Machine Comparison
Haas ST-15Y vs Haas ST-25Y
Haas Automation vs Haas Automation · CNC Lathes
Summary
The Haas ST-15Y and Haas ST-25Y 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-15Y leads in max spindle speed (4,000 RPM vs 3,400 RPM). The Haas ST-25Y leads in spindle power (22.4 kW (30 hp) vs 14.9 kW (20 hp)). The Haas ST-25Y leads in chuck size (254 mm (10 in) vs 210 mm (8.3 in)). The Haas ST-25Y shows specification advantages in 10 categories, though the Haas ST-15Y 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-15Y | Haas ST-25Y |
|---|---|---|
| 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 stations | 12-station BMT-65 turret |
| Chuck Size | 210 mm (8.3 in) | 254 mm (10 in) ▲ |
| Bar Capacity | 64 mm (2.5 in) | 76 mm (3.0 in) ▲ |
| Control | Haas Next Generation Control (NGC) | Haas Next Generation Control (NGC) |
| Max Cutting Diameter | 279 mm (11 in) with BMT45 turret | 349 mm (13.75 in) ▲ |
| Max Cutting Length | 406 mm (16 in) | 584 mm (23 in) ▲ |
| Spindle Nose | A2-6 | A2-6 |
| Spindle Bore | 88.9 mm (3.5 in) | 89 mm (3.5 in) |
| X Axis Travel | 200 mm (7.88 in) | 318 mm (12.5 in) ▲ |
| Y Axis Travel | +/- 51 mm (2.0 in) | 102 mm (4.0 in) total / ±50.8 mm (±2.0 in) ▲ |
| Z Axis Travel | 406 mm (16 in) | 584 mm (23 in) ▲ |
| Price Range | $108,995 - $165,000 | $105,000 - $130,000 ▲ |
Advantages
Haas ST-15Y
- 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
- Medical device manufacturers producing bone screws, implant components, surgical instruments, and precision fittings in a single setup
Haas ST-25Y
- 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 (3.0 in) vs 64 mm (2.5 in)
- Superior max cutting diameter at 349 mm (13.75 in) vs 279 mm (11 in) with BMT45 turret
Verdict
The Haas ST-25Y edges ahead on specifications in this comparison, particularly in Spindle Power and Spindle Torque. However, the Haas ST-15Y 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.