US No. 20 Bur – Busch Round Steel, Made in Germany
The US No. 20 is the American number for a round bur with a 5 mm head (ISO size 050): a spherical head that cuts on every surface, so it excavates, opens and shapes in any direction. Busch & Co. manufactures it in Germany as Busch No. 1 050. Every US No. 20 on this page is a genuine Busch instrument and ships from our US warehouse.
Busch & Co. GmbH
US No. 20 Busch Steel Round Bur | Busch No. 1 050 – HP | Pack of 6
Regular price $29.99Unit price
Reference pages already linked from this collection, in one place.
Which US No. 20 Do You Need?
The collection currently holds one US No. 20, linked below by its Busch number.
HP (straight handpiece)1 items
| Busch No. | US No. | Material | Cut | Shank | Best for | Pack |
|---|---|---|---|---|---|---|
| 1 050 | 20 | Steel | Plain-cut | HP | Economical laboratory cutting of acrylics and plaster | 6 |
HP (2.35 mm shank, straight handpiece). See the Busch Bur Size Chart for head and shank dimensions.
Speed and Technique
The No. 20 on this page has an HP shank: run it at laboratory speed in the straight handpiece with a light touch. Maximum recommended speeds for every Busch shape are in our Dental Bur Speed Chart, and reprocessing steps in the Bur Sterilization Guide.
Made in Germany by Busch & Co.
Busch & Co. has manufactured rotary instruments in Engelskirchen, Germany since 1905. Every instrument on this page is a genuine Busch product, precision-ground on a concentric shank under ISO 13485-certified quality management and covered by our Busch warranty.
Clinical Use
- Laboratory reduction: the HP steel No. 20 hollows out, relieves and adjusts acrylic, plaster and wax in the straight handpiece.
- Rounded shaping: the spherical head cuts in every direction, leaving rounded internal forms and relief areas.
At 5 mm the No. 20 is a large head for prosthetic and laboratory reduction.
Care and Reconditioning
Busch steel burs are reusable: clean, disinfect and sterilize them between patients following the manufacturer instructions and replace them once they dull. Our Dental Bur Reprocessing & Sterilization Guide gives the steps for Busch rotary instruments.
Compare With
Related Busch collections: US No. 11 Bur, US No. 19 Bur, Round Burs, and Dental Lab Steel Burs. For bur numbering and dimensions, see the Busch Bur Size Chart and the Dental Bur Glossary.
Related resources: US Bur Number Finder · Bur Comparison Chart · Speed Chart · Bur Glossary · Nearby sizes: US No. 11, US No. 19
FAQ
What is the Busch number for a US 20 bur?
Busch No. 1 050 in steel (HP).
What size is a No. 20 bur?
The No. 20 has a 5 mm head diameter (ISO size 050) on a round bur head, ISO shape 001 (ball).
Are Busch No. 20 burs reusable?
Yes. Steel burs are cleaned, disinfected and sterilized between patients and replaced when they dull; the Bur Sterilization Guide gives the validated steps.
