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 share 8.4 in (213 mm) of X and 22.5 in (572 mm) of Z travel, 22.5 in (572 mm) of turning length and a 6,000 rpm sub-spindle. The ST-20Y adds Y-axis milling with a BMT-65 turret; the ST-25 adds spindle power and bar capacity.
The ST-25 is rated 30 hp (22.4 kW) and 300 ft-lbf @ 500 rpm against 20 hp (14.9 kW) and 150 ft-lbf, takes 3 in (76 mm) bar against 2.5 in (64 mm), swings 13 in (330 mm) against 11.75 in (298 mm) and carries a 10 in (254 mm) chuck against 8.3 in (210 mm). It also rapids at 945 ipm (24 m/min) against 472 ipm (12 m/min). The ST-20Y spins faster, 4,000 rpm against 3,400 rpm. Haas lists the ST-20Y at US$114,995 and the ST-25 at US$80,995.
Specifications Comparison
| Specification | Haas ST-20Y | Haas ST-25 |
|---|---|---|
| X-Axis Travel | 8.4 in (213 mm) | 8.4 in (213 mm) |
| Z-Axis Travel | 22.5 in (572 mm) | 22.5 in (572 mm) |
| Max Turning Diameter | 11.75 in (298 mm) | 13 in (330 mm) ▲ |
| Max Turning Length | 22.5 in (572 mm) | 22.5 in (572 mm) |
| Bar Capacity | 2.5 in (64 mm) | 3 in (76 mm) ▲ |
| Chuck Size | 8.3 in (210 mm) | 10 in (254 mm) |
| Max Spindle Speed | 4,000 rpm ▲ | 3,400 rpm |
| Spindle Power | 20 hp (14.9 kW) | 30 hp (22.4 kW) ▲ |
| Spindle Torque | 150 ft-lbf @ 500 rpm (203 N·m @ 500 rpm) | 300 ft-lbf @ 500 rpm (407 N·m @ 500 rpm) ▲ |
| Spindle Taper / Nose | A2-6 | A2-6 |
| Sub-Spindle Speed | 6,000 rpm | 6,000 rpm |
| Tool Capacity | 12 | 12-Station BOT |
| Rapid Traverse | 472 ipm (12 m/min) | 945 ipm (24 m/min) ▲ |
| Machine Weight | 10,480 lb (4,754 kg) | 9,000 lb (4,083 kg) |
| Published List Price | US$114,995 | US$80,995 |
Advantages
Haas ST-20Y
- Y-axis milling with a 12-station BMT-65 turret
- 4,000 rpm main spindle against 3,400 rpm
Haas ST-25
- 300 ft-lbf (407 N·m) of torque against 150 ft-lbf (203 N·m)
- 3 in (76 mm) bar capacity against 2.5 in (64 mm)
- 945 ipm (24 m/min) rapids against 472 ipm (12 m/min)
- Lower published list price, US$80,995 against US$114,995
Verdict
Choose the ST-20Y for short-run parts up to 2.5 in (64 mm) bar with cross-holes, flats or keyways that you want finished in one setup. Choose the ST-25 for heavier roughing in steel, stainless and cast iron, and for 3 in (76 mm) bar work, where double the torque and 30 hp matter more than milling; it also lists at US$80,995 against US$114,995.