Machine Comparison
Haas ST-20Y vs Haas ST-25
Haas Automation vs Haas Automation · CNC Lathes
Summary
The Haas ST-20Y and Haas ST-25 are both from Haas Automation's cnc lathes lineup, making this a common upgrade or lineup decision for shops already invested in the Haas Automation ecosystem. The Haas ST-20Y leads in max spindle speed (4,000 RPM vs 3,400 RPM). The Haas ST-25 leads in spindle power (22.4 kW (30 hp) vs 14.9 kW (20 hp)). The Haas ST-25 leads in chuck size (254 mm (10 in) vs 210 mm (8.3 in)). The Haas ST-25 shows specification advantages in 6 categories, though the Haas ST-20Y may still be the better choice depending on your shop's specific needs and the type of work you run. Both machines are proven performers in production environments and represent solid investments for shops in the market for a cnc lathe.
Specifications Comparison
| Specification | Haas ST-20Y | Haas ST-25 |
|---|---|---|
| Max Spindle Speed | 4,000 RPM ▲ | 3,400 RPM |
| Spindle Power | 14.9 kW (20 hp) | 22.4 kW (30 hp) ▲ |
| Spindle Torque | 203 Nm (150 ft-lb) @ 500 RPM | 407 Nm (300 ft-lb) @ 500 RPM ▲ |
| Tool Capacity | 12-station BMT-65 | 12-station BOT |
| Chuck Size | 210 mm (8.3 in) | 254 mm (10 in) ▲ |
| Bar Capacity | 63.5 mm (2.5 in) | 76 mm (3 in) ▲ |
| Control | Haas Next Generation Control (NGC) | Haas Next Generation Control (NGC) |
| Max Swing | 533 mm (21 in) | 533 mm (21 in) |
| Max Cutting Diameter | 298 mm (11.75 in) | 330 mm (13 in) ▲ |
| Max Cutting Length | 572 mm (22.5 in) | 572 mm (22.5 in) |
| Spindle Nose | A2-6 | A2-6 |
| Spindle Bore | 88.9 mm (3.5 in) | 88.9 mm (3.5 in) |
| X Axis Travel | 213 mm (8.4 in) | 213 mm (8.4 in) |
| Z Axis Travel | 572 mm (22.5 in) | 572 mm (22.5 in) |
| Price Range | $80,000 - $110,000 | $60,000 - $90,000 ▲ |
Advantages
Haas ST-20Y
- Higher maximum spindle speed of 4,000 RPM enables faster cutting on aluminum and non-ferrous materials
- Backed by Haas Automation's dealer and service network for parts and support
- Job shops adding Y-axis turning capability without a six-figure machine investment
Haas ST-25
- More spindle power at 22.4 kW (30 hp) for aggressive material removal in harder materials
- Superior spindle torque at 407 Nm (300 ft-lb) @ 500 RPM vs 203 Nm (150 ft-lb) @ 500 RPM
- Superior chuck size at 254 mm (10 in) vs 210 mm (8.3 in)
- Superior bar capacity at 76 mm (3 in) vs 63.5 mm (2.5 in)
- Superior max cutting diameter at 330 mm (13 in) vs 298 mm (11.75 in)
Verdict
The Haas ST-25 edges ahead on specifications in this comparison, particularly in Spindle Power and Spindle Torque. However, the Haas ST-20Y remains competitive and may be the better choice depending on price, dealer support in your area, or specific workholding and tooling considerations. Both are capable machines — the best decision comes from running your actual parts and evaluating total cost of ownership including tooling, training, and service.