Haas ST-40LY

$225,000 - $290,000 Updated 2026-03-19

Key Specifications

Max Spindle

2,400 RPM

Spindle Taper

A2-8

Tool Capacity

12 Stations

Spindle Power

40.0 hp

max part swing

35.5 in

max cutting diameter

27.50 in

Overview

The Haas ST-40LY is the long-bed Y-axis variant of the ST-40 large-frame turning center platform. It combines the ST-40 29.8 kW (40 hp) spindle and 381 mm (15 in) chuck with extended Z-axis travel and Y-axis milling capability, creating a large-format mill-turn machine for long, heavy parts with off-center features.

The redesigned large-frame platform delivers a 902 mm (35.5 in) max part swing with a cutting diameter of 699 mm (27.5 in) using the BMT75 turret. The extended Z-axis provides 2,032 mm (80 in) of travel for long shafts, pipe components, and extended workpieces. X-axis travel is 508 mm (20 in) with Y-axis travel of 102 mm (4.0 in) total.

The spindle drives through a 2-speed gearbox, producing 1,898 Nm (1,400 ft-lb) of torque at 150 RPM with a max speed of 2,400 RPM. An optional XP high-performance spindle bumps output to 41.0 kW (55 hp) and 2,847 Nm (2,100 ft-lb). The 117.3 mm (4.62 in) spindle bore handles bar stock up to 102 mm (4.0 in).

The BMT75 turret provides 12 stations of live tooling at 4,000 RPM with 5.6 kW (7.5 hp) of milling power. The larger BMT75 format is more rigid than the BMT-65 used on smaller models, handling heavier tool loads and more aggressive milling on larger workpieces. C-axis positioning resolves to 0.01 degrees.

At $225,000-$290,000 configured, the ST-40LY is the long-bed large-format mill-turn machine in the Haas lineup. It targets shops machining long shafts, pipe components, and extended workpieces with cross-holes, flats, and milled features. Popular in oil and gas, power generation, and heavy equipment manufacturing. Specs derived from Haas Automation published ST-40 and ST-40Y data.

Full Specifications

Parameter	Value
Max Part Swing	35.5 in
Max Cutting Diameter	27.50 in
Max Cutting Length	80.0 in
Chuck Size	15.0 in
Bar Capacity	4.00 in
Spindle Nose	A2-8
Spindle Bore	4.62 in
Max Spindle Speed	2,400 RPM
Spindle Motor Power	40.0 hp
Spindle Torque	1,898 Nm (1,400 ft-lb) @ 150 RPM
Spindle Drive	2-Speed Gearbox
Xp Spindle Power	41.0 kW (55 hp)
Xp Spindle Torque	2,847 Nm (2,100 ft-lb) @ 150 RPM
X Axis Travel	508 mm (20 in)
Y Axis Travel	102 mm (4.0 in) total / ±50.8 mm (±2.0 in)
Z Axis Travel	2,032 mm (80 in)
Rapid Traverse X	18.0 m/min (710 ipm)
Rapid Traverse Z	18.0 m/min (710 ipm)
Tool Capacity	12 Stations
Live Tooling Speed	4,000 RPM
Live Tooling Power	5.6 kW (7.5 hp)
C Axis Positioning	±0.01°
Tailstock Taper	MT5
Coolant Capacity	95 gal
Machine Weight	12,247 kg (27,000 lb)
CNC Control	Haas Next Generation Control (NGC)
Capacities	S.A.E
Travels	S.A.E
X Axis	20.00 in
Y Axis	± 3.0 in
Z Axis	80.00 in
Feedrates	S.A.E
Rapids On X	472 ipm
Rapids On Y	472 ipm
Rapids On Z	320 ipm
Axis Motors	S.A.E
Max Thrust X	5500 lbf
Max Thrust Y	2300 lbf
Max Thrust Z	9000 lbf
Spindle	S.A.E
Spindle Taper	A2-8
Max Rating	5.0 hp
Max Speed	4000 rpm
Max Torque	2100.0 ft-lbf @ 150 rpm
Xp Option	S.A.E
Drive System	2-Speed Gearbox
Input Ac Voltage Low	220 VAC
Full Load Amps Low	70 A
Input Ac Voltage High	440 VAC
Full Load Amps High	35 A
Main Spindle C Axis	S.A.E
Positioning	0.01 °
Brake Diameter	21.5 in
Brake Holding Torque	450 ft-lbf
Control Type	Interpolated Motion and Positioning
Tailstock	S.A.E
Taper	MT5
Travel	84.5 in
Max Thrust	3,000 lbf
Min Thrust	200 lbf
Turret	S.A.E
Od Vs Id Tools	Any Combination (will vary with turret)
Index Time	2 s
Boring Bar Rear Clearance	4.50 in
Tooling	BMT75
Live Tooling	S.A.E
General	S.A.E
Air Requirements	S.A.E
Air Required	4 scfm @ 100 psi
Inline Air Hose	3/8 in
Coupler	3/8 in
Air Pressure Min	80 psi
Electrical Specification	S.A.E

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

Strengths & Limitations

Strengths

2,032 mm (80 in) Z-axis travel with Y-axis milling handles long shafts and pipe with cross-holes and milled features in one setup
BMT75 turret with 7.5 hp live tooling provides aggressive milling capability on large workpieces
40 hp spindle with 1,400 ft-lb of torque through a 2-speed gearbox for heavy material removal
Optional XP spindle upgrade to 55 hp and 2,100 ft-lb for demanding roughing in tough alloys
15-inch chuck on A2-8 nose securely clamps large-diameter workpieces for heavy turning and milling
At $225-290K, significantly undercuts comparable long-bed large-frame mill-turn machines from Mazak and Okuma

Limitations

2,400 RPM max spindle speed limits surface speed on smaller-diameter aluminum finishing work
Machine weight approaching 12,250 kg requires heavy-duty floor preparation and professional rigging
No sub-spindle option limits done-in-one capability for parts needing back-working
Extended bed length and Y-axis hardware create a very large footprint on the shop floor

Best For

Long-shaft mill-turn work on components up to 80 inches with cross-holes, flats, and milled features Oil and gas manufacturers machining long pipe, couplings, and downhole tools with secondary milling features Power generation shops turning long turbine shafts and rotor components with off-center features Heavy equipment manufacturers producing long axles, drive shafts, and spindles requiring mill-turn capability Shops needing the largest long-bed Y-axis turning center Haas offers for extended workpiece machining

Frequently Asked Questions

01 What does a new Haas ST-40LY cost?

Base price starts around $225,000. Configured with tailstock, XP spindle, chip conveyor, high-pressure coolant, steady rests, and gearbox, expect $260,000-$290,000. The long-bed Y-axis premium over the standard ST-40 is approximately $50,000-$60,000.

02 What is the difference between the ST-40LY and the ST-40Y?

The ST-40LY extends Z-axis travel to 2,032 mm (80 in) compared to the standard ST-40Y bed. Spindle, chuck, Y-axis, and turret specs are identical. The longer bed adds weight, footprint, and a price premium. Choose the LY variant when your parts regularly exceed the standard Z-travel length.

03 How does the ST-40LY compare to the Mazak QT-400MSY-L?

The Mazak offers a sub-spindle option, higher spindle speeds, and the SmoothG control with more sophisticated mill-turn interpolation. It costs $80-120K more. The ST-40LY is the value option for shops that need long-bed large-format Y-axis turning without a $350K+ investment.

04 Do I need steady rests for the ST-40LY?

For long, slender parts with high length-to-diameter ratios, steady rests are essential to prevent deflection and chatter. The 80-inch Z-travel means many workpieces will benefit from mid-span support. Plan your setup to position steady rests clear of the milling zone.