Haas Automation CNC Lathes / Turning Centers

Haas ST-28Y

List US$134,995 Specs verified 2026-10-02 · haascnc.com Updated 2026-10-02

Image: haascnc.com, Haas Automation

Key Specifications

X Travel

9.4 in (239 mm)

Y Travel

± 2 in (± 51 mm)

Z Travel

22.5 in (572 mm)

Max Spindle

3,200 rpm

Spindle Power

40 hp (29.8 kW)

Max Turn Length

22.5 in (572 mm)

How much does the Haas ST-28Y cost?

Manufacturer list price

US$134,995

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

Overview

The Haas ST-28Y is a big-bore turning centre with a Y axis and a sub spindle. The main spindle carries a 305 mm (12.0 in) chuck on an A2-8 nose, with a 117.3 mm (4.62 in) bore and 102 mm (4.00 in) bar capacity. That bore is the specification that defines the machine: pipe, tube and heavy bar pass through the headstock rather than hanging out the back on a support.

Spindle power is 29.8 kW (40.0 hp) with a 3,200 rpm maximum and 576.0 Nm (425.0 ft-lbf) at 325 rpm through a belt drive. High torque at low speed is the correct shape for a 12-inch chuck — the machine is set up to take a heavy cut on large-diameter steel and cast iron, not to spin small parts fast. Maximum part swing is 533 mm (21.0 in), but maximum cutting diameter is 298 mm (11.75 in) with the BMT65 turret fitted, over 572 mm (22.5 in) of cutting length. That gap between swing and cutting diameter is turret clearance, and it is the detail most likely to catch someone out when quoting large flange work.

Y-axis travel is ±51 mm (±2.0 in) about the centreline, with 239 mm (9.40 in) on X and 572 mm (22.50 in) on Z. That is enough Y for off-centre milling, flats, slots and bolt circles, not enough to treat the lathe as a machining centre. The 12-station BMT65 turret drives live tooling to 4,000 rpm, and the C axis positions to ±0.01° with 3.7 kW (5.0 hp), 60 rpm maximum, and a 339 Nm (250 ft-lbf) brake holding torque on a 353 mm (13.9 in) brake disc. That brake figure is what actually limits how aggressively you can mill off-centre.

The sub spindle takes a 135 mm (5.3 in) chuck on an A2-5 nose with a 38.1 mm (1.50 in) bore and runs to 6,000 rpm, so back-end work happens in-cycle. Rapids are 12.0 m/min (472 ipm) on X and Y and 24.0 m/min (945 ipm) on Z, with 102.0 mm (4.00 in) of rear clearance for boring bars.

The machine weighs 4,926 kg (10,860 lb), holds 208 L (55 gal) of coolant and runs on 220 VAC three-phase at 70 A or 440 VAC at 35 A. It suits shops turning large-diameter or tubular stock that also need secondary milling — oilfield components, flanges, couplings and heavy fittings.

Full Specifications

Parameter	Value
Chuck Size	12 in (305 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	4 in (102 mm)
X-Axis Travel	9.4 in (239 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	A2-8
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)
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	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
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, 70 A
Electrical Service (high voltage)	440 VAC 3-phase, 35 A
Shipping Domestic Pallet	142 × 90 × 92 in (361 × 229 × 234 cm)
Shipping Export Pallet	143 × 90 × 92 in (364 × 229 × 234 cm)
Machine Weight	10,860 lb (4,926 kg)

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

Strengths & Limitations

Strengths

A 117.3 mm (4.62 in) spindle bore with 102 mm (4.00 in) bar capacity lets pipe, tube and heavy bar pass through the headstock rather than hang out the back on a support
576.0 Nm (425.0 ft-lbf) at 325 rpm from a 29.8 kW (40.0 hp) spindle is the right shape for a 305 mm (12.0 in) chuck - heavy cuts on large-diameter steel and cast iron
The sub spindle carries a 135 mm (5.3 in) chuck on an A2-5 nose and runs to 6,000 rpm, so back-end work happens in-cycle
Y travel of ±51 mm (±2.0 in) with a C axis positioning to ±0.01° gives real off-centre milling - flats, slots and bolt circles - beyond what a plain turret can do
The 12-station BMT65 turret drives live tooling to 4,000 rpm and leaves 102.0 mm (4.00 in) of rear clearance for boring bars
Axis thrust of 22,686 N (5,100 lbf) on Z and 18,238 N (4,100 lbf) on X supports the heavy feeds the spindle torque invites

Limitations

Maximum cutting diameter is 298 mm (11.75 in) with the BMT65 turret fitted, well under the 533 mm (21.0 in) maximum part swing - that turret-clearance gap catches people out when quoting large flange work
Spindle speed tops out at 3,200 rpm, which limits surface speed on small-diameter work and aluminium finishing
The C-axis drive is 3.7 kW (5.0 hp) with a 339 Nm (250 ft-lbf) brake, and that brake figure - not the live-tool speed - is what really limits how aggressively you can mill off-centre
Y travel is only ±51 mm (±2.0 in) about the centreline: enough for off-centre features, not enough to treat the lathe as a machining centre
Sub-spindle bore is 38.1 mm (1.50 in) against 117.3 mm on the main spindle, so back-end work is confined to much smaller stock

Best For

Shops turning large-diameter or tubular stock that also need secondary milling Oil and gas components run from pipe and heavy bar straight through the spindle Flanges, couplings and heavy fittings needing off-centre features Bar-fed production up to 102 mm (4.00 in) diameter Heavy production turning in steel, stainless and cast iron where low-speed torque matters more than rpm Parts that would otherwise need a lathe operation followed by a separate mill setup

Frequently Asked Questions

01 How large a part can the ST-28Y actually cut?

Maximum part swing is 533 mm (21.0 in), but maximum cutting diameter is 298 mm (11.75 in) with the BMT65 turret fitted, over 572 mm (22.5 in) of cutting length. The gap between those two figures is turret clearance, and it is the detail most likely to catch someone out when quoting large flange work. Quote against the cutting diameter, not the swing.

02 What bar and tube will pass through the spindle?

The main spindle bore is 117.3 mm (4.62 in), with a rated bar capacity of 102 mm (4.00 in), on an A2-8 nose carrying a 305 mm (12.0 in) chuck. That bore is the specification that defines the machine: pipe, tube and heavy bar pass through the headstock rather than hanging out the back on a support.

03 How much milling can the Y axis and turret do?

Y travel is ±51 mm (±2.0 in) about the centreline, and the 12-station BMT65 turret drives live tooling to 4,000 rpm. The C axis positions to ±0.01° with a 3.7 kW (5.0 hp) drive, 60 rpm maximum, and a 339 Nm (250 ft-lbf) brake on a 353 mm (13.9 in) disc. That brake torque is the real limit on how hard you can mill off-centre, not the live-tool speed.

04 What does the sub spindle add?

It carries a 135 mm (5.3 in) chuck on an A2-5 nose with a 38.1 mm (1.50 in) bore and runs to 6,000 rpm, so back-end work happens in-cycle rather than as a second setup. Note the bore difference - 38.1 mm against 117.3 mm on the main spindle - which confines the second operation to much smaller stock than the first.

05 What services does the ST-28Y need?

Either 220 VAC three-phase at 70 A or 440 VAC three-phase at 35 A, plus 113.0 L/min of air at 6.9 bar (4 scfm at 100 psi) with a 5.5 bar (80 psi) minimum supply pressure. The machine weighs 4,926 kg (10,860 lb) and holds 208 L (55 gal) of coolant.