Haas ST-20L
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-20L cost?
Manufacturer list price
As published by Haas Automation, verified 2026-10-02. Options, tooling, freight and installation are extra.
Overview
The Haas ST-20L is the long-bed version of the ST-20: a two-axis turning center with an 8.3 in (210 mm) chuck, 42.5 in (1,080 mm) of Z travel and turning length, and a 20 hp (14.9 kW) spindle that tops out at 4,000 rpm. The cross-section of the work stays as it is on the shorter machine. What changes is how long a part can be.
The ST-20 stops at 22.5 in (572 mm) of turning length, and this machine nearly doubles that on the same 13 in (330 mm) maximum turning diameter and 8.4 in (213 mm) of X travel. A part at full length is more than three times as long as the largest diameter the turret can cut, which is shaft territory: rolls, long pins, rods, spindles. The table has no tailstock or steady-rest row, so ask Haas what part support the quoted machine carries before planning slender work at that length.
The spindle has an A2-6 nose, a 3.5 in (88.9 mm) bore and 2.5 in (64 mm) of bar capacity. Haas gives the drive as direct speed, belt drive, and peak torque is 150 ft-lbf (203 N·m) at 500 rpm. That is enough for steel in the diameters the bar capacity implies. For heavier roughing on bigger stock the ST-25 puts 30 hp (22.4 kW) and 300 ft-lbf (407 N·m) behind a 10 in (254 mm) chuck.
The 12-station turret takes OD and ID tools in any combination, with 4 in (102 mm) of clearance behind it for boring bars. Haas also quotes an 11.75 in (298 mm) maximum turning diameter with a BMT65 turret, so the turret style changes the diameter you can reach. Both axes rapid at 945 ipm (24 m/min). Thrust is 4,100 lbf (18,238 N) on X and 5,100 lbf (22,686 N) on Z, about 24% more along the axis that takes drilling loads.
The longer bed shows up at delivery. The machine travels on a 190 × 90 × 90 in (483 × 229 × 229 cm) pallet and weighs 11,520 lb, against 8,820 lb (4,000 kg) for the ST-20. Haas lists a starting price of US$103,995 for the base machine.
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 Length | 42.5 in (1,080 mm) |
| Bar Capacity | 2.5 in (64 mm) |
| X-Axis Travel | 8.4 in (213 mm) |
| Z-Axis Travel | 42.5 in (1,080 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) |
| 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 | 190 × 90 × 90 in (483 × 229 × 229 cm) |
| Shipping Export Pallet | 190 × 90 × 90 in (483 × 229 × 229 cm) |
| Machine Weight | 11,520 lb |
Specifications sourced from haascnc.com — verified 2026-10-02
Strengths & Limitations
Strengths
- 42.5 in (1,080 mm) of Z travel and turning length, against 22.5 in (572 mm) on the ST-20
- 3.5 in (88.9 mm) spindle bore with 2.5 in (64 mm) of bar capacity on an A2-6 nose
- 12-station turret accepts OD and ID tools in any combination, with 4 in (102 mm) of rear clearance for boring bars
- Z-axis thrust of 5,100 lbf (22,686 N) for drilling from the turret; X is rated 4,100 lbf (18,238 N)
- Runs from a 40 A supply at 220 VAC three-phase, or 20 A at 440 VAC
Limitations
- The table lists no live tooling, C axis or Y axis; for milled features the ST-20LY adds ± 2 in (± 51 mm) of Y and 4,000 rpm live tools
- 150 ft-lbf (203 N·m) of spindle torque is half the 300 ft-lbf (407 N·m) of the ST-25
- No tailstock or steady-rest row appears in the table, so support for long slender parts has to be confirmed with Haas
- With a BMT65 turret the maximum turning diameter drops from 13 in (330 mm) to 11.75 in (298 mm)
- Ships on a pallet 190 in (483 cm) long and weighs 11,520 lb, so check rigging access before delivery
Best For
Frequently Asked Questions
01
Maximum turning length and Z travel are both 42.5 in (1,080 mm), with a maximum turning diameter of 13 in (330 mm) and a swing of 21 in (533 mm). The spec table for this model does not list a tailstock or steady rest, so confirm with Haas how a part near full length will be supported.
02
Bed length. The ST-20 has 22.5 in (572 mm) of Z travel and weighs 8,820 lb (4,000 kg); the ST-20L has 42.5 in (1,080 mm) and weighs 11,520 lb. Chuck size, bar capacity, the 20 hp (14.9 kW) 4,000 rpm spindle, X travel and the 12-station turret are the same on both.
03
No. The table for the ST-20L gives X and Z only, with no live-tool, C-axis or Y-axis rows. The ST-20LY is the version of this bed length with ± 2 in (± 51 mm) of Y travel and live tools at 4,000 rpm, and its maximum turning diameter is 11.75 in (298 mm).
04
Bar capacity is 2.5 in (64 mm). The spindle bore itself is 3.5 in (88.9 mm) on an A2-6 nose, and the chuck is 8.3 in (210 mm). If you need more, the ST-25 is listed with 3 in (76 mm) of bar capacity through the same size of bore.
05
Electrical supply is 220 VAC three-phase at 40 A or 440 VAC three-phase at 20 A. Air consumption is 4 scfm at 100 psi (113 L/min at 6.9 bar), with a minimum supply pressure of 80 psi (5.5 bar) through a 3/8 in hose and coupler. The coolant tank holds 55 gal (208 L).
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