Haas Automation CNC Lathes / Turning Centers

Haas ST-20Y

List US$114,995 Specs verified 2026-10-02 · haascnc.com Updated 2026-10-02

Key Specifications

X Travel

8.4 in (213 mm)

Y Travel

± 2 in (± 51 mm)

Z Travel

22.5 in (572 mm)

Max Spindle

4,000 rpm

Spindle Power

20 hp (14.9 kW)

Max Turn Length

22.5 in (572 mm)

How much does the Haas ST-20Y cost?

Manufacturer list price

US$114,995

As published by Haas Automation, verified 2026-10-02. Options, tooling, freight and installation are extra.

Overview

The Haas ST-20Y is the short-bed Y-axis lathe of the ST-20 family: an 8.3 in (210 mm) chuck, 11.75 in (298 mm) maximum turning diameter and 22.5 in (572 mm) of turning length, with ± 2 in (± 51 mm) of Y travel and BMT65 live tools at up to 4,000 rpm. Haas lists a starting price of US$114,995.

This is the redesigned generation. Haas's feature list cites new castings that are more compact and more rigid, an 11% smaller footprint than its predecessor, a larger spindle bore for more bar capacity, and more Z travel. In the table that reads as a 3.5 in (88.9 mm) bore taking 2.5 in (64 mm) bar through an A2-6 nose. WiFi is standard.

What turns it from a turn-mill lathe into a one-setup machine sits on the options list. The sub-spindle is optional: a 5.3 in (135 mm) chuck on an A2-5 nose, 6,000 rpm, a 1.5 in (38.1 mm) bore, orientation to ± 0.02° and its own 400 ipm (10 m/min) rapids. The small chuck and bore say what it is for, which is picking off bar-sized parts to finish the cut-off face. A two-stage parts catcher, an automatic parts loader and a tailstock of a new design are also options. Put the ones your parts need on the quote; none of them is part of the base machine.

The main spindle is 20 hp (14.9 kW) with 150 ft-lbf (203 N·m) at 500 rpm and 4,000 rpm at the top. Its C axis interpolates as well as positions, to 0.01° at up to 60 rpm, and the brake holds 250 ft-lbf (339 N·m). Rapids are 945 ipm (24 m/min) on Z and 472 ipm (12 m/min) on X and Y. At 10,480 lb (4,754 kg) it is the lighter of the two Y-axis machines in the family; the long-bed ST-20LY weighs 12,360 lb (5,606 kg).

Full Specifications

Parameter	Value
Chuck Size	8.3 in (210 mm)
Max Swing	21 in (533 mm)
Max Turning Diameter	11.75 in (298 mm)
Max Turning Length	22.5 in (572 mm)
Bar Capacity	2.5 in (64 mm)
X-Axis Travel	8.4 in (213 mm)
Y-Axis Travel	± 2 in (± 51 mm)
Z-Axis Travel	22.5 in (572 mm)
Rapid Traverse X	472 ipm (12 m/min)
Rapid Traverse Y	472 ipm (12 m/min)
Rapid Traverse Z	945 ipm (24 m/min)
Max Thrust X	4,100 lbf (18,238 N)
Max Thrust Y	2,300 lbf (10,231 N)
Max Thrust Z	5,100 lbf (22,686 N)
Spindle Nose	A2-6
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)
C Axis Max Rating	5 hp (3.7 kW)
C Axis Speed	60 rpm
C Axis Positioning	0.01 °
C Axis Brake Diameter	13.9 in (353 mm)
C Axis Brake Holding Torque	250 ft-lbf (339 N·m)
C Axis Control Type	Interpolated Motion and Positioning
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	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 × 1.5 in 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)
Live Tool Speed	4,000 rpm
Live Tooling	BMT65
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	143 × 90 × 92 in (363 × 229 × 234 cm)
Shipping Export Pallet	143 × 90 × 92 in (364 × 229 × 234 cm)
Machine Weight	10,480 lb (4,754 kg)

Specifications sourced from haascnc.com — verified 2026-10-02

Strengths & Limitations

Strengths

Y axis of ± 2 in (± 51 mm), interpolating C axis and 4,000 rpm BMT65 live tools in a 12-station turret
Optional sub-spindle with a 5.3 in (135 mm) chuck and 6,000 rpm for back-side work in the same cycle
3.5 in (88.9 mm) spindle bore passes 2.5 in (64 mm) bar
Redesigned castings that Haas describes as more compact and more rigid, with an 11% smaller footprint than the predecessor
Options for unattended running: two-stage parts catcher and automatic parts loader
WiFi connectivity is standard on this model

Limitations

The sub-spindle, parts catcher, parts loader and tailstock are all extra-cost options
Turning length is 22.5 in (572 mm); the ST-20LY reaches 42.5 in (1,080 mm)
The optional sub-spindle's bore is 1.5 in (38.1 mm) against 2.5 in (64 mm) of main bar capacity, so long parts above that diameter cannot slide into it
X and Y rapids of 472 ipm (12 m/min) are half the Z rate
Maximum turning diameter is 11.75 in (298 mm), where the two-axis ST-20 turns 13 in (330 mm)

Best For

Bar-fed turn-mill parts up to 2.5 in (64 mm) Done-in-one parts when the optional sub-spindle is fitted Chucked parts with milled flats, slots and cross holes Unattended runs with the optional parts catcher or parts loader

Frequently Asked Questions

01 Is the sub-spindle standard on the ST-20Y?

No. Haas lists it as an option. The sub-spindle rows in the table describe a 5.3 in (135 mm) chuck on an A2-5 nose, a top speed of 6,000 rpm, a 1.5 in (38.1 mm) spindle bore, a 17 ft-lbf (23 N·m) integrated brake, orientation accuracy of ± 0.02° and rapids of 400 ipm (10 m/min).

02 What is new on this generation of the ST-20Y?

Haas's feature list names 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. WiFi is standard. The table shows the result as a 3.5 in (88.9 mm) bore and 22.5 in (572 mm) of Z.

03 How does the ST-20Y differ from the ST-20?

The ST-20 is a two-axis lathe that turns 13 in (330 mm) in diameter and rapids at 945 ipm (24 m/min). The ST-20Y adds a Y axis, a C axis and live tools, turns 11.75 in (298 mm), and its X and Y rapids are 472 ipm (12 m/min). Chuck, bar capacity, spindle power and turning length are the same on both.

04 What live tooling does the ST-20Y take?

BMT65 tooling, driven at up to 4,000 rpm. The turret has 12 stations and Haas lists OD and ID tools in any combination, depending on the turret. There is 4 in (102 mm) of clearance behind the turret for boring bars. Y-axis thrust is 2,300 lbf (10,231 N).

05 What does the ST-20Y weigh, and what services does it need?

It weighs 10,480 lb (4,754 kg) and ships on a pallet of 143 × 90 × 92 in. Power is 220 VAC three-phase at 40 A or 440 VAC at 20 A. Air is 4 scfm at 100 psi (113 L/min at 6.9 bar), with 80 psi (5.5 bar) as the minimum, and the coolant tank holds 55 gal (208 L).