Haas ST-30Y

$95,000 - $130,000 Updated 2026-03-10

Key Specifications

Max Spindle

3,400 RPM

Spindle Taper

A2-6

Tool Capacity

12-station BMT-65 turret

Weight

6,486 kg (14,300 lb)

Spindle Power

22.4 kW (30 hp)

max cutting diameter

349 mm (13.75 in)

Overview

The Haas ST-30Y is the bigger brother to the ST-20Y, bumping up to a 806 mm (31.75 in) swing over the front apron, 349 mm (13.75 in) max cutting diameter, and 826 mm (32.5 in) max cutting length. With a 76 mm (3 in) bar capacity and 254 mm (10 in) chuck on an A2-6 nose, it covers the mid-size turning work that the ST-20Y can't reach.

Spindle power sits at 22.4 kW (30 hp) with 407 Nm (300 ft-lbs) of torque at 500 RPM, topping out at 3,400 RPM. That's 50% more power than the ST-20Y, enough to rough steel and stainless without constantly backing off feed rates. An optional gearbox pushes torque to 1,356 Nm (1,000 ft-lbs) at 150 RPM for heavy interrupted cuts and large-diameter work. The 89 mm (3.5 in) spindle bore handles through-spindle work the smaller ST-20 can't touch.

The Y-axis is the real selling point here. You get 102 mm (4 in) of total Y-travel on a 12-station BMT-65 turret with live tooling spinning at 6,000 RPM. That's enough to mill flats, drill off-center holes, and tap without pulling the part and walking it to a VMC. The BMT tooling gives better rigidity during milling operations than the bolt-on turret on the ST-20Y. C-axis positioning at plus or minus 0.01 degrees allows full interpolation for live tooling work.

Haas redesigned the ST-30 platform from the ground up, increasing the wedge angle from 45 to 55 degrees for better chip flow and faster evacuation when running a chip conveyor. At 6,486 kg (14,300 lb), it has solid thermal stability for the price class.

Haas runs this on their NGC control, same as every other machine in the lineup. If your shop already runs Haas mills, your operators won't need retraining. The control handles conversational programming, rigid tapping, and full C-axis interpolation.

At roughly $95,000-$130,000 configured, the ST-30Y sits in a sweet spot between budget Y-axis lathes and the $150K+ Japanese competition. It won't match a Mazak QT-250MSY or Okuma LB3000 EX II for outright rigidity, but it delivers solid Y-axis turning capability at a price that makes sense for job shops and mid-volume production. Popular in oil and gas, hydraulic component, and automotive shops that need off-center features without a second-op VMC setup. Specs sourced from Haas Automation published data and verified dealer listings.

Full Specifications

Parameter	Value
Max Cutting Diameter	349 mm (13.75 in)
Max Cutting Length	826 mm (32.5 in)
Max Swing Over Front Apron	806 mm (31.75 in)
Max Swing Over Cross Slide	527 mm (20.75 in)
Max Swing Over Tailstock	584 mm (23 in)
Between Centers	762 mm (30 in)
Max Spindle Speed	3,400 RPM
Spindle Motor Power	22.4 kW (30 hp)
Spindle Torque	407 Nm (300 ft-lbs) @ 500 RPM
Spindle Torque Optional Gearbox	1,356 Nm (1,000 ft-lbs) @ 150 RPM
Spindle Taper	A2-6
Spindle Bore	89 mm (3.5 in)
Chuck Size	254 mm (10 in)
Bar Capacity	76 mm (3 in)
X Axis Travel	318 mm (12.5 in)
Y Axis Travel	102 mm (4 in) total / ±50.8 mm (±2 in)
Z Axis Travel	584 mm (23 in)
Rapid Traverse X Y	12.0 m/min (472 IPM)
Rapid Traverse Z	24.0 m/min (945 IPM)
Max Thrust X	18,238 N (4,100 lbf)
Max Thrust Y	10,231 N (2,300 lbf)
Max Thrust Z	22,686 N (5,100 lbf)
Tool Capacity	12-station BMT-65 turret
Live Tooling Speed	6,000 RPM
C Axis Power	3.7 kW (5 hp)
C Axis Positioning	±0.01°
Coolant Capacity	208 L (55 gal)
Machine Weight	6,486 kg (14,300 lb)
CNC Control	Haas Next Generation Control (NGC)

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

Strengths & Limitations

Strengths

30 hp spindle with 300 ft-lbs of torque handles heavy roughing in steel and stainless without backing off feeds
Optional gearbox pushes torque to 1,000 ft-lbs at 150 RPM for large-diameter interrupted cuts that would stall smaller machines
76 mm (3 in) bar capacity covers most common bar stock sizes, a big step up from the ST-20Y's 51 mm limit
BMT-65 turret with live tooling at 6,000 RPM provides real milling rigidity, not just token off-center drilling
Same NGC control as every Haas mill and lathe, so cross-training operators is straightforward
At $95-130K configured, it undercuts comparable Mazak and Okuma Y-axis lathes by $30-50K
Redesigned 55-degree wedge angle improves chip flow and evacuation, keeping the work zone cleaner during production runs

Limitations

3,400 RPM spindle speed is lower than the ST-20Y's 4,000 RPM, limiting small-diameter finish work and aluminum surface speeds
5 hp C-axis motor is adequate for drilling and tapping but struggles with aggressive milling cuts or deep pocketing
14,300 lb machine weight requires solid floor preparation and rigging considerations for installation
No sub-spindle option on the base ST-30Y limits done-in-one capability for parts needing back-working
Resale value drops faster than Japanese competitors, losing 40-50% in the first 5 years based on used market listings

Best For

Job shops needing Y-axis turning for mid-size parts without a six-figure commitment to Japanese iron Production turning of bar stock up to 76 mm (3 in) diameter with secondary milling and drilling operations Oil and gas fittings, hydraulic components, and automotive parts with off-center features that would otherwise need a second-op VMC Haas mill shops expanding into turning who want a single control platform across the floor Contract manufacturers running mixed short-run and mid-volume work on a single machine Shops replacing older manual lathes that need live tooling to consolidate second-op work

Frequently Asked Questions

01 What does a new Haas ST-30Y cost?

Base price starts around $95,000. Adding common options like a tailstock, chip conveyor, high-pressure coolant, parts catcher, and bar feeder interface pushes the configured price to $115,000-$130,000. The optional gearbox adds roughly $5,000 but gives you 1,000 ft-lbs of torque at 150 RPM. Used ST-30Y machines from 2016-2020 typically sell in the $45,000-$75,000 range depending on hours and condition.

02 What's the difference between the ST-20Y and the ST-30Y?

The ST-30Y is larger in every dimension. It jumps from 51 mm to 76 mm bar capacity, 20 hp to 30 hp spindle power, and a smaller work envelope to 349 mm (13.75 in) max cutting diameter with 826 mm (32.5 in) max cutting length. The ST-30Y also uses a BMT-65 turret instead of the ST-20Y's bolt-on turret, giving better rigidity during milling operations. The trade-off is about $15-20K more on the sticker price and a lower 3,400 RPM max spindle speed versus the ST-20Y's 4,000 RPM.

03 How does the ST-30Y compare to the Mazak QT-250M?

The Mazak has a SmoothG or Meldas control with better mill-turn interpolation and generally tighter tolerances out of the box. But the Mazak costs $40-60K more configured. The ST-30Y is the value option. The Mazak is the machine you buy when cycle time and surface finish tolerances are critical and the budget supports it.

04 Can the ST-30Y handle serious milling work?

It handles drilling, tapping, flat milling, and shallow pocketing well with the 5 hp C-axis motor and BMT-65 live tooling. Forum users report running 38 mm (1.5 in) diameter drills without issues. For aggressive milling like deep pockets, large face mills, or 3D surfacing, you'll want a dedicated mill-turn like the Mazak INTEGREX i-200 or Okuma MULTUS B250II.

05 Can the ST-30Y do 4-axis simultaneous machining?

Yes. The machine supports simultaneous X, Y, Z, and C-axis interpolation for operations like swarf milling. You'll need a CAM package that supports mill-turn, like Inventor HSM Ultimate or Mastercam. Forum users have confirmed this capability works in production, though setup and post-processor configuration takes some effort the first time.

06 What maintenance issues should I watch for?

Forum reports mention occasional turret alignment drift, especially after heavy interrupted cuts. Regular alignment checks every 6 months are recommended. The BMT tooling is more durable than the bolt-on style, but live tooling bearings should be inspected at the 5,000-hour mark. Coolant filtration matters since the 30 hp spindle generates more heat and chips than the smaller ST-20.