US No. 558L Busch Carbide Straight Fissure (Cylinder) Long Bur | Busch No. 31L 012 – Crosscut – HP | Pack of 6
The carbide cylinder flat cutter dental bur from Busch & Co. GmbH is a precision-engineered rotary cutting instrument designed for demanding professional applications. Manufactured in Germany, 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 type, conforming to the following standard classification: ISO: 500 104 110 007 012. The HP (handpiece) shank configuration and long carbide cylinder flat geometry make this carbide cylinder flat cutter dental bur a versatile choice for technicians who require reliable performance in precision work environments. Each pack contains 6 burs.
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. |
Why Choose This Bur?
As a genuine carbide cylinder flat cutter dental bur made in Germany, this instrument reflects Busch's long-standing commitment to quality, precision, and engineering excellence. The carbide construction ensures lasting sharpness and durability under repeated use, making it a dependable choice for laboratory and clinical professionals alike.
Whether you are working in dental technology, model making, or plastics fabrication, this carbide cylinder flat cutter dental bur offers the performance and consistency required for exacting work. Supplied in a convenient pack of 6 for uninterrupted workflow.
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. 31L 012
| Busch figure | 31L |
| US No. | 558L |
| Shape | Straight Fissure (Cylinder) Long |
| ISO size / head diameter | 012 (1.2 mm max head Ø) |
| Cut type / toothing | Crosscut |
| Shank | HP (2.35 mm) |
| 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. A 1.2 mm head works in narrow interdental and clasp areas where a larger head cannot reach. Its crosscut (double-cut) toothing removes stock quickly and clears chips well, so it is a shaping rather than a finishing cutter.
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 handpieces are compatible with this instrument?
It has an HP (2.35 mm straight) shank, which fits standard laboratory and slow-speed straight handpieces.
How many are included per pack?
Each pack contains 6 burs.
Where is this instrument made?
It is manufactured by Busch & Co. in Engelskirchen, Germany, an ISO 13485-certified specialist in rotary precision instruments since 1905.
Compare With
| Manufacturer | Reference |
|---|---|
| Komet (Gebr. Brasseler) | H31L.104.012 |
| Brasseler USA | H31L.11.012 |
| SS White | 310084 |
| Edenta | C31L.104.012 |
