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Engineered for accuracy and long-term performance, the Busch® 90° Hart Bur (ISO #029, Fig. 156C)-2.9 mm is crafted from high-grade tungsten vanadium steel, offering superior durability and cutting precision. Manufactured in Germany, these burs are the trusted choice of jewelers worldwide for tasks requiring clean, reliable cuts and professional-grade results. With a 90° Hart angle and a 2.90 mm head diameter, this bur is ideal for prong shaping, seat cutting, edge refinement, and other detailed metalwork in gold, silver, platinum, and more. Its 3/32" (2.38 mm) shank fits most standard rotary tools, including flex shafts and micromotors, while the 1-3/4" (44.5 mm) length provides optimal handling and control. For optimal performance, apply light pressure and use
with a high-quality lubricant to reduce friction and prolong sharpness. Safe
operating speeds are noted on the box, ensuring long-lasting, high-quality
results. Always clean the burs with a soft cloth after use to maintain their
sharpness, and wear protective eyewear to ensure safety during operation.
| Attribute |
Specification |
| Brand |
Busch® |
| Type |
90° Hart Bur |
| ISO Number |
#029 |
| Figure |
156C |
| Bur Shape |
Cylinder Square (90° Hart Angle) |
| Cut Type |
Cross-Cut |
| Head Diameter |
2.90 mm |
| Shank Diameter |
3/32" (2.38 mm) – standard size for rotary handpieces, flex shafts, and micromotors |
| Overall Length |
Approx. 1-3/4" (44.5 mm) |
| Material |
Premium Tungsten Vanadium Steel |
| Finish Type |
Precision-machined, cross-cut teeth for reduced clogging and smoother operation |
| Country of Origin |
Germany |
| Quantity |
Pack of 6 burs |
| RPM Range |
Variable – refer to packaging (generally up to 15,000–30,000 RPM based on size) |
| Compatibility |
Compatible with rotary tools, flex shafts, micromotors, and Dremel tools |
| Application |
Gem setting, prong cutting, seat shaping, engraving, edge refinement |
| Ideal Materials |
Gold, silver, platinum, palladium, brass, copper, and other soft to medium-hard metals |
| Lubrication |
Recommended – use Busch Lube-Stik or other quality bur lubricant |
| Storage Recommendation |
Store in dry, organized bur blocks or containers to prevent dulling or corrosion |
| Cleaning |
Wipe clean with a soft cloth or brush after use to maintain cutting performance |
Additional Information:
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German-Made Quality: Busch® is a globally recognized manufacturer known for precision engineering and consistent bur quality.
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Professional Grade: Designed specifically for jewelers, metalsmiths, and stone setters who need precision and long tool life.
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Safe Use Reminder: Always wear appropriate eye protection and follow tool manufacturer RPM guidelines. How
to Use:
Attach the bur securely to a rotary tool, flex shaft, or Dremel. For
best performance, apply light pressure and use with a lubricant such as Busch
Lube-Stik to minimize friction and maintain sharpness.
Safety
Information:
Always wear eye protection when using Busch® Burs. After each use, clean
the burs with a soft cloth to preserve their sharpness and ensure long-lasting,
consistent performance.
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Features
Premium Tungsten Vanadium Steel
Crafted from high-grade tungsten vanadium steel for outstanding durability, wear resistance, and long-lasting sharpness.
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Precision-Cut Teeth
Uniformly spaced, machine-cut teeth ensure smooth, clean, and vibration-free cuts across a variety of metals.
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90° Hart Angle (Cylinder Square Shape)
Engineered for maximum control in tight, detailed work—ideal for prong shaping, seat cutting, and fine metal carving.
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Head Diameter: 2.90 mm
Provides a balance of precision and strength, suited for detailed jewelry work and setting applications.
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Standard Shank: 3/32" (2.38 mm)
Compatible with most rotary tools, including flex shafts, micromotors, and Dremel-style handpieces.
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Optimized Length: Approx. 1-3/4" (44.5 mm)
Offers excellent handling, control, and reach for bench jewelers and stone setters.
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Cross-Cut Tooth Pattern
Enhances cutting efficiency, reduces clogging, and delivers a smoother finish on various metals and materials.
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Versatile Jewelry Application
Perfect for gem and diamond setting, prong work, shaping, polishing, and detailed engraving.
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German Precision Engineering
Manufactured in Germany to exacting standards—trusted by professional jewelers worldwide for reliability and consistency.
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Pack of 6 Burs
Includes six burs, providing jewelers with a practical and economical supply for repeated professional use.
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