The Haas Automation ST-55SY is an industrial-grade CNC Lathes & Turning Centers powered by the Standard CNC. a top spindle speed of 1,000 RPM, and a 3-axis kinematic layout. It supports standardized digital factory monitoring via MTConnect.
Haas ST-55SY: Y-axis big-bore lathe with a 12.5 in (318 mm) spindle bore, 4,000 rpm BMT75 live tools, ± 3 in Y travel and 44 in of Z travel.
| Standardized Parameters & Ratings | |
|---|---|
| Manufacturer (Brand) | Haas Automation (United States) |
| Machine Type | CNC Lathes & Turning Centers |
| CNC Controller System | Standard CNC |
| Number of Controlled Axes | 3-Axis Simultaneous / Positioning |
| Maximum Spindle Speed | 1,000 RPM |
| Spindle Motor Rating | 55.0 kW |
| Spindle Taper Interface | Standard |
| Industrial IoT Protocol | MTConnect ANSI/MTC1.4 Compliant (Ethernet/TCP) |
| 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 Low | 220 VAC 3-phase, 105 A |
| Electrical High | 440 VAC 3-phase, 53 A |
Haas Automation publishes a list price of US$396,995 for the Haas ST-55SY (verified 2026-10-02). Options, tooling, freight and installation are extra, so a dealer quote will differ. A specific price can be requested at https://machinetoolindex.com/machines/haas-st-55sy#price; the request is passed to Haas Automation or an authorised dealer.
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).
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.
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.
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.
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).
