US No. 56 Busch Carbide Straight Fissure (Cylinder) Bur | Busch No. 21 009 – HP | Pack of 6
The carbide cylinder flat cutter bur from Busch & Co. GmbH is a precision-engineered rotary cutting instrument designed for demanding material removal and shaping tasks across multiple disciplines. Identified as item 21 009 (US No. 56), this cylinder flat carbide cutter meets the ISO standard classification 500 104 107 006 009, ensuring consistent geometry and performance.
Product Overview
This carbide cylinder flat cutter bur features a flat-ended cylindrical cutting head manufactured from high-grade carbide. The carbide construction delivers exceptional hardness and wear resistance, making it suitable for precise, controlled cutting and finishing operations. Each pack contains 6 burs, providing reliable supply for both laboratory and clinical workflows.
Applications
The carbide cylinder flat cutter bur is well-suited for the following dental laboratory applications:
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Crown and Bridge Technology — Shaping, trimming and finishing of crown and bridge frameworks in the laboratory. |
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Plastics Technology — Shaping, trimming and finishing of acrylic dentures and appliances. |
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Model Making — Trimming and detailing of plaster and stone models. |
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Model Casting Technique — Finishing and adjustment of cast metal frameworks. |
Key Features
- ISO Classification: 500 104 107 006 009
- Cylinder flat geometry for defined, flat-bottom cuts
- High-grade carbide construction for durability and longevity
- Pack of 6 for uninterrupted workflow
- Made in Germany to exacting quality standards
As a trusted carbide cylinder flat cutter bur, this instrument reflects Busch & Co. GmbH's long-standing commitment to precision and quality manufacturing. Whether used in dental laboratory, model-making, or plastics applications, the carbide cylinder flat cutter bur delivers consistent cutting performance backed by German engineering.
Instrument Dimensions
| Head Ø | 0.9 mm (ISO size 009) |
|---|---|
| Shank | HP (Straight Handpiece) — 2.35 mm Ø, 44.5 mm overall length (ISO 104) |
Per ISO 6360, the size number is the maximum head diameter in tenths of a millimeter. See our Busch Bur Size Chart for the full size conversion table, shank codes, and color ring guide.
Busch Warranty & 90-Day Returns
This Busch instrument is guaranteed against manufacturing and workmanship defects — we'll repair or replace it under normal professional use. Unused product in original packaging can also be returned or exchanged within 90 days of your invoice date. Full terms are on our Warranty page.
FAQ
What handpieces are compatible with this instrument? It has an HP (2.35 mm straight) shank, which fits standard laboratory and slow-speed straight handpieces.
How many are included per pack? Each pack contains 6 burs.
Where is this instrument made? It is manufactured by Busch & Co. in Engelskirchen, Germany, an ISO 13485-certified specialist in rotary precision instruments since 1905.
Compare With
| Manufacturer | Reference |
|---|---|
| Komet (Gebr. Brasseler) | H21.104.009 |
| Brasseler USA | H21.11.009 |
| Meisinger | HM21-009-HP |
| Edenta | C21.104.009 |
Manufacturer literature: Busch catalogs and product brochures for this line are available in our Busch Burs Catalog Library.
Specifications: Busch No. 21 009
| Busch figure | 21 |
| US No. | 56 |
| Shape | Straight Fissure (Cylinder) |
| ISO size / head diameter | 009 (0.9 mm max head Ø) |
| Shank | HP (2.35 mm) |
| Lab applications (per Busch) | Crown and Bridge Technology, Model Casting Technique, Model Making, Plastics Technology |
| Pack size | Pack of 6 |
| Material | Carbide |
The straight fissure (cylinder) head has parallel sides and a flat end, so it cuts straight-walled slots, flat steps and parallel surfaces. The 0.9 mm head is a small size for confined spaces and detail work.
Read the guides: Dental Laboratory Burs, Polishers & Abrasives · Bur Speed Chart · Dental Bur Glossary · All lab carbide cutters
This is a US No. 56. See all 2 Busch versions — materials, shanks, cuts and packs — on our US No. 56 page.
US No. 56 Busch Carbide Straight Fissure (Cylinder) Bur | Busch No....
