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Busch® 90° Hart Burs, ISO #045 Fig. 156C, 4.50 mm, are expertly crafted from high-grade tungsten vanadium steel, offering superior strength, wear resistance, and cutting performance. Each bur is precisely machined to deliver smooth, consistent, and chatter-free cuts, making it an essential tool for jewelers, stone setters, and fine metalworkers who demand precision and reliability. Manufactured in Germany, these burs are known industry-wide for their outstanding quality and durability. Designed with a true 90° Hart angle, this bur is ideal for performing delicate and detailed tasks such as prong notching, seat preparation for faceted stones, edge refinement, and clean, angled cuts in various metals. Its carefully engineered geometry allows for high control and clean finishes, even in tight or irregular settings. With a 3/32" (2.38 mm) shank diameter and a total length of 1-3/4" (44.5 mm), the bur is compatible with most standard rotary handpieces, micromotors, and flex shafts, making it suitable for a wide range of jewelry-making and stone-setting applications. The 4.50 mm head diameter offers a perfect balance of strength and precision, making it especially effective for medium to large stone settings.
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.
Brand: Busch®
Type: 90° Hart Bur
ISO Number: #045
Figure: 156C
Shape: Cylinder Square
Cut Type: Cross-Cut
Size: 4.50 mm
Shank Diameter: 3/32" (2.38 mm)
Length: Approx. 1-3/4" (44.5 mm)
Material: Tungsten Vanadium Steel
Quantity: Pack of 6
Product Overview:
Trusted by professional jewelers and metalsmiths worldwide, Busch® Burs are synonymous with precision, durability, and German-made quality. The 90° Hart Bur (ISO #045, Fig. 156C) is specifically engineered for stone setting, prong shaping, edge refinement, and other intricate detailing tasks.
The cross-cut tooth pattern ensures smoother and more efficient cutting, reducing resistance while improving control and material removal. Made from premium tungsten vanadium steel, these burs deliver long-lasting sharpness, excellent wear resistance, and consistent performance across a wide range of metals.
Key Features:
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Precision-engineered 90° Hart angle for creating accurate stone seats and prong notches
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Cross-cut teeth for smoother cutting action and reduced friction
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4.50 mm head diameter – suitable for medium to large-scale settings
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Compatible with most rotary tools, flex shafts, and Dremels
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3/32" (2.38 mm) shank diameter – standard size for jewelry applications
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Fig. 156C / ISO #045 – standardized for reliable sizing and fit
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Made in Germany – renowned for world-class tool manufacturing
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Comes in a pack of 6 – a reliable supply for frequent use
How to Use:
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Secure the bur in a compatible rotary tool, flex shaft, or micromotor handpiece.
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Use light, steady pressure to avoid overheating and extend tool life.
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Apply a high-quality lubricant, such as Busch® Lube-Stik, to minimize friction and improve cutting performance.
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Operate at speeds appropriate for the bur size (refer to packaging for maximum RPM guidelines).
Care & Safety:
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Always wear eye protection when using rotary tools.
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After each use, clean the bur with a soft cloth to remove debris and maintain sharpness.
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Store burs in a dry, protective case to avoid corrosion or damage.
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Replace worn burs promptly to maintain clean, precise results in your work.
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Features
Premium Material: Made from durable tungsten vanadium steel for exceptional strength, corrosion resistance, and long-lasting sharpness.
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Precision-Cut Teeth: Uniformly spaced, precision-machined cross-cut teeth deliver smooth, accurate, and chatter-free cutting for fine detailing.
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90° Hart Angle: Expertly designed for optimal control and precision in prong shaping, stone seat preparation, and detailed edge refinement.
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Head Diameter: 4.50 mm size provides ideal balance between strength and finesse for working in small to medium jewelry settings.
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Compatible Shank: Standard 3/32" (2.38 mm) shank fits most rotary tools, including flex shafts, micromotors, and Dremels for versatile use.
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Optimal Length: Approximately 1-3/4" (44.5 mm) total length ensures comfortable handling and precise maneuverability in tight spaces.
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Cross-Cut Design: Ensures efficient material removal, reduced heat buildup, and smooth finishes across a wide variety of metals and materials.
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Versatile Application: Perfectly suited for gemstone setting, prong shaping, carving, polishing, engraving, and delicate metal shaping.
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German Engineering: Manufactured in Germany with meticulous quality control to ensure consistent performance and durability.
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Pack Quantity: Includes 6 burs per package to provide an ample, cost-effective supply for professional workshops or hobbyists.
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Heat and Wear Resistant: Tungsten vanadium steel composition enhances resistance to wear and overheating, extending tool lifespan.
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Low Vibration Operation: Balanced design minimizes vibrations during use, allowing for greater comfort and precision in extended work sessions.
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Easy Maintenance: Designed for easy cleaning and re-sharpening to maintain peak performance over time.
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Safe Speed Guidelines: Maximum recommended operating speeds clearly indicated to optimize tool life and user safety.
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Application Compatibility: Ideal for use on precious metals (gold, silver, platinum), as well as other metals commonly used in jewelry fabrication.
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