Haas ST-55SY
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-55SY cost?
Manufacturer list price
As published by Haas Automation, verified 2026-10-02. Options, tooling, freight and installation are extra.
Overview
The Haas ST-55SY puts a Y axis, a C axis and 4,000 rpm BMT75 live tools on a lathe with a 12.5 in (318 mm) spindle bore. Z travel is 44 in (1,118 mm), Y travel is ± 3 in (± 76 mm) and the maximum turning diameter is 27.5 in (699 mm).
The point of the combination is to finish large tubular parts without moving them to a mill. Cross holes, slots, wrench flats and milled faces near a pipe end can be cut by the turret's live tools while the part is still held in the spindle. The C axis interpolates and positions to 0.01°, at up to 49 rpm on a 5 hp (3.7 kW) rating, and its brake holds 450 ft-lbf (610 N·m). That brake figure, not the main spindle torque, is the limit when a live tool pushes off-centre against a clamped part. Y thrust is 2,300 lbf (10,231 N).
For turning, the spindle is rated 55 hp (41 kW) with a 2-speed gearbox and 4,250 ft-lbf (5,762 N·m) at 30 rpm, and it stops at 1,000 rpm. The A1-20 nose is fitted front and rear. No chuck size or bar capacity appears in the table, so the workholding at each end of the spindle is a matter to agree with Haas before the order.
Among the Y-axis siblings, the ST-40LY has the same ± 3 in of Y, the same 27.5 in turning diameter and the same 4,000 rpm live tools, on an A2-8 spindle with a 4.62 in (117.3 mm) bore, 2,400 rpm and 80 in (2,032 mm) of Z. The choice between them comes down to bore against length and speed.
The MT6 tailstock travels 42 in (1,067 mm). X and Y rapid at 472 ipm (12 m/min) and Z at 710 ipm. Power is 105 A at 220 VAC three-phase or 53 A at 440 VAC. Haas's starting price is US$396,995.
Full Specifications
| Parameter | Value |
|---|---|
| Max Swing | 35.5 in (902 mm) |
| Max Turning Diameter | 27.5 in (699 mm) |
| Max Turning Length | 44 in (1,118 mm) |
| X-Axis Travel | 20 in (508 mm) |
| Y-Axis Travel | ± 3 in (± 76 mm) |
| Z-Axis Travel | 44 in (1,118 mm) |
| Rapid Traverse X | 472 ipm (12 m/min) |
| Rapid Traverse Y | 472 ipm (12 m/min) |
| Rapid Traverse Z | 710 ipm |
| 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 | A1-20 Front & Rear |
| Spindle Drive | 2-Speed Gearbox |
| Spindle Motor Power | 55 hp (41 kW) |
| Max Spindle Speed | 1,000 rpm |
| Spindle Torque | 4,250 ft-lbf @ 30 rpm (5,762 N·m @ 30 rpm) |
| Spindle Bore | 12.5 in (318 mm) |
| C Axis Speed | 49 rpm |
| C Axis Max Rating | 5 hp (3.7 kW) |
| C Axis Positioning | 0.01 ° |
| C Axis Brake Holding Torque | 450 ft-lbf (610 N·m) |
| C Axis Control Type | Interpolated Motion and Positioning |
| Tailstock Taper | MT6 |
| Tailstock Travel | 42 in (1,067 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 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, 105 A |
| Electrical Service (high voltage) | 440 VAC 3-phase, 53 A |
Specifications sourced from haascnc.com — verified 2026-10-02
Strengths & Limitations
Strengths
- Y axis (± 3 in / ± 76 mm), C axis and 4,000 rpm BMT75 live tooling on a 12.5 in (318 mm) bore lathe
- 4,250 ft-lbf (5,762 N·m) at 30 rpm from a 55 hp (41 kW) spindle with a 2-speed gearbox
- A1-20 spindle nose front and rear, for holding long tube at both ends
- C axis positions to 0.01° and interpolates; brake holding torque is 450 ft-lbf (610 N·m)
- 44 in (1,118 mm) of Z travel with an MT6 tailstock that travels 42 in (1,067 mm)
Limitations
- Main spindle stops at 1,000 rpm; the ST-40LY reaches 2,400 rpm
- The C-axis brake holds 450 ft-lbf (610 N·m), far below the 4,250 ft-lbf (5,762 N·m) the spindle delivers when turning
- No chuck size or bar capacity in the table; workholding has to be defined with Haas
- Y travel of ± 3 in (± 76 mm) covers only the middle of a 27.5 in (699 mm) part
- Draws 105 A at 220 VAC or 53 A at 440 VAC
Best For
Frequently Asked Questions
01
Live tools on BMT75 tooling run to 4,000 rpm, with ± 3 in (± 76 mm) of Y travel and 2,300 lbf (10,231 N) of Y thrust. The C axis is listed for interpolated motion and positioning, at 0.01° and up to 49 rpm, with a 5 hp (3.7 kW) maximum rating. The C-axis brake holds 450 ft-lbf (610 N·m).
02
A 55 hp (41 kW) spindle with a 2-speed gearbox, 4,250 ft-lbf (5,762 N·m) at 30 rpm and a 1,000 rpm maximum. The bore is 12.5 in (318 mm) and the nose is A1-20, front and rear. Chuck size and bar capacity are not in the table, so check the through-hole of whatever workholding is quoted.
03
The Y-axis figures are the same on both: ± 3 in (± 76 mm) of travel, 472 ipm (12 m/min) X and Y rapids, 4,000 rpm live tools and a 27.5 in (699 mm) turning diameter. The ST-40LY has a 4.62 in (117.3 mm) bore, 40 hp (29.8 kW), 2,400 rpm and 80 in (2,032 mm) of Z. The ST-55SY has a 12.5 in (318 mm) bore, 55 hp (41 kW), 1,000 rpm and 44 in (1,118 mm) of Z.
04
X and Y rapid at 472 ipm (12 m/min); the Z rapid is 710 ipm. Maximum thrust is 5,500 lbf (24,465 N) on X, 2,300 lbf (10,231 N) on Y and 9,000 lbf (40,034 N) on Z. Travels are 20 in (508 mm) in X, ± 3 in (± 76 mm) in Y and 44 in (1,118 mm) in Z.
05
Electrical supply is 220 VAC three-phase at 105 A or 440 VAC three-phase at 53 A. Air is 4 scfm at 100 psi (113 L/min at 6.9 bar), with 80 psi (5.5 bar) as the minimum pressure and a 3/8 in hose and coupler. Coolant capacity is 95 gal (360 L).
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