Busch® Carbide Saws Bur

Separate grid partitions, cut micro-channels between pavé stones, and remove excess metal bridges without blade flex or tooth chatter. The Busch® 231AU Series Carbide Circular Saw Bur (Hartmetall-Säge) is an industrial-grade rotary micro-slitting instrument engineered for master diamond setters, fine goldsmiths, and precision micro-machinists working on complex pavé settings.

In high-density pavé layouts, drilling pilot holes with twist drills (such as 4205S-AU) and shaping seats leaves small grid-like metal webs between closely set gemstones. The 231AU series removes these residual metal bridges in a controlled pass, isolating stone seats and defining clean holding beads without accidental gouging. Featuring a 2.30 mm wheel diameter with peripheral serrated cutting teeth, the series comes in 5 calibrated blade thicknesses: 231AU (0.10 mm), 231F-AU (0.20 mm), 231FL-AU (0.30 mm), 231FXL-AU (0.40 mm), and 231FXXL-AU (0.80 mm). Machined from finest-grain solid tungsten carbide (Feinstkornhartmetall), Figure 231AU belongs to the HighTech-TOOL series, maintaining sharp cutting edges across platinum, titanium, 18K/14K white gold, and jewelry steel. Mounted on an industry-standard 2.35 mm (3/32") shank finished with a gold identification ring, each bur fits directly into jeweler flex shaft handpieces and precision bench micromotors. Supplied as a single-piece package (1 pc/pack).

Why Choose Busch® 231AU Carbide Saw Burs

• Dedicated Pavé Grid Separation: Cuts through grid-like metal webs between stone seats, isolating bead borders and removing excess metal cleanly.

• 5 Calibrated Kerf Thicknesses: Spans blade widths from ultra-thin 0.10 mm up to 0.80 mm, matching specific setting gaps and diamond spacing.

• Finest-Grain Solid Tungsten Carbide: Provides high torsional rigidity and wear resistance, maintaining edge sharpness across tough and abrasive alloys.

• Engineered for Difficult Alloys: Cuts through platinum, titanium, white gold, jewelry steel, yellow gold, and silver without tooth binding.

• HighTech-TOOL Gold Ring ID: Features the signature gold ring band on the neck for rapid identification on the workbench.

• Low-Vibration Concentric Operation: Precision-ground German shank minimizes radial runout, eliminating blade wobble and protecting thin kerf walls under microscope inspection.

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

Technical Specifications