Haas ST-20
Image: haascnc.com, Haas Automation
Key Specifications
X Travel
Z Travel
Max Spindle
Rapid Traverse
Spindle Power
Max Turn Length
How much does the Haas ST-20 cost?
Manufacturer list price
As published by Haas Automation, verified 2026-10-02. Options, tooling, freight and installation are extra.
Overview
The Haas ST-20 is a two-axis turning center with an 8.3 in (210 mm) chuck, 2.5 in (64 mm) of bar capacity, a 13 in (330 mm) maximum turning diameter and 22.5 in (572 mm) of turning length. The 20 hp (14.9 kW) belt-driven spindle runs to 4,000 rpm and produces 150 ft-lbf (203 N·m) at 500 rpm.
Haas describes the current ST-20 as a redesign: new castings that are more compact and more rigid, an 11% smaller footprint than its predecessor, a larger spindle bore for more bar capacity, more Z travel, an increased wedge angle and better part-loading ergonomics. Those are the maker's own statements about the change from the earlier machine, and the table has no figures for the old one to measure them against. What the table does give is a 3.5 in (88.9 mm) bore on an A2-6 nose and a 21 in (533 mm) swing.
Sort the equipment into what is included and what is not before comparing quotes. WiFi is standard. The sub-spindle, the two-stage automatic parts catcher, the automatic parts loader and the new-design tailstock are all listed as options. The sub-spindle rows in the table (5.3 in chuck, A2-5 nose, 6,000 rpm, 4,800 rpm synchronised with the main spindle) therefore describe an extra-cost configuration, and the table has no tailstock figures at all.
In the cut, Z has the heavier drive: 5,100 lbf (22,686 N) of thrust against 4,100 lbf (18,238 N) on X, with both axes at 945 ipm (24 m/min) in rapid. The turret has 12 stations, accepts OD and ID tools in any combination and leaves 4 in (102 mm) behind it for boring bars. Turret style moves the diameter limit: 11.75 in (298 mm) with a BMT65 turret and 11.8 in (300 mm) with a VDI turret.
Within the family, the ST-20L extends turning length to 42.5 in (1,080 mm), the ST-20Y adds ± 2 in (± 51 mm) of Y with live tools at 4,000 rpm, and the ST-25 keeps this envelope but carries a 10 in (254 mm) chuck, 3 in (76 mm) of bar capacity and 30 hp (22.4 kW). The ST-20 ships at 8,820 lb (4,000 kg), holds 55 gal (208 L) of coolant, and Haas lists a starting price of US$77,995.
Full Specifications
| Parameter | Value |
|---|---|
| Chuck Size | 8.3 in (210 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 | 2.5 in (64 mm) |
| X-Axis Travel | 8.4 in (213 mm) |
| Z-Axis Travel | 22.5 in (572 mm) |
| Rapid Traverse Rate | 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 | A2-6 |
| Spindle Drive | Direct Speed, Belt Drive |
| Spindle Motor Power | 20 hp (14.9 kW) |
| Max Spindle Speed | 4,000 rpm |
| Spindle Torque | 150 ft-lbf @ 500 rpm (203 N·m @ 500 rpm) |
| Spindle Bore | 3.5 in (88.9 mm) |
| Sub Spindle Chuck Size | 5.3 in |
| Sub Spindle Nose | A2-5 |
| Sub Spindle Speed | 6,000 rpm |
| Sub Spindle Max Sync Speed with Main Spindle | 4,800 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 |
| 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 Service (low voltage) | 220 VAC 3-phase, 40 A |
| Electrical Service (high voltage) | 440 VAC 3-phase, 20 A |
| Shipping Domestic Pallet | 142.5 × 90 × 92 in (362 × 229 × 234 cm) |
| Shipping Export Pallet | 142.5 × 90 × 92 in (362 × 229 × 234 cm) |
| Machine Weight | 8,820 lb (4,000 kg) |
Specifications sourced from haascnc.com — verified 2026-10-02
Strengths & Limitations
Strengths
- 2.5 in (64 mm) bar capacity through a 3.5 in (88.9 mm) spindle bore
- 13 in (330 mm) maximum turning diameter and 21 in (533 mm) swing with 22.5 in (572 mm) of Z travel
- WiFi is standard, according to Haas's feature list
- Z thrust of 5,100 lbf (22,686 N), about 24% more than X
- 4 in (102 mm) of boring-bar clearance behind the 12-station turret
- Haas states new, more rigid castings and an 11% smaller footprint than its predecessor
Limitations
- Sub-spindle, two-stage parts catcher, automatic parts loader and tailstock are options, not part of the base machine
- 150 ft-lbf (203 N·m) of torque is half the 300 ft-lbf (407 N·m) of the ST-25, which has the same travels
- A BMT65 turret reduces maximum turning diameter to 11.75 in (298 mm), a VDI turret to 11.8 in (300 mm)
- No live tooling, C axis or Y axis; the ST-20Y is the model with ± 2 in (± 51 mm) of Y and 4,000 rpm live tools
- Turning length is 22.5 in (572 mm); longer shafts need the ST-20L at 42.5 in (1,080 mm)
Best For
Frequently Asked Questions
01
Haas's feature list marks the sub-spindle, the two-stage automatic parts catcher, the automatic parts loader and the new-design tailstock as optional. WiFi is listed as standard. Treat the sub-spindle figures in the spec table, such as the 5.3 in chuck and 6,000 rpm speed, as describing that option.
02
Same travels, bigger spindle package on the ST-25. Both have 8.4 in (213 mm) of X, 22.5 in (572 mm) of Z and a 13 in (330 mm) maximum turning diameter. The ST-20 has an 8.3 in (210 mm) chuck, 2.5 in (64 mm) of bar capacity and 20 hp (14.9 kW) at 4,000 rpm; the ST-25 has a 10 in (254 mm) chuck, 3 in (76 mm) of bar capacity and 30 hp (22.4 kW) at 3,400 rpm.
03
Haas lists new castings that are more compact and more rigid, an 11% smaller footprint than the predecessor, a larger spindle bore for increased bar capacity, increased Z-axis travel, an increased wedge angle and improved part-loading ergonomics. The current table shows a 3.5 in (88.9 mm) bore, 2.5 in (64 mm) of bar capacity and 22.5 in (572 mm) of Z.
04
Up to 13 in (330 mm) in diameter and 22.5 in (572 mm) long, under a 21 in (533 mm) swing. With a BMT65 turret the diameter limit is 11.75 in (298 mm) and with a VDI turret 11.8 in (300 mm). X travel is 8.4 in (213 mm).
05
Electrical supply is 220 VAC three-phase at 40 A or 440 VAC three-phase at 20 A. Air is 4 scfm at 100 psi (113 L/min at 6.9 bar), with 80 psi (5.5 bar) the minimum, on a 3/8 in hose and coupler. It ships at 8,820 lb (4,000 kg) on a 142.5 × 90 × 92 in (362 × 229 × 234 cm) pallet.
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