US No. 56 Busch Carbide Straight Fissure (Cylinder) Bur | Busch No. 21 009 – FG | Pack of 6
The carbide cylinder fissure dental bur by Busch & Co. GmbH is a precision-engineered rotary instrument designed for demanding cavity preparation and fissure work in restorative dentistry. Manufactured in Germany to exacting standards, this bur delivers consistent, controlled cutting performance across a wide range of clinical procedures.
Product Details
- Type: Carbide, Cylinder Flat, Excavating and Fissure Bur
- Item Number: 21 009 (US No. 56)
- Shank: FG (Friction Grip)
- ISO Classification: 500 314 107 006 009
- Pack Size: Pack of 6
Applications
The carbide cylinder fissure dental bur is well-suited for the following clinical procedures:
| Cavity/Fissure Preparation — Opening, extending and shaping cavities and fissures with controlled removal of enamel and dentin. |
Instrument Dimensions
| Head Ø | 0.9 mm (ISO size 009) |
|---|---|
| Shank | FG (Friction Grip) — 1.60 mm Ø, 19 mm overall length (ISO 314) |
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 Bur
As a professional-grade carbide cylinder fissure dental bur, this instrument offers the reliability and geometric consistency that clinicians expect from German-engineered dental tooling. The cylinder flat design ensures well-defined cavity floors and walls, supporting accurate preparation for composite, amalgam, or other restorative materials.
Each pack contains 6 burs, providing excellent value for busy dental practices requiring reliable, repeatable performance bur after bur.

FAQ
What shank type does this bur use? This bur features an FG (Friction Grip) shank, compatible with standard high-speed handpieces.
How many burs are included? Each order includes a pack of 6 carbide cylinder fissure dental burs.
What is the ISO classification? The ISO classification for this bur is 500 314 107 006 009.
Compare With
| Manufacturer | Reference |
|---|---|
| Komet (Gebr. Brasseler) | H21.314.009 |
| Brasseler USA | H21.31.009 |
| Meisinger | HM21-009-FG |
| SS White | 310114 |
| NTI (Kerr Rotary) | FG56-KC0 |
| Alpen (Coltène) | R100056 |
Manufacturer literature: Busch catalogs and product brochures for this line are available in our Busch Burs Catalog Library.

