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The Busch® 90° Hart Bur (ISO #033, Fig. 156C) crafted from premium tungsten vanadium steel, Busch® Burs deliver exceptional strength and durability for precision jewelry work. Engineered for smooth, consistent cuts, these burs are the trusted choice of jewelers demanding professional, reliable results. Manufactured in Germany, they are synonymous with high-quality craftsmanship and lasting sharpness.
Featuring a 90° Hart angle, these burs excel at intricate tasks such as prong shaping, edge refinement, and delicate finishing across various metals. With a 3/32" (2.38 mm) shank diameter and an approximate length of 1-3/4" (44.5 mm), they are compatible with most standard rotary tools. The 3.35 mm head diameter offers precise control, balancing durability with finesse.
For optimal performance, apply light pressure and use a high-quality lubricant to minimize friction and maintain bur sharpness. Safe operating speeds are provided on the packaging for long-lasting use. Always clean burs with a soft cloth after use and wear protective eyewear to ensure safety.
Brand: Busch®
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Type: 90° Hart Bur
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ISO Number: #033
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Size (Head Diameter): 3.30 mm
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Figure: 156C
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Cut Type: Cross-cut (for smoother, more efficient material removal)
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Shape: Cylinder Square (90° Hart Angle)
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Shank Diameter: 3/32" (2.38 mm) – fits most standard rotary tools
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Overall Length: Approx. 1-3/4" (44.5 mm)
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Material: High-grade tungsten vanadium steel – engineered for hardness, wear resistance, and extended sharpness
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Country of Manufacture: Germany
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Pack Quantity: 6 burs per pack
Additional
Information:
Busch® burs are trusted worldwide for their engineering precision, consistent cutting performance, and tool longevity. The 90° Hart angle combined with a cross-cut pattern makes this bur especially suitable for stone seat cutting, prong refinement, edge detailing, and metal sculpting in gold, silver, platinum, and other soft metals.
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Teeth Design: Uniformly spaced, precision-machined cross-cuts reduce clogging and friction.
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Tool Compatibility: Designed for use with rotary handpieces, flex shafts, micromotors, and Dremel-style tools. How
to Use:
- Mount securely in your rotary tool (ensure proper collet fit).
- Apply light, steady pressure—avoid forcing the bur into material.
- For optimal results, use with a high-quality cutting lubricant (e.g., Busch Lube-Stik or similar).
- Maintain proper RPM settings as specified by the manufacturer based on bur size and material.
Safety
Information:
Always wear eye protection and operate in a well-lit, controlled workspace.
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Clean burs after each use with a soft cloth or bur brush to maintain sharpness and remove debris.
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Store in a dry, secure case or bur block to avoid physical damage or corrosion.
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Features
Premium Material
Manufactured from high-grade tungsten vanadium steel for exceptional hardness, durability, and resistance to wear.
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Precision-Cut Teeth
Engineered with uniformly spaced cross-cut flutes to deliver clean, smooth, and vibration-free cuts with minimal effort.
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90° Hart Angle (Cylinder Square Shape)
Perfect for tight-angle cuts, precise prong shaping, and stone seat preparation in fine jewelry work.
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Head Diameter: 3.30 mm
Ideal for working on medium-to-large settings, bezels, and seats for diamonds and colored stones.
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Standard Shank Size: 3/32" (2.38 mm)
Universally compatible with most rotary tools, including Dremel®, Foredom®, micromotor, and flex shaft systems.
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Optimized Bur Length
Measures approximately 1-3/4" (44.5 mm) for excellent control, balance, and extended reach in detailed work.
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Cross-Cut Tooth Geometry
Provides faster material removal, reduced heat buildup, and enhanced surface finish on various metals.
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Versatile Applications
Ideal for gemstone setting, channel work, shaping, trimming, engraving, refining edges, and metal removal in gold, silver, platinum, and more.
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German Engineering Excellence
Designed and manufactured in Germany, offering unmatched quality control, tool longevity, and precision craftsmanship.
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Professional Grade
Trusted by master jewelers, bench professionals, stone setters, and metalsmiths globally.
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Compatible Materials
Works well on precious metals, non-ferrous metals, wax, plastics, and soft stone materials used in model-making.
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Economical Value Pack
Sold in a pack of 6 burs, providing a reliable, cost-effective supply for daily use or production settings.
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Lubrication Recommended
Extend tool life and reduce friction by using cutting lubricants such as Busch Lube-Stik during use.
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Consistent Performance
Delivers repeatable, high-precision results across multiple workpieces without degradation in quality.
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