US No. 558 Busch Carbide Straight Fissure (Cylinder) Bur | Busch No. 31 012 – Crosscut – HP | Pack of 6
The carbide cylinder flat dental bur from Busch & Co. GmbH is a precision-engineered rotary cutting instrument designed for demanding dental and technical applications. Manufactured to exacting German standards, this cutter delivers consistent, controlled material removal across a wide range of substrates.
This is a US No. 558. See all 6 Busch versions — materials, shanks, cuts and packs — on our US No. 558 page.
Product Details
This instrument is classified as a Carbide Cutter, Cylinder Flat, conforming to the following standard classification: ISO: 500 104 107 007 012. It is supplied in a convenient pack of 6 (product reference: 31 012 / US No. 558), ensuring you always have a ready supply of fresh cutting instruments on hand.
Applications
The carbide cylinder flat 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. |
Why Choose This Bur?
As a genuine carbide cylinder flat dental bur, this instrument offers superior hardness and edge retention compared to standard steel cutters. The cylinder flat geometry provides flat-bottomed cuts and well-defined margins, making it an ideal choice for technicians who demand accuracy and repeatability in every procedure.
Produced in Germany, each bur in this pack benefits from rigorous quality control and consistent manufacturing tolerances, ensuring reliable performance across all six pieces.
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.
Specifications: Busch No. 31 012
| Busch figure | 31 |
| US No. | 558 |
| Shape | Straight Fissure (Cylinder) |
| ISO size / head diameter | 012 (1.2 mm max head Ø) |
| Cut type / toothing | Crosscut |
| 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. The crosscut pattern gives fast, cool material removal; follow with a fine cut for the final surface. The 1.2 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
Busch Warranty & 60-Day Returns
This Busch instrument is guaranteed against manufacturing and workmanship defects — we'll repair or replace it under normal professional use. Unused, unopened product in its original packaging can also be returned or exchanged within 60 days of delivery. Full terms are on our Warranty page and Returns page.
FAQ
What is the ISO classification for this bur?
The ISO classification is 500 104 107 007 012.
How many burs are included in one pack?
Each pack contains 6 carbide cylinder flat dental burs.
What industries is this bur suitable for?
It is suitable for model making, plastics technology, crown and bridge technology, and model casting technique.
Is this product made in Germany?
Yes, this instrument is manufactured in Germany by Busch & Co. GmbH.
Compare With
| Manufacturer | Reference |
|---|---|
| Komet (Gebr. Brasseler) | H31.104.012 |
| Brasseler USA | H31.11.012 |
| Meisinger | HM31-012-HP |
| SS White | 310067 |
| NTI (Kerr Rotary) | HP558-KC5 |
| Edenta | C31.104.012 |
