Haas ST-15
Key Specifications
Max Spindle
Tool Capacity
Spindle Power
max swing
max cutting diameter
max cutting length
Overview
The Haas ST-15 fills the gap between the compact ST-10 and the mid-size ST-20 by pairing the ST-10's small footprint with a 63.5 mm (2.5 in) bar capacity and 210 mm (8.3 in) chuck on an A2-6 spindle nose. It is the smallest machine in the Haas lineup that accepts 2.5-inch bar stock, making it the go-to choice for shops that need bigger bore capacity without stepping up to the larger ST-20 frame.
The spindle puts out 14.9 kW (20 hp) and 203 Nm (150 ft-lb) of torque at 500 RPM, topping out at 4,000 RPM. That torque curve is a meaningful step up from the ST-10's 15 hp and positions the ST-15 for heavier cuts in steel and stainless. The 88.9 mm (3.5 in) spindle bore handles through-spindle work comfortably within the 2.5-inch bar range.
Max cutting envelope is 305 mm (12 in) diameter by 305 mm (12 in) length with axis travels of 200 mm (7.9 in) in X and 406 mm (16 in) in Z. Rapids hit 30.5 m/min (1,200 ipm) on both axes. The 12-station bolt-on turret accepts any combination of OD and ID tools. The 419 mm (16.5 in) swing gives clearance for larger chuck jaws and fixtures.
Haas designed the ST-15 as a big-bore machine in a small-footprint package. Shops running fittings, couplings, and hydraulic components in 2-inch bar stock get the bore capacity they need without dedicating floor space to the larger ST-20 platform. The NGC control is standard across the Haas lineup, keeping operator training consistent.
At roughly $50,000-$80,000 configured, the ST-15 sits between the ST-10 and ST-20 in both price and capability. It competes with the Doosan Lynx 2100 and Okuma GENOS L2000-e at a lower price point while offering the larger bar capacity that many production shops require. Specs sourced from Haas Automation published data.
Full Specifications
| Parameter | Value |
|---|---|
| Max Swing | 419 mm (16.5 in) |
| Max Cutting Diameter | 305 mm (12 in) |
| Max Cutting Length | 305 mm (12 in) |
| Chuck Size | 210 mm (8.3 in) |
| Bar Capacity | 63.5 mm (2.5 in) |
| Spindle Nose | A2-6 |
| Spindle Bore | 88.9 mm (3.5 in) |
| Max Spindle Speed | 4,000 RPM |
| Spindle Motor Power | 14.9 kW (20 hp) |
| Spindle Torque | 203 Nm (150 ft-lb) @ 500 RPM |
| X Axis Travel | 200 mm (7.9 in) |
| Z Axis Travel | 406 mm (16 in) |
| Rapid Traverse X | 30.5 m/min (1,200 ipm) |
| Rapid Traverse Z | 30.5 m/min (1,200 ipm) |
| Max Thrust X | 14,679 N (3,300 lbf) |
| Max Thrust Z | 14,679 N (3,300 lbf) |
| Tool Capacity | 12-station BOT |
| Coolant Capacity | 114 L (30 gal) |
| CNC Control | Haas Next Generation Control (NGC) |
Specifications sourced from haascnc.com — verified 2026-03-28
Strengths & Limitations
Strengths
- 2.5-inch bar capacity in the smallest Haas footprint that offers it, covering the most common production bar stock sizes
- 20 hp spindle with 150 ft-lb of torque provides a meaningful power step up from the ST-10 for steel and stainless work
- A2-6 spindle nose and 3.5-inch bore match the ST-20 platform, accepting the same workholding and collet systems
- Compact footprint close to the ST-10 saves floor space compared to the larger ST-20 frame
- Same NGC control and HFO service network as every other Haas machine, keeping training and support consistent
- Price point between $50K-$80K makes it accessible for small shops stepping up from the ST-10 or manual lathes
Limitations
- 4,000 RPM max spindle speed is lower than the ST-10's 6,000 RPM, limiting surface speeds on small-diameter aluminum parts
- 12 x 12-inch max cutting envelope is the same as the ST-10, so the ST-15 does not extend your reach for longer parts
- No Y-axis option on the base ST-15 means off-center features require the ST-15Y at additional cost
- 30-gallon coolant tank is small for sustained production runs with through-tool or high-pressure coolant
- BOT turret lacks the rigidity of BMT tooling for live tooling applications compared to the Y-axis variants
Best For
Frequently Asked Questions
01
Base price starts around $50,000. Adding common options like tailstock, chip conveyor, tool probe, parts catcher, and bar feeder interface pushes the configured price to $65,000-$80,000. Used ST-15 machines from 2018-2023 typically sell in the $30,000-$50,000 range depending on hours and included options.
02
The ST-20 has a larger cutting envelope at 330 x 572 mm (13 x 22.5 in) versus the ST-15's 305 x 305 mm (12 x 12 in). Both share the same 2.5-inch bar capacity, A2-6 spindle, 20 hp power, and 4,000 RPM speed. Choose the ST-15 when floor space is tight and your parts fit within the 12 x 12-inch envelope. Choose the ST-20 when you need longer parts or larger diameter work.
03
Haas increased the bar capacity to 63.5 mm (2.5 in) from the previous generation, upgraded the spindle to A2-6, and refined the casting geometry for better chip evacuation. The redesign brought the ST-15 much closer to the ST-20 in capability while maintaining the smaller footprint.
04
Yes. The 20 hp spindle and 150 ft-lb of torque handle 304 and 316 stainless at production feeds. The torque curve at 500 RPM gives strong low-end power for large-diameter interrupted cuts. For duplex stainless or Inconel, the ST-25 or ST-30 with 30 hp would be more appropriate.
Videos
Haas Automation, Inc.
Josiah Fallaise
Grupo Hi-Tec Subastas
Shelly Nunn
Haas Automation UK
Community Discussions
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Links to community discussions. Summaries are editorial — visit the original thread for full context.
