Haas Automation CNC Lathes / Turning Centers

Haas ST-28

List US$88,995 Specs verified 2026-10-02 · haascnc.com Updated 2026-10-02

Image: haascnc.com, Haas Automation

Key Specifications

X Travel

8.4 in (213 mm)

Z Travel

22.5 in (572 mm)

Max Spindle

3,200 rpm

Rapid Traverse

945 ipm (24 m/min)

Spindle Power

40 hp (29.8 kW)

Max Turn Length

22.5 in (572 mm)

How much does the Haas ST-28 cost?

Manufacturer list price

US$88,995

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

Overview

The Haas ST-28 is a big-bore lathe on a compact envelope: a 12 in (305 mm) chuck, 4 in (102 mm) of bar capacity through a 4.62 in (117.3 mm) spindle bore, and 40 hp (29.8 kW) on an A2-8 nose. It turns up to 13 in (330 mm) in diameter and 22.5 in (572 mm) in length.

That is a large spindle for the travels. X travel is 8.4 in (213 mm) and swing is 21 in (533 mm), the same as on the ST-20, which has an 8.3 in (210 mm) chuck, an A2-6 nose and 2.5 in (64 mm) of bar capacity. So this is a machine for thick bar and tube cut into short parts, not for larger-diameter chuck work. The chuck is nearly as large as the maximum turning diameter, and the table quotes smaller diameters with other turrets: 11.75 in (298 mm) with a BMT65 turret and 11.8 in (300 mm) with a VDI turret, both less than the chuck itself.

Torque is the other reason to choose it. The spindle delivers 425 ft-lbf (576 N·m) at 325 rpm and runs to 3,200 rpm. The ST-20 makes 150 ft-lbf (203 N·m) at 500 rpm and reaches 4,000 rpm. Low speed and high torque fit 4 in bar, where surface speed is reached at a few hundred rpm.

The turret is a 12-station BOT type holding any combination of OD and ID tools, with 4 in (102 mm) of clearance behind it for boring bars. The table also carries a full set of sub-spindle rows: a 5.3 in (135 mm) chuck on an A2-5 nose, 6,000 rpm, synchronised running up to 3,200 rpm and a 1.5 in (38.1 mm) bore. It does not say whether that sub-spindle is part of the base machine, so confirm it on the quote. A bore that small also means the sub-spindle grips a part in its chuck and cannot swallow a long one.

The ST-28 weighs 10,240 lb (4,645 kg) and draws 70 A at 220 VAC three-phase or 35 A at 440 VAC. Haas lists a starting price of US$88,995.

Full Specifications

Parameter	Value
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 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	A2-8
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 Service (low voltage)	220 VAC 3-phase, 70 A
Electrical Service (high voltage)	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)

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

Strengths & Limitations

Strengths

4 in (102 mm) of bar capacity through a 4.62 in (117.3 mm) bore
425 ft-lbf (576 N·m) at 325 rpm from a 40 hp (29.8 kW) spindle
12 in (305 mm) chuck on an A2-8 spindle nose
Sub-spindle rows in the table show synchronised running up to the main spindle's 3,200 rpm maximum
Compact for its bore: 10,240 lb (4,645 kg) on a 143 × 90 × 92 in pallet

Limitations

A 3,200 rpm top speed restricts surface speed on small diameters
Turning length is 22.5 in (572 mm) and X travel 8.4 in (213 mm), the same as the smaller-bore ST-20
With a BMT65 or VDI turret the turning diameter, 11.75 in (298 mm) or 11.8 in (300 mm), is below the 12 in (305 mm) chuck size
No live tooling, C axis or Y axis is in the table for this model
The table does not state whether the sub-spindle is standard, and its bore is only 1.5 in (38.1 mm)

Best For

Bar and tube up to 4 in (102 mm) in diameter Short large-bore parts: couplings, bushings, flanges Heavy roughing in steel at 425 ft-lbf (576 N·m) Chuck work up to 13 in (330 mm) in diameter and 22.5 in (572 mm) long

Frequently Asked Questions

01 What bar size can the ST-28 take?

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.

02 How does the ST-28 compare with the ST-20?

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).

03 Does the ST-28 come with a sub-spindle?

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.

04 What is the maximum turning diameter with each turret?

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.

05 What power supply and air does the ST-28 need?

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).