Haas ST-50

$150,000 - $200,000 Updated 2026-03-16

Key Specifications

Max Spindle

2,400 RPM

Tool Capacity

12-station BOT

Spindle Power

44.7 kW (60 hp)

max swing

813 mm (32 in)

max cutting diameter

648 mm (25.5 in)

max cutting length

1,016 mm (40 in)

Overview

The Haas ST-50 is the largest turning center in the Haas lineup, built for big parts and heavy cuts. With a 533 mm (21 in) chuck, 813 mm (32 in) max swing, and a 44.7 kW (60 hp) spindle producing 1,356 Nm (1,000 ft-lb) of torque, this machine handles workpieces that smaller Haas lathes simply cannot.

Max cutting diameter is 648 mm (25.5 in) with 1,016 mm (40 in) of Z-axis travel. The A2-11 spindle nose accepts large chucks and fixtures, and the 177.8 mm (7 in) bore through the spindle passes oversized bar stock that most mid-range lathes choke on. Max spindle speed is 2,400 RPM.

The 12-station BOT turret handles heavy-duty turning tools, and the machine's 9,072 kg (20,000 lb) weight provides the mass needed to damp vibration during aggressive roughing in steel, stainless, and cast iron. This is not a precision finishing machine — it's a material removal machine.

The NGC control runs the same interface as every other Haas, so operators moving from smaller ST machines will be immediately productive. The ST-50 doesn't have Y-axis or live tooling options — it's pure two-axis turning power.

At $150,000-$200,000 configured, the ST-50 dramatically undercuts large-frame turning centers from Mazak, Okuma, and Doosan that start at $250K+. For shops that need big-bore, high-torque turning without six-figure Japanese or Korean price tags, the ST-50 is hard to ignore.

Full Specifications

Parameter	Value
Max Swing	813 mm (32 in)
Max Cutting Diameter	648 mm (25.5 in)
Max Cutting Length	1,016 mm (40 in)
Max Spindle Speed	2,400 RPM
Spindle Motor Power	44.7 kW (60 hp)
Spindle Torque	1,356 Nm (1,000 ft-lb) @ 250 RPM
Spindle Nose	A2-11
Spindle Bore	177.8 mm (7 in)
Chuck Size	533 mm (21 in)
Bar Capacity	8.5"
X Axis Travel	356 mm (14 in)
Z Axis Travel	1,016 mm (40 in)
Rapid Traverse X	10.2 m/min (400 in/min)
Rapid Traverse Z	15.2 m/min (600 in/min)
Tool Capacity	12-station BOT
Coolant Capacity	416 L (110 gal)
Machine Weight	9,072 kg (20,000 lb)
CNC Control	Haas Next Generation Control (NGC)
Modelst 50brandhaastypecnc Lathescontrolcontact Sales Rep	Contact Sales Rep.
Modelst 50brandhaastypecnc Lathescontrol	Contact Sales Rep.
Model	ST-50
Brand	HAAS
Type	CNC Lathes
Bar Capacity85 Axis2power55 Hpmax Rpm1200 Rpm	Turning Dia25.5"Swing34.5"Machining Length80"ControlCNC (Haas Control)
Axis	2
Power	55 hp
Max Rpm	1,200 RPM
Turning Dia	25.5"
Swing Over Bed	34.5"
Machining Length	80"
Cnc Control	CNC (Haas Control)
Looking To Purchase A New Haas St 50	Contact Sales Rep.

Specifications sourced from machinetools.com — verified 2026-03-28

Strengths & Limitations

Strengths

1,356 Nm (1,000 ft-lb) of torque is massive for the price — handles aggressive roughing in steel and cast iron
533 mm (21 in) chuck and 177.8 mm (7 in) bore accommodate large-diameter chucking and bar work
9,072 kg machine weight provides vibration damping that lighter machines can't match
44.7 kW (60 hp) spindle removes material fast in heavy roughing applications
$50-100K cheaper than comparable Mazak or Okuma large-frame turning centers
Same NGC control as smaller Haas machines — no retraining needed

Limitations

No Y-axis or live tooling option — strictly two-axis turning, no mill-turn capability
2,400 RPM max spindle speed limits small-diameter finishing work and aluminum high-speed turning
BOT turret only — no BMT option means less tooling rigidity compared to newer platforms
Massive footprint and weight require significant floor space and potentially reinforced foundations
Slower rapids (10.2/15.2 m/min) compared to smaller machines increase non-cutting time on shorter parts

Best For

Large-diameter chucking work in steel, stainless, and cast iron up to 648 mm diameter Oil and gas component manufacturers turning large-bore pipe fittings and flanges Heavy equipment and agricultural shops producing axles, hubs, and spindle housings Shops needing big-bore turning capability without a $250K+ Japanese or Korean machine investment High-torque roughing applications where material removal rate matters more than surface finish

Frequently Asked Questions

01 What does a Haas ST-50 cost?

Base price is around $150,000. With tailstock, steady rest, chip conveyor, and high-pressure coolant, expect $175,000-$200,000 configured. Used ST-50 machines from 2018-2023 sell in the $70,000-$120,000 range depending on hours and condition.

02 How does the ST-50 compare to the Mazak QT-500?

The Mazak QT-500 offers similar swing and turning capacity with higher spindle speeds and optional milling capability, but starts at $250K+. The ST-50 delivers comparable roughing power at $50-100K less, making it the value choice for shops focused on two-axis turning rather than mill-turn work.

03 Can the ST-50 handle interrupted cuts on castings?

Yes. The 1,356 Nm of torque and 9,072 kg machine weight are specifically suited for interrupted cuts on castings and forgings. The mass damps vibration effectively. Use appropriate insert grades and manage feed rates for the best results on heavy interrupted work.

04 What are the foundation requirements for an ST-50?

At 9,072 kg (20,000 lb), the ST-50 requires a reinforced concrete floor typically 200-300 mm thick with adequate load-bearing capacity. Consult your Haas dealer for specific foundation requirements based on your soil conditions and building structure.