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Busch Burr 77A Pearl Drill 2.30mm – a top choice for professional jewelers, delivers precision and quality to prevent chipping and create smooth holes in delicate materials like pearls.
Established in 1905, Busch® is a world leader in high-precision rotary instruments, known for crafting durable, reliable burs trusted by generations of jewelers and gem setters.
These Busch® Pearl Drill Burs feature a smooth flat cutting head and a 2.30mm diameter, precision-engineered from premium hardened tungsten vanadium steel. This material ensures long-lasting performance, excellent wear resistance, and smooth, chip-free results when working with pearls, beads, or other soft gemstones.
Each bur offers a 4.2mm working head depth, allowing for both initial hole creation and the safe enlargement of pre-existing holes without damaging the pearl’s nacre or structure. The tapered 2.34mm shank fits securely in most standard jewelry rotary tools, including pendant drills, micromotors, flex shafts, and pin vices.
Ideal for low-speed operation, these burs deliver optimal results when paired with cooling methods such as underwater drilling or the use of Busch Lube-Stik lubricant, helping reduce heat buildup and prolong tool life.
- Brand: Busch®
- Type: Pearl Drill Bur
- Model: 77A Pearl Drill
- ISO Number: #023
- Shank Diameter: 3/32" (2.34mm) tapered, fits most rotary collets
- Head Size: 2.30mm diameter, 4.2mm working depth
- Material: High-quality tungsten vanadium steel
- Application: Jewelry making, pearl drilling, bead drilling, gemstone detailing, precision engraving on soft materials
About this Item:
The Busch® 77A Pearl Drill Bur (2.30mm, ISO #023) is engineered for professionals who demand accuracy, durability, and smooth performance when working with delicate materials like pearls, beads, and soft gemstones.
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Made in Germany, these burs are crafted from premium-grade tungsten vanadium steel, offering excellent durability, heat resistance, and long tool life.
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The flat drilling head design ensures a controlled entry point and helps prevent chipping or cracking of the nacre.
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Optimized for low-speed drilling, these burs deliver consistently clean, round holes without tearing or flaking delicate surfaces.
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Ideal for enlarging existing holes or creating new ones in round materials like pearls, where conventional burs may slip or cause damage.
How to Use:
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Secure the pearl using a pearl vise or soft clamp.
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Drill under water or use a suitable lubricant (like Busch® Lube-Stik) to minimize heat and preserve both the tool and the workpiece.
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Insert the bur into compatible tools like flex shafts, Dremels, pendant drills, micromotors, or pin vices.
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Apply light, even pressure to avoid breakage or overheating.
Care & Maintenance:
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Rinse and dry thoroughly after each use to remove debris and moisture.
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Store in a dry, padded case to prevent oxidation or wear.
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Inspect for wear regularly and replace if teeth show signs of dulling.
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Features
2.30mm Precision Drill Head: Ideal size for enlarging or creating clean, uniform holes in pearls, beads, and other soft materials without cracking or splitting.
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Fine Flat-End Design: Specifically engineered to reduce chipping and minimize pressure on delicate surfaces like nacre or glass beads, offering excellent control.
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Premium Tungsten Vanadium Steel Construction: Delivers superior hardness, sharpness retention, and resistance to wear or deformation during extended use.
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4.2mm Working Head Depth: Provides consistent drilling depth, helping jewelers achieve accurate and repeatable results across multiple pieces.
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Low-Speed Optimized: Performs best at slower RPMs, reducing friction and heat generation—perfect for delicate materials that are heat-sensitive.
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Versatile Tool Compatibility: Fits standard 3/32" (2.34mm) collets and handpieces—use with pendant drills, micromotors, flex shafts, and pin vices.
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Multi-Application Use: Ideal not only for pearl drilling but also for use on shell, amber, resin beads, plastic, or even for pilot holes in fine woodworking or model-making.
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Smooth Cutting Action: Fine-tooth cut geometry ensures chatter-free operation, reducing surface damage and producing professional-grade finishes.
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Trusted by Professionals: A favorite among gem setters, goldsmiths, and high-end jewelry workshops worldwide for its reliability and precision.
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Made in Germany by Busch®: Over a century of engineering excellence, quality-controlled to meet the highest industry standards for jewelry tools.
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