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The Busch® Fig 156C Hart 90° Burs Set (Sizes 01-12) is the premier choice for professional jewelers demanding precision, durability, and versatility. This comprehensive set of 12 burs is expertly crafted from premium tungsten vanadium steel, offering exceptional strength and long-lasting sharpness for intricate jewelry work.
Each bur features uniformly spaced, precision-machined teeth designed to deliver smooth, accurate cuts, essential for delicate tasks such as stone setting, prong shaping, channel, and flush setting. The 90° cutting angle is ideal for creating precise seats in prongs and achieving flawless metal cuts that enhance both design and diamond settings.
Renowned for their outstanding concentricity, Busch® burs ensure consistent, even cutting and finishing at any speed, making them perfectly suited for high-speed rotary tools. For optimal performance and longevity, it is recommended to use a lubricant such as Busch Lube-Stik to reduce friction and maintain the burs’ sharpness.
Manufactured in Germany, these burs uphold the highest standards of quality and craftsmanship, providing jewelers with reliable, long-lasting tools that deliver consistent results with every use.
Brand: Busch®
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Type: 90° Hart Burs Set
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Figure: 156C
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Sizes Included: 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12 (Full set of 12 burs)
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Material: High-grade Tungsten Vanadium Steel for superior hardness, wear resistance, and durability
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Shank Diameter: 3/32" (2.38 mm) – standard size for compatibility with most rotary tools, flex shafts, and micromotors
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Shank Length: Approximately 1.75" (44 mm) for optimal handling and reach in detailed work
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Head Diameter Range: Approximate sizes vary progressively from 0.10 mm (Size 01) to 0.31 mm (Size 12), providing versatility for fine to more substantial cuts
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Cutting Angle: 90° Hart angle designed for precise prong notching, seat cutting, channel setting, and bright cutting in metals
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Cut Type: Cross-cut teeth for smooth, consistent cutting and reduced clogging
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Recommended Operating Speed: Varies by bur size, generally between 15,000 to 30,000 RPM — refer to ANSI standards and packaging guidelines
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Lubricant: Use with Gesswein Lube-Stik or equivalent to reduce heat and friction, extending tool life
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Balance and Concentricity: Engineered for exceptional concentricity ensuring minimal vibration, precision, and smooth finish even at high speeds
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Manufacturing Origin: Precision crafted in Germany under stringent quality controls
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Application: Ideal for stone seat cutting, prong shaping, channel and flush setting, fine jewelry carving, and bright cutting of precious metals such as gold, silver, and platinum
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Packaging: Set of 12 burs neatly organized for easy identification and storage
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Safety Recommendations: Always wear eye protection during use and clean burs after operation to maintain performance and safety
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Features
90° Hart Shaped Burs: Specifically designed for precise stone setting, prong shaping, channel cutting, and detailed metalwork in fine jewelry.
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Precision-Cut Teeth: Uniformly spaced cross-cut teeth ensure smooth, consistent, and efficient metal removal with minimal clogging or chatter.
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Exceptional Concentricity: Engineered for superior balance and concentricity, providing vibration-free operation and flawless finishes at varying rotary speeds.
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Durable Tungsten Vanadium Steel: Made from premium-grade tungsten vanadium steel, these burs offer exceptional hardness, wear resistance, and long-lasting sharpness.
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Complete Size Range (01-12): Comprehensive set covering a wide range of bur diameters, suitable for everything from ultra-fine detailing to more robust cuts.
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Versatile Applications: Ideal for intricate tasks such as prong notching, seat cutting for stones, channel setting, bright cutting, and fine metal shaping on precious metals like gold, silver, and platinum.
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Compatible with Standard Rotary Tools: 3/32" (2.38 mm) shank fits most flex shafts, rotary handpieces, and micromotors for seamless integration into existing toolkits.
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Optimized for High-Speed Use: Designed to maintain performance and precision at speeds recommended by ANSI standards, enabling faster and more efficient work.
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Recommended Lubrication: Use with Gesswein Lube-Stik or equivalent lubricants to reduce heat, friction, and wear, maximizing tool life.
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Manufactured in Germany: Produced under rigorous quality control in Germany, ensuring superior craftsmanship, reliability, and consistency.
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Ergonomic Length: Approximately 1.75" (44 mm) total length provides excellent control and reach for detailed, delicate operations.
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Easy Identification and Storage: Comes in a well-organized set with clearly labeled sizes for quick selection and efficient workflow.
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Safety and Maintenance: Easy to clean and maintain, ensuring long-lasting sharpness; always recommended to wear protective eyewear during use for safety.
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