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Experience the perfect blend of precision, performance, and durability with the Busch® 90° Hart Bur, ISO #027 Fig. 156C, 2.70 mm. Expertly crafted in Germany from high-grade tungsten vanadium steel, these burs are built to deliver long-lasting strength and sharpness, even under demanding conditions. Engineered for jewelers who require consistent, clean cuts, each bur undergoes strict quality control to ensure smooth, vibration-free operation. The 90° Hart shape makes it ideal for prong cutting, seat shaping, edge refinement, and other fine detail work on both precious and non-precious metals. 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® |
| Product Type |
90° Hart Bur |
| ISO Number |
#027 |
| Figure Number |
156C |
| Head Diameter |
2.70 mm |
| Cut Type |
Cross-cut |
| Bur Shape |
Cylinder Square (Hart shape, 90° angle) |
| Material |
Premium Tungsten Vanadium Steel |
| Shank Diameter |
3/32" (2.38 mm) – fits most rotary handpieces and flex shafts |
| Overall Length |
Approx. 1-3/4" (44.5 mm) |
| Quantity |
Sold in Packs of 6 |
| Country of Origin |
Germany |
| Compatible Tools |
Rotary tools, flex shafts, Dremel, micromotors |
| Recommended Lubricant |
Busch Lube-Stik or other high-quality bur lubricants |
| Maximum RPM |
Varies by bur size – refer to packaging for safe operating speeds |
Key Features:
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Precision-machined, uniformly spaced teeth for smooth, accurate cuts
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Ideal for prong shaping, stone setting, seat cutting, and edge refinement
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Hardened steel construction ensures long-lasting sharpness and durability
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Cross-cut pattern reduces clogging and provides better control during use
Usage Instructions:
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Insert the bur securely into your rotary tool or flex shaft collet.
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Apply light, consistent pressure—do not force the bur.
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Use with lubricant to minimize friction and heat buildup.
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Operate within the safe RPM range indicated on the packaging.
Safety & Maintenance:
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Always wear protective eyewear when operating rotary tools.
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After use, clean burs with a soft cloth to remove metal particles and debris.
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Store in a dry, protective container to prevent damage and maintain sharpness.
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Features
Premium Tungsten Vanadium Steel:
Engineered from high-grade tungsten vanadium steel for exceptional hardness, durability, and long-lasting sharpness—ideal for daily use in demanding jewelry applications.
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Precision-Cut, Uniform Teeth:
Machined with precision-aligned, uniformly spaced teeth to deliver smooth, clean, and accurate cuts with minimal vibration or chatter.
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90° Hart Angle Design:
Features a true 90-degree Hart (cylinder square) profile—perfect for detailed work like prong shaping, stone seat cutting, edge refinement, and tight-angle carving.
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Accurate Head Size – 2.70 mm:
Provides excellent control and visibility in small, intricate settings while maintaining durability and cutting power.
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Industry-Standard Shank – 3/32" (2.38 mm):
Universally compatible with most rotary tools, including flex shafts, micromotors, and Dremel-style handpieces.
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Optimized Length – 1-3/4" (44.5 mm):
Offers superior handling and reach, giving jewelers better maneuverability and balance during fine-detail work.
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Cross-Cut Tooth Pattern:
Enhances chip removal and reduces heat buildup while delivering a consistent finish across a wide range of metals and materials.
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Versatile Application:
Ideal for gem setting, prong cutting, fine shaping, edge smoothing, and polishing—suitable for gold, silver, platinum, and more.
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Precision German Craftsmanship:
Manufactured in Germany under strict quality standards, ensuring unmatched reliability, performance, and lifespan.
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Value Pack of 6 Burs:
Includes six high-quality burs—perfect for professionals looking for a ready supply of precision tools.
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