US No. 55 Busch Carbide Straight Fissure (Cylinder) Bur | Busch No. 21 008 – HP | Pack of 6
The carbide cylinder flat cutter dental bur (Busch 21 008, US No. 55) is a precision-engineered rotary instrument designed for controlled material removal across a range of professional applications. Manufactured in Germany by Busch & Co. GmbH, this HP (Handpiece) shank carbide cutter delivers consistent cutting performance and long-lasting durability in demanding work environments.
Product Details
This carbide cylinder flat cutter dental bur features a cylinder flat geometry, making it well suited for flat-bottomed preparations and precise lateral cutting. The ISO classification for this instrument is 500 104 107 006 008, ensuring compatibility and standardization across professional settings. Each pack contains 6 burs, providing excellent value for high-volume use.
Applications
The carbide cylinder flat cutter dental 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. |
Instrument Dimensions
| Head Ø | 0.8 mm (ISO size 008) |
|---|---|
| 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.
Why Choose This Carbide Bur
As a carbide cylinder flat cutter dental bur, the Busch 21 008 is crafted to exacting German engineering standards, ensuring reliable cutting geometry, superior surface finish, and extended tool life. The carbide construction provides excellent hardness and wear resistance, reducing the need for frequent replacement.
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 is the ISO classification for this bur? The ISO classification is 500 104 107 006 008.
How many burs are included per pack? Each pack contains 6 burs.
What shank type does this bur use? This bur uses an HP (Handpiece) shank, suitable for straight handpiece use.
Is this a genuine Busch product made in Germany? Yes, this carbide cylinder flat cutter dental bur is manufactured by Busch & Co. GmbH in Germany to professional-grade standards.
Compare With
| Manufacturer | Reference |
|---|---|
| Komet (Gebr. Brasseler) | H21.104.008 |
| Brasseler USA | H21.11.008 |
| Meisinger | HM21-008-HP |
| Edenta | C21.104.008 |
Manufacturer literature: Busch catalogs and product brochures for this line are available in our Busch Burs Catalog Library.
Specifications: Busch No. 21 008
| Busch figure | 21 |
| US No. | 55 |
| Shape | Straight Fissure (Cylinder) |
| ISO size / head diameter | 008 (0.8 mm max head Ø) |
| Shank | HP |
| 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. A 0.8 mm head works in narrow interdental and clasp areas where a larger head cannot reach.
Read the guides: Dental Laboratory Burs, Polishers & Abrasives · Bur Speed Chart · Dental Bur Glossary · All lab carbide cutters
This is a US No. 55. See all 2 Busch versions — materials, shanks, cuts and packs — on our US No. 55 page.
US No. 55 Busch Carbide Straight Fissure (Cylinder) Bur | Busch No....
