US No. 321 Mandrel – Busch Stainless Steel Mandrel, Made in Germany
The US No. 321 is the American number for a mandrel with a 5 mm head (ISO size 050): a stainless steel carrier that mounts abrasive and polishing discs in the handpiece. Busch & Co. manufactures it in Germany as Busch No. 305RS 050. Every US No. 321 on this page is a genuine Busch instrument and ships from our US warehouse.
Busch & Co. GmbH
US No. 321 Busch Stainless Steel Mandrel | Busch No. 305RS 050 – HP | Pack of 6
Regular price $22.99Unit price
Reference pages already linked from this collection, in one place.
Which US No. 321 Do You Need?
The collection currently holds one US No. 321, linked below by its Busch number.
HP (straight handpiece)1 items
| Busch No. | US No. | Material | Cut | Shank | Best for | Pack |
|---|---|---|---|---|---|---|
| 305RS 050 | 321 | Stainless Steel | — | 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
Fit only discs designed for the mandrel head, seat them fully, and run at the disc manufacturer’s speed; replace a mandrel whose head no longer holds a disc securely. 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
- Finishing and polishing: carrying abrasive discs for contouring and polishing composite, acrylic and metal.
- Separation: carrying separating discs in the laboratory.
At 5 mm the No. 321 is a head sized for standard dental discs.
Care and Reconditioning
Clean, disinfect and sterilize the mandrel between uses following the manufacturer instructions, and replace it once its head no longer holds a disc securely or it shows damage. Our Dental Bur Reprocessing & Sterilization Guide covers the workflow for Busch rotary instruments.
Compare With
Related Busch collections: US No. 303 Mandrel, Dental Mandrels, Soft Disc 4 Step Polishing Disc System, Dental Laboratory Polishing Soft Buff Wheels, and Wheel & Disc Instruments. For shank and head dimensions, see the Busch Bur Size Chart.
Related resources: US Bur Number Finder · Bur Comparison Chart · Speed Chart · Bur Glossary
FAQ
What is the Busch number for the US 321 mandrel?
Busch No. 305RS 050 in HP.
