The Haas Automation ST-28 is an industrial-grade CNC Lathes & Turning Centers powered by the Standard CNC. a top spindle speed of 3,200 RPM, and a 3-axis kinematic layout. It supports standardized digital factory monitoring via MTConnect.
Haas ST-28: big-bore lathe with 12 in (305 mm) chuck, 4 in (102 mm) bar capacity, 40 hp and 425 ft-lbf at 325 rpm, 22.5 in turning length.
| 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 | 3,200 RPM |
| Spindle Motor Rating | 40.0 kW |
| Spindle Taper Interface | Standard |
| Approx. Machine Weight | 10,240 kg |
| Industrial IoT Protocol | MTConnect ANSI/MTC1.4 Compliant (Ethernet/TCP) |
| Chuck Size | 12 in (305 mm) |
| Max Swing | 21 in (533 mm) |
| Max Turning Diameter | 13 in (330 mm) |
| Max Turning Diameter With Bmt65 Turret | 11.75 in (298 mm) |
| Max Turning Diameter With Vdi Turret | 11.8 in (300 mm) |
| Max Turning Length | 22.5 in (572 mm) |
| Bar Capacity | 4 in (102 mm) |
| X-Axis Travel | 8.4 in (213 mm) |
| Z-Axis Travel | 22.5 in (572 mm) |
| Rapid Traverse | 945 ipm (24 m/min) |
| Max Thrust X | 4,100 lbf (18,238 N) |
| Max Thrust Z | 5,100 lbf (22,686 N) |
| Spindle Nose | A2-8 |
| Spindle Motor Power | 40 hp (29.8 kW) |
| Max Spindle Speed | 3,200 rpm |
| Spindle Torque | 425 ft-lbf @ 325 rpm (576 N·m @ 325 rpm) |
| Spindle Bore | 4.62 in (117.3 mm) |
| Sub Spindle Chuck Size | 5.3 in (135 mm) |
| Sub Spindle Nose | A2-5 |
| Sub Spindle Speed | 6,000 rpm |
| Sub Spindle Max Sync Speed With Main Spindle | 3,200 rpm |
| Sub Spindle Chuck Throat | Ø 1.3 in × 1.37 in DEEP (Ø 33 mm × 34.8 mm DEEP) |
| Sub Spindle Drawbar Bore | Ø 1 in × 4.5 in DEEP (Ø 25.4 mm × 114.3 mm DEEP) |
| Sub Spindle Spindle Bore | 1.5 in (38.1 mm) |
| Sub Spindle Integrated Brake Torque | 17 ft-lbf (23 N·m) |
| Sub Spindle Spindle Orientation Accuracy | ± 0.02 ° |
| Sub Spindle Rapids | 400 ipm (10 m/min) |
| Turret Stations | 12-Station BOT |
| Turret Od Vs Id Tools | Any Combination (will vary with turret) |
| Turret Boring Bar Rear Clearance | 4 in (102 mm) |
| Coolant Capacity | 55 gal (208 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, 70 A |
| Electrical High | 440 VAC 3-phase, 35 A |
| Shipping Domestic Pallet | 143 × 90 × 92 in (363 × 229 × 234 cm) |
| Shipping Export Pallet | 143 × 90 × 92 in (364 × 229 × 234 cm) |
| Machine Weight | 10,240 lb (4,645 kg) |
| Shipping Domestic Pallet With Conveyor | 143 × 90 × 92 in (363 × 229 × 234 cm) |
| Shipping Export Pallet With Conveyor | 143 × 90 × 92 in (363 × 229 × 234 cm) |
Haas Automation publishes a list price of US$88,995 for the Haas ST-28 (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-28#price; the request is passed to Haas Automation or an authorised dealer.
Bar capacity is 4 in (102 mm). The spindle bore is 4.62 in (117.3 mm) on an A2-8 nose, behind a 12 in (305 mm) chuck. Peak torque of 425 ft-lbf (576 N·m) arrives at 325 rpm, which is the speed range large bar is cut in, and the spindle tops out at 3,200 rpm.
The travels and the 13 in (330 mm) by 22.5 in (572 mm) turning envelope are the same. The ST-20 has an 8.3 in (210 mm) chuck, 2.5 in (64 mm) of bar capacity, 20 hp (14.9 kW) and 150 ft-lbf (203 N·m), and weighs 8,820 lb (4,000 kg). The ST-28 has a 12 in (305 mm) chuck, 4 in (102 mm) of bar capacity, 40 hp (29.8 kW) and 425 ft-lbf (576 N·m).
The table lists sub-spindle figures (5.3 in (135 mm) chuck, A2-5 nose, 6,000 rpm, 3,200 rpm synchronised, 17 ft-lbf (23 N·m) brake, 400 ipm (10 m/min) rapids) but does not say whether it is standard or optional on this model. Ask Haas which applies to the configuration you are quoted.
13 in (330 mm) as the table's main figure, where the turret is listed as a 12-station BOT type. With a BMT65 turret it is 11.75 in (298 mm) and with a VDI turret 11.8 in (300 mm). Both alternatives are smaller than the 12 in (305 mm) chuck, so check that against your largest part.
220 VAC three-phase at 70 A, or 440 VAC three-phase at 35 A. Air is 4 scfm at 100 psi (113 L/min at 6.9 bar) with a floor of 80 psi (5.5 bar), delivered through a 3/8 in hose and coupler. The coolant tank holds 55 gal (208 L).
