US No. 58 Busch Carbide Straight Fissure (Cylinder) Bur | Busch No. 21 012 – HP | Pack of 6

The carbide cylinder flat dental bur from Busch & Co. GmbH is a precision-engineered rotary cutting instrument designed for demanding applications across dental and technical disciplines. Featuring a flat-ended cylinder geometry, this high-performance carbide cutter delivers clean, controlled material removal with consistent results.

Product Details

This instrument is classified under ISO: 500 104 107 006 012 (US No. 58) and is supplied as a pack of 6, ensuring you always have a reliable supply on hand. The HP (handpiece) shank is compatible with standard straight handpiece connections, making integration into existing setups straightforward.

As a carbide cylinder flat dental bur, this cutter is engineered for precise flat-surface work and right-angle wall preparation. Carbide construction provides exceptional hardness and longevity compared to standard steel alternatives, reducing the frequency of replacements and maintaining cutting efficiency throughout the tool's working life.

Applications

The carbide cylinder flat dental bur is well-suited for the following dental laboratory applications:

	Crown and Bridge Technology — Shaping, trimming and finishing of crown and bridge frameworks in the laboratory.
	Plastics Technology — Shaping, trimming and finishing of acrylic dentures and appliances.
	Model Making — Trimming and detailing of plaster and stone models.
	Model Casting Technique — Finishing and adjustment of cast metal frameworks.

Instrument Dimensions

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.

German Engineering Quality

Manufactured by Busch & Co. GmbH, this carbide cylinder flat dental bur upholds the exacting standards associated with German-made dental instruments. Each bur is produced with strict quality control to deliver repeatable performance across clinical and technical workflows.

FAQ

What is the ISO classification for this bur? This bur is classified under ISO: 500 104 107 006 012.

How many burs are included in one pack? Each pack contains 6 individual burs.

What shank type does this bur use? This bur features an HP (handpiece) straight shank for use with standard straight handpieces.

Compare With

Manufacturer literature: Busch catalogs and product brochures for this line are available in our Busch Burs Catalog Library.