US No. 58L Busch Carbide Straight Fissure (Cylinder) Long Bur | Busch No. 21L 012 – HP | Pack of 6
The carbide cylinder flat cutter dental bur from Busch & Co. GmbH is a precision-engineered rotary instrument designed for demanding applications in dental and technical laboratories. Manufactured in Germany, this cutter delivers the consistent performance and dimensional accuracy that professionals expect from a premium-grade tool.
Product Details
This instrument is classified as a Carbide Cutter, Cylinder Flat, conforming to the standard ISO classification 500 104 110 006 012 (US No. 58L). It is supplied in a convenient pack of 6, ensuring availability for continuous workflow without frequent reordering. The long shank HP (handpiece) configuration provides extended reach and enhanced control in precision cutting tasks.
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 | 1.2 mm (ISO size 012) |
|---|---|
| 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 Cutter?
As a carbide cylinder flat cutter dental bur, this instrument features a flat-ended cylindrical geometry that enables smooth, controlled material removal in both dental and technical lab settings. The carbide construction ensures long-lasting sharpness and resistance to wear under repeated use. Each unit is made in Germany to rigorous quality standards.
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? This carbide cylinder flat cutter dental bur is classified under ISO 500 104 110 006 012.
How many burs are included per pack? Each pack contains 6 individual burs, making it cost-effective for laboratory and clinical use.
What shank type does this bur use? It features an HP (handpiece) shank in a long configuration, referenced as US No. 58L.
Compare With
| Manufacturer | Reference |
|---|---|
| Komet (Gebr. Brasseler) | H21L.104.012 |
| Brasseler USA | H21L.11.012 |
| Edenta | C21L.104.012 |
Manufacturer literature: Busch catalogs and product brochures for this line are available in our Busch Burs Catalog Library.
Specifications: Busch No. 21L 012
| Busch figure | 21L |
| US No. | 58L |
| Shape | Straight Fissure (Cylinder) Long |
| ISO size / head diameter | 012 (1.2 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 long straight fissure head keeps the parallel-sided cylinder profile but reaches deeper, for slots and walls that a standard-length head cannot follow. At 1.2 mm the head is small, suited to interdental areas, clasp spaces and fine detail rather than bulk work.
Read the guides: Dental Laboratory Burs, Polishers & Abrasives · Bur Speed Chart · Dental Bur Glossary · All lab carbide cutters
This is a US No. 58. See all 5 Busch versions — materials, shanks, cuts and packs — on our US No. 58 page.
US No. 58L Busch Carbide Straight Fissure (Cylinder) Long Bur | Bus...
