Machine Comparison
Haas ST-15 vs Haas ST-20
Haas Automation vs Haas Automation · CNC Lathes
Summary
The Haas ST-15 and Haas ST-20 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-20 shows specification advantages in 5 categories, though the Haas ST-15 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-15 | Haas ST-20 |
|---|---|---|
| Max Spindle Speed | 4,000 RPM | 4,000 RPM |
| Spindle Power | 14.9 kW (20 hp) | 14.9 kW (20 hp) |
| Spindle Torque | 203 Nm (150 ft-lb) @ 500 RPM | 203 Nm (150 ft-lb) @ 500 RPM |
| Tool Capacity | 12-station BOT | 12-station BOT |
| Chuck Size | 210 mm (8.3 in) | 210 mm (8.3 in) |
| Bar Capacity | 63.5 mm (2.5 in) | 63.5 mm (2.5 in) |
| Control | Haas Next Generation Control (NGC) | Haas Next Generation Control (NGC) |
| Max Swing | 419 mm (16.5 in) | 533 mm (21 in) ▲ |
| Max Cutting Diameter | 305 mm (12 in) | 330 mm (13 in) ▲ |
| Max Cutting Length | 305 mm (12 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 | 200 mm (7.9 in) | 213 mm (8.4 in) ▲ |
| Z Axis Travel | 406 mm (16 in) | 572 mm (22.5 in) ▲ |
| Price Range | $50,000 - $80,000 ▲ | $55,000 - $85,000 |
Advantages
Haas ST-15
- More competitive pricing at $50,000 - $80,000 compared to $55,000 - $85,000
- Backed by Haas Automation's dealer and service network for parts and support
- Production bar work in 2-inch to 2.5-inch stock where the ST-10's 1.75-inch capacity falls short
Haas ST-20
- Superior max swing at 533 mm (21 in) vs 419 mm (16.5 in)
- Superior max cutting diameter at 330 mm (13 in) vs 305 mm (12 in)
- Superior max cutting length at 572 mm (22.5 in) vs 305 mm (12 in)
- Superior x axis travel at 213 mm (8.4 in) vs 200 mm (7.9 in)
- Superior z axis travel at 572 mm (22.5 in) vs 406 mm (16 in)
Verdict
The Haas ST-20 edges ahead on specifications in this comparison, particularly in max swing and max cutting diameter. However, the Haas ST-15 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.