US No. 555 Bur – Busch Straight Fissure Carbide & Steel, Made in Germany
The US No. 555 is the American number for a straight fissure bur with a 0.8 mm head (ISO size 008): 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. 31 008 and Busch No. 36 008. Every US No. 555 on this page is a genuine Busch instrument and ships from our US warehouse.
Busch & Co. GmbH
Regular price $36.99Unit price-
Busch & Co. GmbH
Regular price $36.99Unit price -
Busch & Co. GmbH
Regular price $19.99Unit price
Reference pages already linked from this collection, in one place.
Which US No. 555 Do You Need?
Choose by shank first, then by material; every active product in the collection is linked once below by its Busch number.
FG (high-speed handpiece)1 items
| Busch No. | US No. | Material | Cut | Shank | Best for | Pack |
|---|---|---|---|---|---|---|
| 31 008 | 555 | Carbide | Crosscut | FG | High-speed handpiece | 6 |
HP (straight handpiece)2 items
FG (friction grip, 1.6 mm shank, high-speed handpiece). HP (2.35 mm shank, straight handpiece). See the Busch Bur Size Chart for head and shank dimensions.
Speed and Technique
Run the FG versions in the high-speed handpiece with continuous water spray and light, intermittent pressure; let the blades do the work. HP versions run at laboratory speed in the straight handpiece. 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
- Cavity preparation: opening through enamel and establishing the straight walls and flat floor of Class I and Class II preparations, including proximal boxes.
- Restoration removal: cutting out old amalgam and composite; crosscut versions clear the debris instead of packing with it.
- Sectioning: dividing crowns and multi-rooted teeth.
- Laboratory and denture work: the HP carbide and steel versions trim acrylic, adjust denture bases and reduce plaster models in the straight handpiece.
At 0.8 mm the No. 555 is a fine head for narrow fissures and conservative preparations.
The No. 555 is crosscut; its plain-cut twin in the same shape and size is the US No. 55 (Busch 21 008). Crosscut blades cut faster and clear debris; when you need a smooth wall or a finish line, follow with the plain-cut twin or a finishing bur.
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. 55 Bur (plain-cut), Straight Fissure (Cylinder) Burs, Double Cut Burs: Busch Crosscut Carbide Cutters, Tapered Fissure (Cone) Burs, and HP Burs for the Straight Handpiece. For bur numbering and dimensions, see the Busch Bur Size Chart and the Dental Bur Color Coding & ISO Guide.
Related resources: US Bur Number Finder · Bur Comparison Chart · Speed Chart · Bur Glossary · Nearby sizes: US No. 556, US No. 557
FAQ
What is the Busch number for a US 555 bur?
Busch No. 31 008 in carbide (FG/HP); Busch No. 36 008 in steel (HP).
What size is a No. 555 bur?
The No. 555 has a 0.8 mm head diameter (ISO size 008) on a straight fissure bur head, ISO shape 107 (cylinder, flat end).
What is the difference between a No. 555 and a No. 55?
Same shape and size; one is plain-cut and the other crosscut. The No. 555 is crosscut — crosscut cuts faster and clears debris, plain-cut leaves a smoother surface.
Carbide or steel?
Tungsten carbide for enamel, dentin, composite and amalgam in the clinic; the steel No. 555 is the economical choice for acrylics, plaster and other soft materials in the laboratory.
Are Busch No. 555 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.
