Machine Comparison
Haas ST-28Y vs Haas ST-35Y
Haas Automation vs Haas Automation · Mill-Turn Machines
Summary
The Haas ST-28Y and Haas ST-35Y are both from Haas Automation's mill-turn machines lineup, making this a common upgrade or lineup decision for shops already invested in the Haas Automation ecosystem. These machines are closely matched across most specifications, making the decision more about specific feature priorities, dealer support, and your existing shop ecosystem than raw spec advantages. Both machines are proven performers in production environments and represent solid investments for shops in the market for a mill-turn machine.
Specifications Comparison
| Specification | Haas ST-28Y | Haas ST-35Y |
|---|---|---|
| Max Spindle Speed | 3,200 RPM | 3,200 RPM |
| Spindle Power | 29.8 kW (40 hp) | 29.8 kW (40 hp) |
| Spindle Torque | 542 Nm (400 ft-lb) @ 500 RPM | 542 Nm (400 ft-lb) @ 500 RPM |
| Tool Capacity | 12-station BMT-65 turret | 12-station BMT-65 turret |
| Chuck Size | 305 mm (12 in) | 305 mm (12 in) |
| Bar Capacity | 102 mm (4.0 in) | 102 mm (4.0 in) |
| Machine Weight | 7,257 kg (16,000 lb) ▲ | 8,165 kg (18,000 lb) |
| Control | Haas Next Generation Control (NGC) | Haas Next Generation Control (NGC) |
| Max Cutting Diameter | 406 mm (16 in) | 406 mm (16 in) |
| Max Cutting Length | 711 mm (28 in) | 1,016 mm (40 in) ▲ |
| Max Swing Over Front Apron | 838 mm (33 in) | 838 mm (33 in) |
| Max Swing Over Cross Slide | 559 mm (22 in) | 559 mm (22 in) |
| Spindle Torque Optional Gearbox | 1,898 Nm (1,400 ft-lb) @ 150 RPM | 1,898 Nm (1,400 ft-lb) @ 150 RPM |
| Spindle Nose | A2-8 | A2-8 |
| Price Range | $110,000 - $140,000 ▲ | $125,000 - $155,000 |
Advantages
Haas ST-28Y
- Lighter at 7,257 kg (16,000 lb), potentially easier installation and lower foundation requirements
- More competitive pricing at $110,000 - $140,000 compared to $125,000 - $155,000
- Backed by Haas Automation's dealer and service network for parts and support
- Shops turning large-diameter bar stock up to 102 mm (4.0 in) with secondary milling operations
Haas ST-35Y
- Superior max cutting length at 1,016 mm (40 in) vs 711 mm (28 in)
- Backed by Haas Automation's dealer and service network for parts and support
- Long shaft production including pump shafts, drive shafts, and hydraulic cylinder components
Verdict
This is a close matchup. The Haas ST-28Y and Haas ST-35Y trade advantages across different specifications, making neither a clear winner on paper alone. Your decision should come down to practical factors: which dealer is closer, which control system your operators already know, what tooling ecosystem you're invested in, and which machine's specific strengths match your highest-volume work. Get quotes on both, run test cuts with your actual parts if possible, and factor in long-term service and support costs.