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Designed for jewelers and metalworkers who demand both strength and precision, the Busch® 90° Hart Bur ISO #042 (Fig. 156C, 4.20 mm) is crafted from high‑grade tungsten vanadium steel. Born of German engineering tradition, this bur delivers smooth, even cutting performance with long‑lasting sharpness and reliability. With a 90° Hart (cylinder square) profile and cross‑cut teeth, this bur excels at heavy duty and delicate tasks alike—prong shaping, seat cutting, edge refinement, chamfering, and final finishing across a variety of metals. The 4.20 mm head diameter gives you substantial material removal capability without sacrificing control. 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®
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Type: 90° Hart Bur
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ISO Number: #042
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Size (Head Diameter): 4.20 mm
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Figure: 156C
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Cut Type: Cross-cut
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Shape: Cylinder Square
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Shank Diameter: 3/32" (2.38 mm) – compatible with most rotary tools and flex shafts
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Overall Length: Approx. 1-3/4" (44.5 mm)
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Material: High-grade tungsten vanadium steel
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Quantity: Pack of 6 burs
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Country of Origin: Germany
Updated Additional Information:
Precision & Performance:
Busch® burs are engineered for exceptional performance in professional jewelry work. The precision-ground, cross-cut teeth deliver clean and consistent cuts while minimizing tool chatter and heat buildup. Each bur undergoes rigorous quality control to ensure dependable, repeatable results.
Durability:
Crafted from premium tungsten vanadium steel, these burs offer superior edge retention and are resistant to wear, even with continuous use on hard metals.
Applications:
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Gem setting and prong shaping
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Undercutting and seat creation
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Metal engraving and edge refinement
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Fine detailing in gold, silver, platinum, and other jewelry metals
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Ideal for use in both traditional and contemporary metalsmithing techniques
Tool Compatibility:
Can be used with:
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Rotary handpieces
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Dremels
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Flex shafts
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Micromotors
How to Use:
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Insert the bur fully into your tool's collet or chuck for a secure fit.
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Operate at the recommended RPM (refer to the packaging or manufacturer's guide for optimal speed).
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Use light pressure—let the tool do the work.
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Apply a suitable lubricant such as Busch® Lube-Stik to reduce friction, heat, and wear.
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After use, clean with a soft brush or cloth and store dry.
Safety Information:
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Always wear eye protection and follow general shop safety procedures.
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Keep hands dry and ensure a stable grip when using.
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Do not exceed the recommended RPM.
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Store in a dry, protective case to prevent damage or rust.
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Keep out of reach of children and untrained users.
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Features
Premium Tungsten Vanadium Steel: Manufactured from high-quality tungsten vanadium steel for maximum strength, sharpness retention, and resistance to wear.
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Precision-Cut Teeth: Uniformly spaced and cross-cut for clean, controlled cutting with minimal clogging or chattering during use.
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90° Hart Angle (Fig. 156C): Designed specifically for prong shaping, undercutting, and detailed gem seat work in jewelry settings.
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4.20 mm Head Diameter: Ideal for precise metal removal and shaping in medium to large-scale jewelry designs.
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Cross-Cut Design: Enhances chip removal and reduces friction heat, allowing smoother finishes across gold, silver, platinum, and other metals.
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3/32" (2.38 mm) Shank: Compatible with most standard handpieces, rotary tools, flex shafts, and micromotor systems.
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Optimal Length: Measures approximately 1-3/4" (44.5 mm), offering easy control and balance during delicate operations.
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Versatile Use: Excellent for gem setting, shaping bezels, seat cutting, edge finishing, engraving prep, and general metalsmithing.
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German Engineering: Manufactured in Germany to exacting standards — trusted worldwide for precision and reliability in fine jewelry applications.
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Value Pack of 6: Provides efficiency and convenience for professional jewelers, with backup burs ready when needed.
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Safe Operating Speeds Indicated: Each pack includes manufacturer guidelines to ensure optimal RPM usage and tool longevity.
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Lubrication Recommended: Use with cutting lubricant (e.g. Busch® Lube-Stik) to extend tool life and improve cutting efficiency.
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