Haas ST-25Y
Key Specifications
Max Spindle
Tool Capacity
Spindle Power
max cutting diameter
max cutting length
max swing over front apron
Overview
The Haas ST-25Y sits right between the ST-20Y and the older ST-30Y in the Haas turning center lineup. Haas redesigned this platform from the ground up, bumping the bar capacity to 76 mm (3.0 in) and fitting a 254 mm (10 in) chuck on an A2-6 spindle nose. That larger drawtube bore covers the vast majority of production bar stock without needing a big-bore machine.
The spindle delivers 22.4 kW (30 hp) with 407 Nm (300 ft-lb) of torque at 500 RPM, topping out at 3,400 RPM. The torque curve is the real story here. At 300 ft-lb, you can push aggressive feeds in steel and stainless without the spindle bogging down on interrupted cuts. An optional gearbox pushes torque to 1,356 Nm (1,000 ft-lb) at 150 RPM for large-diameter heavy turning.
Y-axis travel is 102 mm (4.0 in) total, giving you plus or minus 50.8 mm of cross-travel on the 12-station BMT-65 turret. Live tooling spins at 6,000 RPM with 3.7 kW (5 hp) and C-axis positioning at plus or minus 0.01 degrees. That combination handles cross-drilling, flat milling, hex machining, and tapping without pulling the part and walking it to a mill. The BMT-65 turret clamps tools more rigidly than older VDI or bolt-on designs, which matters when you're milling on a lathe.
Haas runs the NGC control across the entire lineup. If your shop already runs Haas mills, your operators can jump on the ST-25Y with minimal retraining. The control supports G-code, conversational programming, and full C-axis interpolation for complex live tooling work.
At roughly $105,000-$130,000 configured, the ST-25Y fills the gap between the smaller ST-20Y and the larger ST-30Y. It gives you the 30 hp spindle and 3-inch bar capacity of the ST-30Y in a slightly more compact package. Shops running production bar work in the 50-75 mm range will find this machine hits the sweet spot between capability and floor space. Popular in job shops, automotive component manufacturers, and hydraulic fitting producers that need Y-axis milling without dedicating a second-op VMC. Specs sourced from Haas Automation published data.
Full Specifications
| Parameter | Value |
|---|---|
| Max Cutting Diameter | 349 mm (13.75 in) |
| Max Cutting Length | 584 mm (23 in) |
| Max Swing Over Front Apron | 806 mm (31.75 in) |
| Max Swing Over Cross Slide | 527 mm (20.75 in) |
| Max Spindle Speed | 3,400 RPM |
| Spindle Motor Power | 22.4 kW (30 hp) |
| Spindle Torque | 407 Nm (300 ft-lb) @ 500 RPM |
| Spindle Torque Optional Gearbox | 1,356 Nm (1,000 ft-lb) @ 150 RPM |
| Spindle Nose | A2-6 |
| Spindle Bore | 89 mm (3.5 in) |
| Chuck Size | 254 mm (10 in) |
| Bar Capacity | 76 mm (3.0 in) |
| X Axis Travel | 318 mm (12.5 in) |
| Y Axis Travel | 102 mm (4.0 in) total / ±50.8 mm (±2.0 in) |
| Z Axis Travel | 584 mm (23 in) |
| Rapid Traverse X Y | 12.0 m/min (472 IPM) |
| Rapid Traverse Z | 24.0 m/min (945 IPM) |
| Tool Capacity | 12-station BMT-65 turret |
| Live Tooling Speed | 6,000 RPM |
| Live Tooling Power | 3.7 kW (5 hp) |
| C Axis Positioning | ±0.01° |
| Coolant Capacity | 208 L (55 gal) |
| CNC Control | Haas Next Generation Control (NGC) |
Specifications sourced from haascnc.com — verified 2026-03-28
Strengths & Limitations
Strengths
- 30 hp spindle with 300 ft-lb of torque matches the ST-30Y's power output in a slightly more compact footprint
- 76 mm (3.0 in) bar capacity covers the most common production bar stock sizes without upgrading to a big-bore machine
- BMT-65 turret with 6,000 RPM live tooling provides genuine milling rigidity for cross-drilling, tapping, and flat work
- Optional gearbox delivers 1,000 ft-lb of torque at 150 RPM for large-diameter interrupted cuts in tough materials
- Same NGC control as every Haas mill and lathe, eliminating cross-training time for operators
- Y-axis travel of plus or minus 50.8 mm enables complex off-center features without a second-op VMC setup
- Haas Factory Outlet network provides same-day parts availability and responsive field service across North America
Limitations
- 3,400 RPM max spindle speed limits surface speed on small-diameter aluminum finishing work
- 3.7 kW (5 hp) live tooling motor is adequate for drilling and tapping but struggles with aggressive milling cuts or deep pocketing
- No sub-spindle option on the base ST-25Y limits done-in-one capability for parts needing back-working
- Resale value drops faster than comparable Mazak or Okuma Y-axis lathes in the used market
- Forum reports of occasional turret alignment drift on ST-series Y-axis machines requiring periodic recalibration
Best For
Frequently Asked Questions
01
Base price starts around $105,000. Adding common options like a tailstock, chip conveyor, high-pressure coolant, parts catcher, and bar feeder interface pushes the configured price to $120,000-$130,000. The optional gearbox adds roughly $5,000 but delivers 1,000 ft-lb of torque at 150 RPM. Used ST-25Y machines typically sell in the $50,000-$80,000 range depending on hours and options.
02
The ST-25Y steps up to a 10-inch chuck, 3.0-inch bar capacity, and 30 hp spindle compared to the ST-20Y's 8.3-inch chuck, 2.5-inch bar capacity, and 20 hp. The ST-25Y also uses the BMT-65 turret versus the ST-20Y's bolt-on design, giving better live tooling rigidity. The trade-off is about $25,000-$30,000 more and a lower 3,400 RPM max spindle speed versus 4,000 RPM.
03
The ST-25Y and ST-30Y share the same spindle, turret, and power specs. The ST-30Y has a longer bed with 826 mm (32.5 in) max cutting length compared to the ST-25Y's 584 mm (23 in). If your parts fit within 23 inches of turning length, the ST-25Y saves floor space and a few thousand dollars.
04
It handles cross-drilling, tapping, flat milling, and shallow pocketing well with 3.7 kW of live tooling power and BMT-65 rigidity. For aggressive milling like deep pockets or 3D surfacing, you will want a dedicated mill-turn like the Mazak INTEGREX or Okuma MULTUS.
05
Yes. The 76 mm (3.0 in) bar capacity works with the Haas Bar Feeder V2 and most third-party bar feeders. The bar feeder interface is a common add-on option for production turning. Haas also offers their own servo bar feeder designed for the ST platform.
Videos
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Community Discussions
Troubleshooting and problem-solving — turret alarm issues. - CNCzone
Community discussion — Newbie SINGLE POINT NPT THREADING ON HAAS LATHE - CNCzone
Troubleshooting and problem-solving — ST25Y error 622 c axis engagement - cnczone.com
Troubleshooting and problem-solving — Haas Lathes - CNCzone
Comparison and buying advice — Tailstock part catcher on Haas ST25Y : r/Machinists - RedditI am running a Haas ST25 without a tailstock. Tips ... - RedditHaas has quality gone down? : r/Machinists - RedditIs Haas Really That Bad? : r/Machinists - RedditMilling CNC precision & stability - why does Ha
Comparison and buying advice — I am running a Haas ST25 without a tailstock. Tips ... - RedditHaas has quality gone down? : r/Machinists - RedditIs Haas Really That Bad? : r/Machinists - RedditMilling CNC precision & stability - why does Haas suck? : r ...First time programming the y axis for more t
Community discussion — Haas has quality gone down? : r/Machinists - Reddit
Community discussion — Is Haas Really That Bad? : r/Machinists - Reddit
Links to community discussions. Summaries are editorial — visit the original thread for full context.
