US No. 1158 Busch Carbide Straight Fissure (Cylinder) Round Bur | Busch No. 21R 012 – HP | Pack of 6
The carbide cylinder round dental bur 21R 012 (US No. 1158) by Busch & Co. GmbH is a precision-engineered HP (Handpiece) fissure cutter designed for demanding dental and technical applications. Manufactured to ISO standard 500 104 137 006 012, this tool delivers consistent, controlled material removal across a wide range of disciplines.
Product Overview
This carbide cylinder round dental bur features a cylinder round geometry that enables smooth, even cutting strokes. The tungsten carbide construction ensures long-lasting sharpness and resistance to wear, making it a reliable choice for professionals who require repeatable accuracy. Each pack contains 6 burs, providing excellent value for busy practices and technical laboratories.
Applications
The carbide cylinder round 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. |
Key Features
- ISO Classification: 500 104 137 006 012
- US No. 1158 designation for easy cross-referencing
- HP (Handpiece) shank compatibility
- Carbide construction for durability and consistent performance
- Cylinder round form for versatile cutting geometry
- Pack of 6 for cost-effective use
- Made in Germany
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.
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 for the 21R 012 carbide cylinder round dental bur is 500 104 137 006 012.
How many burs are included in one pack? Each pack contains 6 burs.
Is this bur suitable for both dental and technical laboratory use? Yes, the carbide cylinder round dental bur is designed for a variety of applications including model making, plastics technology, crown and bridge work, and model casting.
Where is this product manufactured? This bur is proudly made in Germany by Busch & Co. GmbH, a trusted name in precision dental instrumentation.
Compare With
| Manufacturer | Reference |
|---|---|
| Komet (Gebr. Brasseler) | H21R.104.012 |
Manufacturer literature: Busch catalogs and product brochures for this line are available in our Busch Burs Catalog Library.
Specifications: Busch No. 21R 012
| Busch figure | 21R |
| US No. | 1158 |
| Shape | Straight Fissure (Cylinder) Round |
| 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 | Tungsten carbide |
With parallel sides and a domed end, the straight fissure round head cuts straight walls while leaving a rounded floor, which is kinder to the material than a sharp internal corner. A 1.2 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. 1158. See all 2 Busch versions — materials, shanks, cuts and packs — on our US No. 1158 page.
US No. 1158 Busch Carbide Straight Fissure (Cylinder) Round Bur | B...
