA® SUPER Q® 138 Tungsten Carbide Cone Burs

• Micro-Grain Tungsten Carbide Head: Provides high abrasion resistance and heat tolerance, outlasting conventional tool steel burs by up to 10 times in tough alloys.

• Tapered Body with Flat End Geometry: The conical body provides visibility and access in confined setting areas, while the flat end face levels bearing floors without gouging.

• Cross-Cut Chip Evacuation Flutes: Engineered flutes break chips into fine particles, preventing tooth packing and metal galling in soft gold as well as tough titanium.

• Multi-Material Machining Capability: Cuts cleanly through platinum, 18K/14K white gold, silver, stainless steel, titanium, glass, and ceramics.

• Low-Vibration Concentric Operation: Precision-ground Swiss construction minimizes radial runout, eliminating tool chatter under microscope magnification.

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

Size Selection Guide