CNC Lathe with 15" x 21" max capacity and 2" bar capacity
  • 8.3" Chuck Size
  • 2.0" Bar Capacity
  • 4k RPM
  • 20 hp Power
7.5 %
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The Haas ST Series high-performance turning centers were designed from the ground up to provide setup flexibility, extreme rigidity, and high thermal stability.

The ST-20 has a small footprint, yet provides a generous work envelope. This machine offers the best performance for the money – the best value – in its class.

  • Small footprint
  • Generous work envelope
  • Ideal for high-volume, high-production environments
  • Made in the USA

Standard Features


  • 4000-rpm Spindle

Turrets & Live Tooling

  • 12-Station VDI Tool Turret
  • 12-Station Bolt-On Tool Turret

Chip & Coolant Management

  • 55-Gallon Coolant Tank

The Haas Control

  • Media Display M-Code; M130
  • HaasConnect: Remote monitoring
  • Early Power-Failure Detection Module
  • Ethernet Interface
  • Rigid Tapping
  • Standard Program Memory, 1 GB
  • Internal High-Voltage Isolated Transformer

Tooling & Fixturing

  • Bolt-On Toolholder Kit, 1"


  • 8.3" Hydraulic Chuck, A2-6


  • Lifting Kit


  • 1-Year Standard Warranty
Swing Diameter S.A.E METRIC
Over Front Apron 31.8 in 806 mm
Over Cross Slide 20.8 in 527 mm
Over Tailstock 23.0 in 584 mm
Capacities S.A.E METRIC
Chuck Size 8.3 in 210 mm
Max Cutting Diameter (varies with turret) 15.0 in 381 mm
Max Cutting Length (without workholding) 21 in 533 mm
Bar Capacity 2.00 in 51 mm
Travels S.A.E METRIC
X Axis 9.3 in 236 mm
Z Axis 21.0 in 533 mm
Feedrates S.A.E METRIC
Rapids on X 945 ipm 24.0 m/min
Rapids on Z 945 ipm 24.0 m/min
Axis Motors S.A.E METRIC
Max Thrust X 4100 lbf 18238 N
Max Thrust Z 5100 lbf 22686 N
Spindle S.A.E METRIC
Spindle Nose A2-6 A2-6
Drive System Direct Speed, Belt Drive Direct Speed, Belt Drive
Max Rating 20.0 hp 14.9 kW
Max Speed 4000 rpm 4000 rpm
Max Torque 150 ft-lbf @ 500 rpm 203 Nm @ 500 rpm
Spindle Bore ø 3.50 in 88.9 mm
Number of Tools 12 Stations 12 Stations
OD vs ID Tools Any Combination (will vary with turret) Any Combination (will vary with turret)
Boring Bar Rear Clearance (from back of turret ) 4.00 in 102.0 mm
General S.A.E METRIC
Coolant Capacity 55 gal 208 L
Air Requirements S.A.E METRIC
Air Required 4 scfm @ 100 psi 113 L/min @ 6.9 bar
Inline Air Hose 3/8 in 3/8 in
Coupler (Air) 3/8 in 3/8 in
Air Pressure Min 80 psi 5.5 bar
Electrical Specification S.A.E METRIC
Spindle Speed 4000 rpm 4000 rpm
Drive System Direct Speed, Belt Drive Direct Speed, Belt Drive
Spindle Power 20.0 hp 14.9 kW
Input AC Voltage (3 Phase) - Low 220 VAC 220 VAC
Full Load Amps (3 Phase) - Low 40 A 40 A
Input AC Voltage (3 Phase) - High 440 VAC 440 VAC
Full Load Amps (3 Phase) - High 20 A 20 A

Talk to Us

If you would like more information about how a new Haas machine can bring your products to life, please share your contact information.

See the ST Series in Action

Mark shows you everything you need to know to drill on a Haas lathe. Whether you have a standard 2-axis lathe, a dual-spindle lathe, or even a live-tool lathe, Mark simplifies the process, and explains all the G and M codes you’ll ever need.
Mark demonstrates how using a G53 command instead of G28 not only saves valuable cycle time, but also reduces the risk of crashing your machine. Mark walks you through both G-codes, and explains how and when to use each one.
Why move your turned parts to a mill for secondary operations when you can machine them complete on a Haas lathe with the BMT65 turret and live tooling? The BMT65 system provides increased cutting performance, longer tool life, and better tool clearance.
Setting Up Live Tools
Properly setting up live tools on a turning center can be tricky. Mark guides you through the process with a step-by-step tutorial that will answer all your questions.

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All prices and specifications subject to change without notice. Freight, rigging, state & local taxes, vendor installation charges, and dealer installed accessories are not included. Not responsible for misprints or typographical errors. Machines shown with optional equipment. Actual product appearance may differ.