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The Busch® Burs – Twist Drills, Fig. 77 - 1.40mm (ISO #014) offer exceptional precision, strength, and durability, making them a vital tool for professional jewelers, watchmakers, and artisans working in fine detail. Crafted in Germany to the highest standards, these twist drills are designed to perform clean, accurate cuts on a wide range of materials.
Each Busch® Fig. 77 Twist Drill measures 1.40mm (0.0551") in diameter and is manufactured from premium tungsten vanadium steel, ensuring long-lasting sharpness and resistance to wear. The precision-machined, uniformly spaced flutes enable smooth, chatter-free drilling, even on delicate materials.
With a 3/32" shank (2.35mm) and an overall length of approximately 1.75", these drills are compatible with most rotary tools, including Dremel®, Foredom®, flex shafts, and micromotor systems.
Brand: Busch®
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Figure Number: 77
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Diameter: 1.40mm (0.0551”)
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ISO Classification: #014
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Material: Tungsten Vanadium Steel
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Shank Size: 3/32" (2.35mm) diameter, approx. 1.75” (44.5mm) length
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Shape: Twist Drill
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Material Quality: High-grade steel for superior durability and performance
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Package Contents: 6 twist drills
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Quantity: 6 drills per pack
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Country of Origin: Germany
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Applications: Designed for use on metals, gemstones, ceramics, plastics, and other hard materials
About this Item:
Busch® Twist Drills Fig. 77 – 1.40mm are manufactured in Germany using premium tungsten vanadium steel, offering exceptional strength, durability, and precision. These drills feature uniformly spaced, precision-ground flutes that deliver smooth, accurate cuts with minimal vibration—making them ideal for professional jewelers, artisans, and watchmakers.
Their fine teeth and consistent cutting edges provide reliable performance, even at lower speeds, making them perfect for detailed and delicate work such as stone setting and jewelry repair.
How to Use:
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Attach the twist drill to a rotary tool such as a flex shaft, micromotor, or Dremel®
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Apply gentle, consistent pressure—do not force the tool
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Use a cutting lubricant (e.g., Busch Lube-Stik) to reduce heat, prevent wear, and extend the tool’s life
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Operate within the recommended speed range of 1,400 – 10,000 rpm
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For best results, consult ANSI guidelines for speed and safety based on material
Safety Information:
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Always wear protective eyewear when using burs or rotary tools
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Keep hair, loose clothing, and hands clear of rotating parts
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After use, clean burs with a soft cloth and mild soap, or use an ultrasonic cleaner
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Store drills in a dry, secure case to prevent dulling or corrosion
Why Choose Busch®?
With over 100 years of engineering expertise, Busch® is a globally trusted brand among jewelry professionals. Known for German craftsmanship and consistent performance, Busch® burs and twist drills help reduce errors, protect valuable materials, and elevate the quality of your work.
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Features
Tungsten Vanadium Steel: Engineered for exceptional strength, durability, and long-lasting sharpness to withstand rigorous use.
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Uniform Precision Flutes: Precisely machined flutes ensure smooth, accurate cutting with minimal vibration or chatter, delivering clean holes.
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Optimal Size & Shape: 1.40mm diameter, Fig. 77 twist drill shape designed for detailed jewelry and metalwork applications.
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Standard Shank Size: 3/32” (2.35mm) diameter with approximately 1.75” (44.5mm) length, compatible with most rotary tools including Dremel®, flex shafts, and micromotors.
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Wide Speed Range: Recommended operating speeds between 1,400 - 10,000 rpm provide flexibility for different materials and precision tasks.
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Made in Germany: Crafted with premium-quality German engineering for superior performance and consistent results.
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Pack of 6: Convenient multi-pack ensures you have replacements ready for professional or hobbyist use.
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Versatile Applications: Ideal for drilling metals, gemstones, ceramics, plastics, and other hard materials requiring precision.
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Smooth Cutting Performance: Reduces material damage and heat build-up, extending tool life and protecting delicate workpieces.
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Compatible with Lubricants: Works effectively with cutting lubricants like Busch Lube-Stik to optimize performance and durability.
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Long-Lasting Edge: The tungsten vanadium composition retains sharpness even during intensive use, minimizing frequent tool changes.
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Ideal for Fine Detail Work: Perfect for jewelers, watchmakers, and artisans needing high accuracy and control on small-scale projects.
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