Haas ST-45SY
Image: haascnc.com, Haas Automation
Key Specifications
X Travel
Y Travel
Z Travel
Max Spindle
Spindle Power
Max Turn Length
How much does the Haas ST-45SY cost?
Manufacturer list price
As published by Haas Automation, verified 2026-10-02. Options, tooling, freight and installation are extra.
Overview
The Haas ST-45SY adds a Y axis, a C axis and BMT75 live tooling to a large-bore lathe with 28 in (711 mm) of Z travel. Y travel is ± 3 in (± 76 mm), live tools run to 4,000 rpm, and the main spindle has a 7 in (177.8 mm) bore behind an A2-11 nose.
The milling side is sized for work on big parts, not for speed. The C axis is rated 5 hp (3.7 kW), turns at up to 49 rpm and positions to 0.01°, with interpolated motion as well as positioning. Its brake is 21.5 in (546 mm) in diameter and holds 450 ft-lbf (610 N·m), and that holding torque is what resists the cut when a live tool mills or drills off-centre against a clamped spindle. Y thrust is 2,300 lbf (10,231 N), against 5,500 lbf (24,465 N) on X and 9,000 lbf (40,034 N) on Z.
The Y axis costs some turning envelope and some rapid speed. Maximum turning diameter is 27.5 in (699 mm) inside a 35.5 in (902 mm) swing, and X and Y rapid at 472 ipm (12 m/min) while Z keeps 710 ipm (18 m/min). The two-axis ST-40S, with the same 28 in of Z travel, turns 30 in (762 mm). A ± 3 in stroke is also narrow next to a 27.5 in part: flats, keyways and cross holes near the axis are within reach of Y alone, while a bolt circle on a wide flange has to be indexed round on the C axis.
For turning, the spindle is geared: 40 hp (29.8 kW) through a 2-speed gearbox, 1,400 ft-lbf (1,898 N·m) at 150 rpm and a 1,400 rpm ceiling. An XP option lifts that to 55 hp (41 kW) and 2,100 ft-lbf (2,847 N·m) at 150 rpm.
An 18 in (457 mm) chuck is listed as an option, and bar capacity is 6.5 in (165 mm) with optional workholding. The turret has 12 stations and indexes in 2 s, and the MT5 tailstock travels 26 in (660 mm). Haas's starting price is US$228,995.
Full Specifications
| Parameter | Value |
|---|---|
| Chuck Optional | 18 in (457 mm) |
| Max Swing | 35.5 in (902 mm) |
| Max Turning Diameter | 27.5 in (699 mm) |
| Max Turning Length | 28 in (711 mm) |
| Bar Capacity with Opt Workholding | 6.5 in (165 mm) |
| X-Axis Travel | 20 in (508 mm) |
| Y-Axis Travel | ± 3 in (± 76 mm) |
| Z-Axis Travel | 28 in (711 mm) |
| Rapid Traverse X | 472 ipm (12 m/min) |
| Rapid Traverse Y | 472 ipm (12 m/min) |
| Rapid Traverse Z | 710 ipm (18 m/min) |
| Max Thrust X | 5,500 lbf (24,465 N) |
| Max Thrust Y | 2,300 lbf (10,231 N) |
| Max Thrust Z | 9,000 lbf (40,034 N) |
| Spindle Nose | A2-11 |
| Spindle Drive | 2-Speed Gearbox |
| Spindle Motor Power | 40 hp (29.8 kW) |
| Max Spindle Speed | 1,400 rpm |
| Spindle Torque | 1,400 ft-lbf @ 150 rpm (1,898 N·m @ 150 rpm) |
| Spindle Bore | 7 in (177.8 mm) |
| Xp Option Drive System | 2-Speed Gearbox |
| Xp Option Max Rating | 55 hp (41 kW) |
| Xp Option Max Speed | 1,400 rpm |
| Xp Option Max Torque | 2,100 ft-lbf @ 150 rpm (2,847 N·m @ 150 rpm) |
| Xp Option Input AC Voltage Low | 220 VAC |
| Xp Option Full Load Amps Low | 105 A |
| Xp Option Input AC Voltage High | 440 VAC |
| Xp Option Full Load Amps High | 53 A |
| C Axis Max Rating | 5 hp (3.7 kW) |
| C Axis Speed | 49 rpm |
| C Axis Positioning | 0.01 ° |
| C Axis Brake Diameter | 21.5 in (546 mm) |
| C Axis Brake Holding Torque | 450 ft-lbf (610 N·m) |
| C Axis Control Type | Interpolated Motion and Positioning |
| Tailstock Taper | MT5 |
| Tailstock Travel | 26 in (660 mm) |
| Tailstock Max Thrust Acme | 3,000 lbf (13,345 N) |
| Tailstock Min Thrust Acme | 200 lbf (890 N) |
| Turret Stations | 12 |
| Turret OD Vs ID Tools | Any Combination (will vary with turret) |
| Turret Index Time | 2 s |
| Turret Boring Bar Rear Clearance From Turret Face | 4.5 in (114 mm) |
| Turret Tooling | BMT75 |
| Live Tool Speed | 4,000 rpm |
| Live Tooling | BMT75 |
| Coolant Capacity | 95 gal (360 L) |
| Air Required | 4 scfm @ 100 psi (113 L/min @ 6.9 bar) |
| Inline Air Hose | 3/8 in |
| Air Coupler | 3/8 in |
| Air Pressure Min | 80 psi (5.5 bar) |
| Electrical Service (low voltage) | 220 VAC 3-phase, 70 A |
| Electrical Service (high voltage) | 440 VAC 3-phase, 35 A |
| Shipping Domestic Pallet | 217 × 95 × 116 in (551 × 241 × 295 cm) |
| Shipping Export Crate | 217 × 95.5 × 120.5 in (551 × 243 × 306 cm) |
Specifications sourced from haascnc.com — verified 2026-10-02
Strengths & Limitations
Strengths
- Y travel of ± 3 in (± 76 mm) and 4,000 rpm BMT75 live tooling on a lathe with a 7 in (177.8 mm) bore
- C-axis brake 21.5 in (546 mm) in diameter with 450 ft-lbf (610 N·m) of holding torque
- C axis positions to 0.01° and interpolates, at up to 49 rpm
- Geared 40 hp (29.8 kW) spindle with 1,400 ft-lbf (1,898 N·m) at 150 rpm
- XP option: 55 hp (41 kW) and 2,100 ft-lbf (2,847 N·m) at 150 rpm
Limitations
- Main spindle stops at 1,400 rpm; the ST-40LY runs to 2,400 rpm with the same Y travel and live-tool speed
- X and Y rapids are 472 ipm (12 m/min), against 710 ipm (18 m/min) on Z
- Turning diameter is 27.5 in (699 mm), where the two-axis ST-40S turns 30 in (762 mm)
- The chuck is an option in the table, and the 6.5 in (165 mm) bar capacity assumes optional workholding
- Z travel of 28 in (711 mm) and 26 in (660 mm) of tailstock travel rule out long shafts
Best For
Frequently Asked Questions
01
Y travel is ± 3 in (± 76 mm), with 2,300 lbf (10,231 N) of thrust and a 472 ipm (12 m/min) rapid. It lets a live tool cut off the spindle centreline, which is what flats, keyways and offset holes need. Live tools use BMT75 tooling and run to 4,000 rpm.
02
The C axis has a 5 hp (3.7 kW) maximum rating and turns at up to 49 rpm. Positioning is 0.01°, and the control type is listed as interpolated motion and positioning. The brake is 21.5 in (546 mm) in diameter and holds 450 ft-lbf (610 N·m), which is the limit for off-centre milling and drilling against a clamped spindle.
03
Both have ± 3 in (± 76 mm) of Y, 472 ipm (12 m/min) X and Y rapids, a 27.5 in (699 mm) turning diameter and 4,000 rpm live tools. The ST-40LY has 80 in (2,032 mm) of Z, a 4.62 in (117.3 mm) bore and 2,400 rpm. The ST-45SY has 28 in (711 mm) of Z, a 7 in (177.8 mm) bore and 1,400 rpm.
04
The table lists the chuck as an option, at 18 in (457 mm). Bar capacity is given as 6.5 in (165 mm) with optional workholding, slightly under the 7 in (177.8 mm) spindle bore. Settle the chuck, jaws and any draw tube with Haas when the machine is quoted, because they decide what stock the bore can actually pass.
05
220 VAC three-phase at 70 A, or 440 VAC three-phase at 35 A. With the XP spindle option (55 hp / 41 kW) the full-load figures are 105 A at 220 VAC and 53 A at 440 VAC. Air demand is 4 scfm at 100 psi (113 L/min at 6.9 bar), with 80 psi (5.5 bar) as the minimum supply pressure.
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