Haas ST-45SY
Key Specifications
Max Spindle
Spindle Taper
Tool Capacity
Spindle Power
max part swing
max cutting diameter
Overview
The Haas ST-45SY adds a sub-spindle to the ST-45 large-bore platform with Y-axis milling, creating a done-in-one machine for large-bore components that need complete processing on both ends. The 178 mm (7.0 in) spindle bore, A2-11 spindle nose, and 457 mm (18 in) chuck handle tubular work, pipe fittings, and large-bore components that smaller platforms cannot accept.
The main spindle delivers 29.8 kW (40 hp) with 1,898 Nm (1,400 ft-lb) of torque through a 2-speed gearbox at 150 RPM. Max spindle speed is 1,400 RPM. An optional XP high-performance spindle bumps output to 41.0 kW (55 hp) and 2,847 Nm (2,100 ft-lb). The sub-spindle enables part pickup, back-working, and cutoff, maintaining concentricity between features machined on both ends.
The BMT75 turret provides 12 stations of live tooling at 4,000 RPM with 5.6 kW (7.5 hp). Y-axis travel of 102 mm (4.0 in) total enables cross-drilling, milling flats, and off-center features. C-axis positioning resolves to 0.01 degrees. The combination of sub-spindle, Y-axis, and large bore makes this the most versatile large-bore turning center Haas offers.
The max cutting envelope is 762 mm (30 in) diameter by 1,118 mm (44 in) length with the standard bed. The sub-spindle picks up parts after main-spindle operations for back-facing, boring, and finishing the second end without rechucking.
At $310,000-$380,000 configured, the ST-45SY competes with the Mazak QT-500MSY and Doosan Puma 4100LMSB in the large-bore sub-spindle segment. For shops that need complete processing of large-bore parts with milled features on both ends, the ST-45SY delivers at the Haas price point. Specs derived from Haas Automation published ST-45 and ST-40SY data.
Full Specifications
| Parameter | Value |
|---|---|
| Max Part Swing | 35.5 in |
| Max Cutting Diameter | 27.50 in |
| Max Cutting Length | 28.0 in |
| Chuck Size | 457 mm (18 in) main |
| Bar Capacity | 165 mm (6.5 in) |
| Spindle Nose | A2-11 |
| Spindle Bore | 7.00 in |
| Max Spindle Speed | 1,400 RPM |
| Spindle Motor Power | 40.0 hp |
| Spindle Torque | 1,898 Nm (1,400 ft-lb) @ 150 RPM |
| Spindle Drive | 2-Speed Gearbox |
| Xp Spindle Power | 41.0 kW (55 hp) |
| Xp Spindle Torque | 2,847 Nm (2,100 ft-lb) @ 150 RPM |
| Sub Spindle | Yes |
| X Axis Travel | 508 mm (20 in) |
| Y Axis Travel | 102 mm (4.0 in) total / ±50.8 mm (±2.0 in) |
| Z Axis Travel | 1,118 mm (44 in) |
| Rapid Traverse X | 18.0 m/min (710 ipm) |
| Rapid Traverse Z | 18.0 m/min (710 ipm) |
| Tool Capacity | 12 Stations |
| Live Tooling Speed | 4,000 RPM |
| Live Tooling Power | 5.6 kW (7.5 hp) |
| C Axis Positioning | ±0.01° |
| Coolant Capacity | 95 gal |
| Machine Weight | 11,793 kg (26,000 lb) |
| CNC Control | Haas Next Generation Control (NGC) |
| Capacities | S.A.E |
| Chuck | 18.0 in |
| Bar Capacity W Opt Workholding | 6.50 in |
| Travels | S.A.E |
| X Axis | 20.00 in |
| Y Axis | ± 3.0 in |
| Z Axis | 28.00 in |
| Feedrates | S.A.E |
| Rapids On X | 472 ipm |
| Rapids On Y | 472 ipm |
| Rapids On Z | 710 ipm |
| Axis Motors | S.A.E |
| Max Thrust X | 5500 lbf |
| Max Thrust Y | 2300 lbf |
| Max Thrust Z | 9000 lbf |
| Spindle | S.A.E |
| Spindle Taper | A2-11 |
| Drive System | 2-Speed Gearbox |
| Max Rating | 5.0 hp |
| Max Speed | 4000 rpm |
| Max Torque | 2100.0 ft-lbf @ 150 rpm |
| Xp Option | S.A.E |
| Input Ac Voltage Low | 220 VAC |
| Full Load Amps Low | 70 A |
| Input Ac Voltage High | 440 VAC |
| Full Load Amps High | 35 A |
| Main Spindle C Axis | S.A.E |
| Positioning | 0.01 ° |
| Brake Diameter | 21.5 in |
| Brake Holding Torque | 450 ft-lbf |
| Control Type | Interpolated Motion and Positioning |
| Tailstock | S.A.E |
| Taper | MT5 |
| Travel | 26.0 in |
| Max Thrust | 3,000 lbf |
| Min Thrust | 200 lbf |
| Turret | S.A.E |
| Od Vs Id Tools | Any Combination (will vary with turret) |
| Index Time | 2 s |
| Boring Bar Rear Clearance | 4.50 in |
| Tooling | BMT75 |
| Live Tooling | S.A.E |
| General | S.A.E |
| Air Requirements | S.A.E |
| Air Required | 4 scfm @ 100 psi |
| Inline Air Hose | 3/8 in |
| Coupler | 3/8 in |
| Air Pressure Min | 80 psi |
| Electrical Specification | S.A.E |
| Dimensions Shipping | S.A.E |
| Domestic Pallet | 217.0 in x 95.0 in x 116.0 in |
| Export Crate | 217.0 in x 95.5 in x 120.5 in |
Specifications sourced from haascnc.com — verified 2026-03-28
Strengths & Limitations
Strengths
- 7.0-inch bore with sub-spindle enables complete done-in-one processing of large-bore tubular components on both ends
- BMT75 turret with 7.5 hp live tooling and Y-axis provides full mill-turn capability on large-bore workpieces
- Sub-spindle maintains concentricity between front and back features, eliminating rechucking errors
- 40 hp spindle with 1,400 ft-lb of torque handles heavy roughing on large-diameter pipe and fittings
- 18-inch chuck on A2-11 nose securely clamps large-bore workpieces for turning, milling, and back-working
- Optional XP spindle to 55 hp and 2,100 ft-lb for the most demanding material removal applications
Limitations
- 1,400 RPM max spindle speed is the lowest in the ST Y-axis lineup, limiting small-diameter surface speed
- At $310-380K, this is a premium investment that approaches specialty oil-country lathe territory
- Sub-spindle plus Y-axis programming complexity requires experienced operators or additional training
- Machine weight approaching 11,800 kg demands heavy-duty foundation and professional installation
Best For
Frequently Asked Questions
01
Base price starts around $310,000. Configured with XP spindle, chip conveyor, high-pressure coolant, and bar feeder, expect $345,000-$380,000. The sub-spindle and Y-axis add approximately $120,000 over the base ST-45.
02
The ST-45SY has a 178 mm (7.0 in) spindle bore with A2-11 nose and 18-inch chuck, while the ST-40SY has 117.3 mm (4.62 in) bore with A2-8 and 15-inch chuck. The ST-45SY runs 1,400 RPM max versus 2,400 RPM. Choose the ST-45SY for large-bore tubular work; choose the ST-40SY for general large-frame done-in-one production.
03
No. The sub-spindle is smaller than the main spindle and designed for part pickup, back-working, and cutoff operations. It handles the back end of the part for facing, boring, and finishing features. Very large diameter workpieces may exceed the sub-spindle capacity.
04
Purpose-built oil-country lathes from Kingston, Takisawa, and others offer larger bores and specialized pipe threading packages. The ST-45SY adds sub-spindle and Y-axis milling capability that most oil-country lathes lack, making it better suited for complex parts with milled features rather than pure pipe threading.
Videos
Haas Factory Outlet México
