US No. 63 Bur – Busch Straight Fissure Carbide, Made in Germany
The US No. 63 is the American number for a straight fissure bur with a 2.3 mm head (ISO size 023): a parallel-sided cylinder with a flat end, so it cuts straight walls and a flat floor in one motion. Busch & Co. manufactures it in Germany as Busch No. 21 023. Every US No. 63 on this page is a genuine Busch instrument and ships from our US warehouse.
Busch & Co. GmbH
US No. 63 Busch Carbide Straight Fissure (Cylinder) Bur | Busch No. 21 023 – HP | Pack of 6
Regular price $36.99Unit price
Reference pages already linked from this collection, in one place.
Which US No. 63 Do You Need?
The No. 63 in this collection is the carbide HP version, linked below by its Busch number.
HP (straight handpiece)1 items
| Busch No. | US No. | Material | Cut | Shank | Best for | Pack |
|---|---|---|---|---|---|---|
| 21 023 | 63 | Carbide | Plain-cut | HP | Straight handpiece: laboratory and denture work | 6 |
HP (2.35 mm shank, straight handpiece). See the Busch Bur Size Chart for head and shank dimensions.
Speed and Technique
Run these HP burs at laboratory speed in the straight handpiece with light, intermittent pressure; let the blades do the work. 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 and denture work: the HP carbide version trims acrylic, adjusts denture bases and reduces plaster models in the straight handpiece.
- Straight-walled cuts: the flat-end cylinder cuts straight-walled slots, channels and flat seats in acrylic, wax and model materials.
At 2.3 mm the No. 63 is a wide head for bulk reduction and laboratory cutting.
The No. 63 is plain-cut; its crosscut twin in the same shape and size is the US No. 563 (Busch 31 023). Crosscut blades cut faster and clear debris; plain-cut blades leave a smoother wall.
Care and Reconditioning
Busch carbide and 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. 563 Bur (crosscut), US No. 62 Bur, US No. 564 Bur, Straight Fissure (Cylinder) Burs, HP Burs for the Straight Handpiece, and Dental Lab Carbide 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. 61, US No. 62
FAQ
What is the Busch number for a US 63 bur?
Busch No. 21 023 in carbide (HP).
What size is a No. 63 bur?
The No. 63 has a 2.3 mm head diameter (ISO size 023) on a straight fissure bur head, ISO shape 107 (cylinder, flat end).
What is the difference between a No. 63 and a No. 563?
Same shape and size; one is plain-cut and the other crosscut. The No. 63 is plain-cut — crosscut cuts faster and clears debris, plain-cut leaves a smoother surface.
Are Busch No. 63 burs reusable?
Yes. Carbide and steel burs are cleaned, disinfected and sterilized between patients and replaced when they dull; the Bur Sterilization Guide gives the validated steps.
