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The Busch® 90° Hart Bur (ISO #031, Fig. 156C) is expertly crafted in Germany from premium tungsten vanadium steel, ensuring superior strength, edge retention, and long-term durability. These precision-engineered burs are a staple for professional jewelers who require consistently clean, smooth cuts in fine metalwork. Featuring a 90° Hart angle and a 3.10 mm head diameter, this bur is ideal for a wide range of applications, including prong shaping, seat cutting, edge refinement, and other detailed work in precious and non-precious metals. Its 3/32" (2.38 mm) shank fits most rotary tools, including flex shafts and micromotors, while the 1-3/4" (44.5 mm) length provides excellent control and handling. 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 |
Details |
| Brand |
Busch® |
| Type |
90° Hart Bur |
| ISO Number |
ISO #031 |
| Figure |
Fig. 156C |
| Bur Shape |
Cylinder Square (90° Hart Angle) |
| Cut Type |
Cross-Cut – promotes smooth cutting and efficient chip removal |
| Head Diameter |
3.10 mm |
| Shank Diameter |
3/32" (2.38 mm) – compatible with most flex shafts, micromotors, and rotary tools |
| Overall Length |
Approx. 1-3/4" (44.5 mm) |
| Material |
Tungsten Vanadium Steel – long-lasting sharpness, reduced wear |
| Finish Type |
Precision-machined, uniformly spaced teeth |
| Cutting Direction |
Right-hand spiral |
| Country of Origin |
Germany – renowned for quality and precision tooling |
| Pack Quantity |
6 burs per pack |
| Application |
Prong cutting, gem setting, seat shaping, metal carving, fine detailing |
| Ideal Materials |
Gold, silver, platinum, palladium, brass, copper, and other soft/medium metals |
| Lubrication Use |
Recommended – extends tool life and improves cutting efficiency |
| Recommended Lubricant |
Busch Lube-Stik or similar jewelry-grade lubricants |
| Max RPM |
Refer to product packaging (varies by bur size) |
| Tool Compatibility |
Rotary tools, flex shafts, Dremel-style tools, micromotors |
| Storage Suggestion |
Store in bur blocks or cases to prevent damage and contamination |
Additional
Information:
Cross-Cut Teeth Design: Reduces clogging and improves cutting efficiency, especially in tougher metals.
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Professional-Grade Tool: Trusted by jewelers, metalsmiths, and stone setters for critical bench work.
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Economical Packaging: Pack of 6 allows for convenient replacements and workflow continuity.
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
High-Performance Material
Made from premium tungsten vanadium steel for superior durability, edge retention, and long-lasting sharpness in precision tasks.
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Precision-Cut Tooth Pattern
Uniformly spaced, machine-cut teeth provide smooth, accurate, and consistent cutting with reduced vibration and improved control.
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90° Hart Angle (Cylinder Square Design)
Specialized geometry allows for tight-angle cutting, prong shaping, and detailed stone seat preparation.
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Head Diameter: 3.10 mm
Offers optimal control for medium-to-large stone settings and other detailed jewelry work.
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Standard Shank Size: 3/32" (2.38 mm)
Universally compatible with most rotary tools, flex shafts, and micromotor handpieces.
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Tool Length: Approx. 1-3/4" (44.5 mm)
Ideal length for enhanced balance and handling during extended use.
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Cross-Cut Design
Enhances chip removal, reduces friction, and delivers a refined surface finish on a variety of materials, including gold, silver, and platinum.
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Versatile Applications
Excellent for gem setting, prong cutting, shaping, seat carving, and polishing tasks in both precious and non-precious metals.
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Precision German Manufacturing
Crafted in Germany under rigorous quality control for exceptional performance and consistency trusted by jewelers worldwide.
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Value Pack of 6 Burs
Comes in a set of six for convenient replacement and extended use at the bench.
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