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Busch® Burs - 90° Hart, ISO #040 Fig. 156C, 4.00 mm are expertly crafted from premium-grade tungsten vanadium steel, delivering outstanding durability, exceptional hardness, and resistance to wear. Engineered with precision in Germany, these burs provide jewelers with smooth, consistent, and accurate cutting performance that ensures professional results with every use. Featuring a specialized 90° Hart angle and a cross-cut design, this bur offers superior control and efficiency for intricate jewelry tasks such as prong shaping, metal edge refinement, cleaning, and delicate surface finishing. The 4.00 mm head diameter strikes an ideal balance between strength and fine detail capability, making it suitable for a wide range of metals including gold, silver, platinum, and other precious materials. With a 3/32" (2.38 mm) shank diameter and an approximate total length of 1-3/4" (44.5 mm), these burs are compatible with most rotary tools, flex shafts, and Dremel devices. The uniform, precision-machined teeth ensure clean, even cuts while minimizing vibration and chatter for maximum control and comfort during prolonged use. For optimal performance and to extend the lifespan of your burs, apply light pressure during operation and use in conjunction with a high-quality lubricant such as Busch Lube-Stik. Operating speeds recommended on the packaging should be adhered to for safe, effective results. After use, clean burs gently with a soft cloth to maintain their sharpness and precision.
Whether you are setting gems, shaping fine metal details, or performing general jewelry repair and polishing, these Busch® 90° Hart burs deliver reliable, high-performance results that meet the demanding standards of professional jewelers.
Brand: Busch®
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Type: 90° Hart Bur
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ISO Number: #040
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Size (Head Diameter): 4.00 mm
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Figure: 156C
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Cut Type: Cross-cut (for smoother and more controlled cutting action)
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Shape: Cylinder Square
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Shank Diameter: 3/32" (2.38 mm) — compatible with most rotary tools
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Overall Length: Approximately 1-3/4" (44.5 mm) — ergonomic for easy handling
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Material: High-grade tungsten vanadium steel for excellent hardness, durability, and long-lasting sharpness
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Precision Teeth: Uniformly spaced, precision-machined teeth for smooth, accurate cuts and minimal vibration
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Maximum Safe Speed: Specified on the packaging; varies by bur size to ensure safe operation and tool longevity
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Pack Quantity: 6 burs per pack, providing ample supply for regular professional use
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Country of Manufacture: Germany — known for exceptional engineering and quality craftsmanship
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Recommended Lubrication: Use with a lubricant such as Busch Lube-Stik to reduce friction, maintain sharpness, and prolong tool life
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Application: Ideal for detailed shaping, prong shaping, edge refinement, gem setting, polishing, and carving in jewelry making
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Compatibility: Fits most standard rotary tools, flex shafts, and Dremel devices with 3/32" collets
Additional
Information:
Busch® Burs are known in the jewelry industry for their exceptional
quality and precision. With uniformly spaced, precision-machined teeth,
these burs offer smooth, accurate cuts for detailed shaping and carving. Maximum
safe speed varies by bur size and is indicated on the box. Use with a
lubricant to extend tool life and optimize results.
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 Material: Made from durable tungsten vanadium steel for long-lasting performance and exceptional wear resistance.
- Precision-Cut Teeth: Uniformly spaced, precision-machined teeth deliver smooth, accurate cutting with minimal vibration for fine detail work.
- 90° Hart Angle: Engineered for optimal control and precision in intricate jewelry-making tasks such as prong shaping, carving, and edge refinement.
- Head Diameter: 4.00 mm, providing an ideal size for detailed work on small to medium-sized settings and components.
- Compatible Shank: Standard 3/32" (2.38 mm) shank fits most rotary tools, flex shafts, and Dremel devices for versatile use.
- Optimal Length: Approx. 1-3/4" (44.5 mm) total length allows comfortable handling and precise maneuverability.
- Cross-Cut Design: Ensures even cutting action and smooth finishing on a variety of materials including metals, alloys, and softer stones.
- Versatile Use: Suitable for gem setting, shaping, polishing, and detailed carving in jewelry making and metalworking.
- German Engineering: Crafted in Germany with rigorous quality standards known for precision, reliability, and durability.
- Pack Quantity: Includes 6 burs per pack, providing an ample supply for frequent use in professional and hobbyist settings.
- Lubrication Friendly: Recommended use with lubricants such as Busch Lube-Stik to reduce friction, extend tool life, and maintain sharpness.
- Safe Operating Speeds: Maximum safe speeds are indicated on the packaging to ensure optimal performance and prevent premature wear.
- Easy Maintenance: Designed for easy cleaning with a soft cloth after use to preserve sharpness and ensure consistent performance over time.
- Safety Reminder: Always wear appropriate eye protection when using burs to prevent injury from flying debris.
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