Haas ST-15Y
Key Specifications
Max Spindle
Tool Capacity
Spindle Power
max part swing
max cutting diameter
max cutting length
Overview
The Haas ST-15Y is a compact Y-axis turning center with live tooling, C-axis, and an optional sub-spindle, packing mill-turn capability into the smallest footprint in the Haas ST lineup. With a 419 mm (16.5 in) max part swing, 279 mm (11 in) max cutting diameter, 406 mm (16 in) max cutting length, and a 64 mm (2.5 in) bar capacity through an A2-6 spindle, the ST-15Y is designed for complex small parts that need turning, milling, drilling, and tapping in a single setup.
The 14.9 kW (20 hp) main spindle runs a belt drive at up to 4,000 RPM, producing 203 Nm (150 ft-lb) of torque at 500 RPM. The Y-axis provides +/- 51 mm (2.0 in) of travel, and the BMT45 live tooling turret spins at up to 4,000 RPM for milling and cross-drilling operations. The C-axis enables interpolated motion and positioning to 0.01 degrees, with a 339 Nm (250 ft-lb) brake holding torque. An optional sub-spindle with A2-5 nose runs up to 6,000 RPM for backworking operations, enabling complete done-in-one machining.
Starting at approximately $108,995, the ST-15Y delivers genuine mill-turn capability at a price point that makes multi-tasking accessible to smaller shops. The 12-station BMT45 turret, Y-axis, C-axis, and available sub-spindle enable shops to produce complete parts in a single setup, eliminating second-op VMC work and reducing handling, fixturing, and work-in-process. For medical, aerospace, firearms, and precision component manufacturers running small complex parts, the ST-15Y is the entry point to Haas mill-turn machining. Specs sourced from Haas Automation published data.
Full Specifications
| Parameter | Value |
|---|---|
| Max Part Swing | 419 mm (16.5 in) |
| Max Cutting Diameter | 279 mm (11 in) with BMT45 turret |
| Max Cutting Length | 406 mm (16 in) |
| Chuck Size | 210 mm (8.3 in) |
| Bar Capacity | 64 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 |
| Spindle Drive | Direct Speed, Belt Drive |
| X Axis Travel | 200 mm (7.88 in) |
| Y Axis Travel | +/- 51 mm (2.0 in) |
| Z Axis Travel | 406 mm (16 in) |
| Rapid Traverse X | 12.0 m/min (472 ipm) |
| Rapid Traverse Y | 12.0 m/min (472 ipm) |
| Rapid Traverse Z | 30.5 m/min (1,200 ipm) |
| Max Thrust X | 10,676 N (2,400 lbf) |
| Max Thrust Y | 10,231 N (2,300 lbf) |
| Max Thrust Z | 16,458 N (3,700 lbf) |
| C Axis Max Speed | 60 RPM |
| C Axis Positioning | +/- 0.01 degrees |
| C Axis Brake Torque | 339 Nm (250 ft-lb) |
| Sub Spindle Nose | A2-5 (optional) |
| Sub Spindle Speed Max | 6,000 RPM |
| Sub Spindle Sync Speed | 4,800 RPM |
| Live Tooling Speed | 4,000 RPM |
| Live Tooling Type | BMT45 |
| Tool Capacity | 12 stations |
| Tailstock Taper | MT3 |
| Coolant Capacity | 114 L (30 gal) |
| Machine Weight | 3,583 kg (7,900 lb) |
| CNC Control | Haas Next Generation Control (NGC) |
Specifications sourced from haascnc.com — verified 2026-03-28
Strengths & Limitations
Strengths
- Genuine Y-axis, C-axis, and live tooling capability at a ~$109K starting price makes mill-turn machining accessible to shops that cannot justify $200K+ multi-tasking machines
- BMT45 turret with 4,000 RPM live tooling enables cross-drilling, milling flats, hexes, keyways, and tapping in the same setup as turning
- Optional sub-spindle with 6,000 RPM enables complete done-in-one machining with backworking, eliminating second-op handling entirely
- Compact footprint with 7,900 lb machine weight fits into tight shop floor layouts without heavy foundation requirements
- 4,000 RPM main spindle with belt drive provides good surface speed for aluminum and smaller-diameter finishing work
Limitations
- 20 hp spindle limits heavy roughing in stainless, Inconel, and hardened steels compared to the 30 hp ST-20Y and 40 hp ST-30Y
- 16-inch max cutting length and 11-inch cutting diameter restrict the ST-15Y to small parts — shops with larger work need to step up to the ST-20Y
- 2.5-inch bar capacity limits production bar stock sizes; the ST-20Y offers the same bar capacity but with a larger cutting envelope
- +/- 2.0-inch Y-axis travel is tight for complex milling operations on larger workpieces
Best For
Frequently Asked Questions
01
The Haas ST-15Y starts at approximately $108,995 for the base configuration with Y-axis, C-axis, and BMT45 live tooling turret. Adding the sub-spindle, tailstock, high-pressure coolant, chip conveyor, and parts catcher can push the configured price to $140,000-$165,000. The sub-spindle option alone adds approximately $20,000-$25,000.
02
The ST-20Y offers a larger cutting envelope (13x22.5 inches vs 11x16 inches), 30 hp vs 20 hp, and more swing capacity. If your parts fit within the ST-15Y's 11x16-inch envelope, the ST-15Y saves approximately $20-30K and has a smaller footprint. If any of your parts exceed the ST-15Y's capacity, or you need more spindle power for tougher materials, step up to the ST-20Y.
03
Yes, the ST-15Y includes the BMT45 live tooling turret, Y-axis, and C-axis as standard equipment. This is a core feature of the machine, not an option. The 12-station turret supports any combination of live and static tools, with 4,000 RPM live tool speed.
04
For parts that fit within the 11x16-inch cutting envelope, yes. The Y-axis, C-axis, and live tooling enable milling, cross-drilling, and tapping operations that would otherwise require a second setup on a VMC. The optional sub-spindle adds backworking capability for complete done-in-one machining. Most shops see 30-50% cycle time reduction by consolidating operations.
Videos
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