When manufacturers need expanding capability closer to production, they need more than raw force. They need a machine that is practical to use, reliable in operation and built to support consistent results.
That’s the thinking behind the new Grotnes BET-01 Expander.
Starting at 20 tons, the BET-01 is the first in a new series of value-oriented expanders designed as a portable, point-of-use machine that can be moved and positioned on the production line where it fits best. Built on legendary Grotnes Expander technology, the BET-01 gives customers a strong mechanical foundation along with the control needed for everyday production work.
Grotnes Expanding Technology with Point-of-Use Flexibility

The BET-01 is designed for customers who need practical expanding capability without unnecessary complexity. It combines proven Grotnes engineering with a straightforward operating approach.
The machine uses a hardened alloy steel cone and a set of steel jaws arranged evenly around the center of the expander. As the hydraulic cylinder retracts, the cone moves in relation to the jaws, driving them outward in a uniform motion. That expanding action applies force evenly around the part, permanently increasing diameter while supporting improved roundness and repeatability.
In simpler terms, the BET-01 is built to expand ring-shaped parts with controlled, even outward force. That matters as customers look for accuracy, consistency and confidence in the final result.
What that Means for Your Operation
The BET-01 is designed to give operators and production teams a machine that is easier to apply at the point of use. Because the BET-01 is designed for manual size setpoint, operators have direct control over the sizing process. At the same time, the touchscreen HMI allows users to adjust pressures, speeds and dwell for each part being sized, helping customers strike a balance between hands-on control and process flexibility.
BET-01 Specifications
The BET-01 is offered with the following typical specifications:
- Starting tonnage: 20 tons
- 8 jaws
- 4.25-inch high jaws
- 0.520-inch nominal diametral travel
- 5.00-inch nominal expanded diameter
- 4.51-inch jaw collapsed diameter
- 36-inch table diameter
- 2425 psi operating pressure
Backed by Grotnes Experience
Grotnes has long been known for our expertise in expanding technology, and that experience matters when customers are evaluating where reliability comes from. The BET-01 reflects our background while introducing a more value-oriented option for customers who need a practical, point-of-use machine.
That combination is what makes the BET-01 notable. It’s Grotnes know-how applied to a machine designed around a clear use case and recurring customer need.
Let’s Talk About Your Application
If you’re evaluating expanding equipment for a point-of-use application, we can help you determine whether the BET-01 is the right match for your operation.
Contact Grotnes to discuss your application and learn more about the new BET-01 Expander.
