Haas ST-15LY
Key Specifications
Max Spindle
Spindle Taper
Tool Capacity
Spindle Power
max swing
max cutting diameter
Overview
The Haas ST-15LY combines the ST-15's big-bore-in-a-small-package design with a long bed and Y-axis mill-turn capability. With 610 mm (24 in) of Z-travel, +/-51 mm (+/-2.0 in) of Y-axis travel, and a BMT45 turret with 4,000 RPM live tooling, the ST-15LY handles complex longer parts that need both turning and milling in a single setup.
The A2-6 spindle delivers 14.9 kW (20 hp) and 203 Nm (150 ft-lb) of torque at 500 RPM, with a max speed of 4,000 RPM. The 63.5 mm (2.5 in) bar capacity and 210 mm (8.3 in) chuck step up meaningfully from the ST-10LY's 1.75-inch bore, covering the most common production bar stock sizes.
Max cutting diameter is approximately 279 mm (11 in) with the BMT45 turret. Axis travels are 200 mm (7.9 in) in X, +/-51 mm in Y, and 610 mm (24 in) in Z. Rapids run at 12 m/min (472 ipm) on X and Y, and 30.5 m/min (1,200 ipm) on Z. The C-axis holds +/-0.01 degrees for precision milling and positioning.
The ST-15LY occupies a sweet spot for shops running 2.5-inch bar stock on longer parts with off-center features. Hydraulic fittings, connector bodies, and instrumentation housings that need cross-drilling, flat milling, and tapping along their length are classic applications.
At roughly $115,000-$140,000 configured, the ST-15LY is a compact long-bed mill-turn machine that eliminates second-op VMC work on parts that the standard ST-15Y can't accommodate due to length. The NGC control handles Y-axis and C-axis programming without specialized training.
Full Specifications
| Parameter | Value |
|---|---|
| Max Swing | 419 mm (16.5 in) |
| Max Cutting Diameter | 11.00 in |
| Max Cutting Length | 32.5 in |
| Chuck Size | 5.3 in |
| Bar Capacity | 2.50 in |
| Spindle Nose | A2-6 |
| Spindle Bore | 1.50 in |
| Max Spindle Speed | 4,000 RPM |
| Spindle Motor Power | 20.0 hp |
| Spindle Torque | 203 Nm (150 ft-lb) @ 500 RPM |
| X Axis Travel | 200 mm (7.9 in) |
| Y Axis Travel | +/-51 mm (+/-2.0 in) |
| Z Axis Travel | 610 mm (24 in) |
| Rapid Traverse X Y | 12 m/min (472 ipm) |
| Rapid Traverse Z | 30.5 m/min (1,200 ipm) |
| Tool Capacity | 12 Stations |
| Live Tool Speed | 4,000 RPM |
| C Axis Accuracy | +/-0.01 degrees |
| Coolant Capacity | 30 gal |
| CNC Control | Haas Next Generation Control (NGC) |
| Capacities | S.A.E |
| Max Part Swing | 16.5 in |
| Travels | S.A.E |
| X Axis | 7.88 in |
| Y Axis | ± 2.0 in |
| Z Axis | 32.50 in |
| Feedrates | S.A.E |
| Rapids On X | 472 ipm |
| Rapids On Y | 472 ipm |
| Rapids On Z | 1200 ipm |
| Axis Motors | S.A.E |
| Max Thrust X | 2400 lbf |
| Max Thrust Y | 2300 lbf |
| Max Thrust Z | 3700 lbf |
| Spindle | S.A.E |
| Spindle Taper | A2-5 |
| Max Rating | 5.0 hp |
| Max Speed | 4000 rpm |
| Max Torque | 150.0 ft-lbf @ 500 rpm |
| Main Spindle C Axis | S.A.E |
| Positioning | 0.01 ° |
| Brake Diameter | 13.9 in |
| Brake Holding Torque | 250 ft-lbf |
| Control Type | Interpolated Motion and Positioning |
| Sub Spindle | S.A.E |
| Max Sync Speed W Main Spindle | 4800 rpm |
| Chuck Throat | Ø 1.30 in x 1.37 in DEEP |
| Drawbar Bore | Ø 1.00 in x 4.50 in DEEP |
| Integrated Brake Torque | 17 ft-lbf |
| Spindle Orientation Accuracy | ± 2.00 ° |
| Rapids | 400 ipm |
| Tailstock | S.A.E |
| Taper | MT3 |
| Hydraulic Quill Travel | 3.8 in |
| Manual Body Positioning | 44.0 in |
| Max Thrust | 1130 lbf |
| Min Thrust | 140 lbf |
| Turret | S.A.E |
| Boring Bar Rear Clearance | 3.80 in |
| Live Tooling | S.A.E |
| Tooling | BMT45 |
| General | S.A.E |
| Air Requirements | S.A.E |
| Air Required | 4 scfm @ 100 psi |
| Electrical Specification | S.A.E |
| Drive System | Direct Speed, Belt Drive |
| Input Ac Voltage Low | 220 VAC |
| Full Load Amps Low | 40 A |
| Input Ac Voltage High | 440 VAC |
| Full Load Amps High | 20 A |
| Dimensions Shipping | S.A.E |
| Domestic Pallet | 158.0 in x 70.0 in x 81.0 in |
| Export Pallet | 158.0 in x 70.0 in x 81.0 in |
| Machine Weight | 10000 lb |
Specifications sourced from haascnc.com — verified 2026-03-28
Strengths & Limitations
Strengths
- 2.5-inch bar capacity with Y-axis and live tooling on a long bed — the smallest Haas long-bed mill-turn with this bore size
- 610 mm (24 in) Z-axis travel handles longer complex parts that exceed the standard ST-15Y bed
- BMT45 turret with 4,000 RPM live tooling enables cross-drilling, flat milling, and tapping on longer parts
- A2-6 spindle nose and 3.5-inch bore match the ST-20 platform workholding systems
- 20 hp with 150 ft-lb torque handles steel and stainless at production feeds
- Compact footprint keeps floor space manageable for smaller shops adding long-bed mill-turn capability
Limitations
- 4,000 RPM max spindle speed limits small-diameter aluminum finishing compared to the ST-10LY's 6,000 RPM
- BMT45 turret is smaller than the BMT-65 on the ST-20LY, limiting milling aggressiveness
- 20 hp spindle is modest for heavy roughing in stainless or tough alloys on longer parts
- 30-gallon coolant tank may be undersized for sustained production with live tooling
Best For
Frequently Asked Questions
01
Base price starts around $115,000. Adding sub-spindle option, parts catcher, chip conveyor, and common options pushes the configured price to $130,000-$140,000. The long-bed Y-axis premium over the standard ST-15 is approximately $60,000-$65,000.
02
The ST-15LY adds approximately 200 mm (8 in) of Z-axis travel, going from 406 mm to 610 mm (24 in). The spindle, Y-axis, turret, and live tooling are identical. Choose the LY when your parts with off-center features regularly exceed the standard bed length.
03
The ST-20LY has a larger cutting envelope, 6,000 RPM live tooling on a BMT-65 turret, and more Z-travel at 813 mm (32 in). The ST-15LY is more compact and affordable with the same 2.5-inch bore and 20 hp. Choose the ST-15LY when parts fit within 12 x 20 inches. Choose the ST-20LY for larger parts or more aggressive milling.
04
Yes. The ST-15LY can be ordered with an optional sub-spindle for back-working operations. The sub-spindle combined with Y-axis and live tooling creates a comprehensive done-in-one manufacturing cell for complex longer parts.
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