Haas ST-45Y

$235,000 - $300,000 Updated 2026-03-19

Key Specifications

Max Spindle

1,400 RPM

Spindle Taper

A2-11

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-45Y adds Y-axis milling and live tooling to the ST-45 large-bore platform. With a 178 mm (7.0 in) spindle bore, A2-11 spindle nose, 457 mm (18 in) chuck, and BMT75 live tooling, the ST-45Y handles large-bore tubular work with the added capability to mill cross-holes, flats, and off-center features without a second setup.

The 29.8 kW (40 hp) spindle drives through a 2-speed gearbox, producing 1,898 Nm (1,400 ft-lb) of torque at 150 RPM. Max spindle speed is 1,400 RPM. An optional XP high-performance spindle bumps output to 41.0 kW (55 hp) and 2,847 Nm (2,100 ft-lb). The max cutting envelope is 762 mm (30 in) diameter by 1,118 mm (44 in) length.

The BMT75 turret provides 12 stations of live tooling at 4,000 RPM with 5.6 kW (7.5 hp). Y-axis travel of 102 mm (4.0 in) total enables cross-drilling, milling flats, hexes, and bolt patterns on large-bore components. C-axis positioning resolves to 0.01 degrees for accurate angular feature placement.

The 7-inch bore is the defining feature. Where the ST-40Y handles general large-frame work with its 4.62-inch bore, the ST-45Y is purpose-built for tubular and hollow components that must pass through the spindle. Oil and gas pipe fittings, valve bodies, large-bore couplings, and hollow shafts that need both turning and milling are the sweet spot.

At $235,000-$300,000 configured, the ST-45Y fills the gap between the ST-40Y and the massive ST-55 platform. It competes with the Doosan Puma 4100LMB and Mazak QT-500MY in shops that need large-bore Y-axis capability. Specs derived from Haas Automation published ST-45 and ST-40Y data.

Full Specifications

Parameter	Value
Max Part Swing	35.5 in
Max Cutting Diameter	27.50 in
Max Cutting Length	44.0 in
Chuck Size	457 mm (18 in)
Bar Capacity	165 mm (6.5 in)
Spindle Nose	A2-11
Spindle Bore	7.00 in
Max Spindle Speed	1,400 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	1,118 mm (44 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	11,340 kg (25,000 lb)
CNC Control	Haas Next Generation Control (NGC)
Capacities	S.A.E
Chuck	18.0 in
Bar Capacity W Opt Workholding	6.50 in
Travels	S.A.E
X Axis	20.00 in
Y Axis	± 3.0 in
Z Axis	44.00 in
Feedrates	S.A.E
Rapids On X	472 ipm
Rapids On Y	472 ipm
Rapids On Z	710 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	A2-11
Drive System	2-Speed Gearbox
Max Rating	5.0 hp
Max Speed	4000 rpm
Max Torque	2100.0 ft-lbf @ 150 rpm
Xp Option	S.A.E
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	42.0 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
Dimensions Shipping	S.A.E
Domestic Pallet	216.5 in x 94.3 in x 110.0 in
Export Pallet	216.5 in x 98.0 in x 120.0 in
Footprint Without Conveyor	4267 x 2311 x 2489 mm
Maximum Part Swing	902 mm
Spindle Bore Maximum Spindle Speed	7.0", 1400-rpm
Maximum Power Rating Drive System	29.9kW, 2-Speed Gearbox
Spindle Nose Chuck Size	A2-11, 457 mm
Maximum Cutting Diameter	699 mm
Maximum Cutting Length	1118 mm
Axis Travels	508 mm, ±76 mm,1118 mm
Spindle Bore Maximum Speed	178 mm, 1400-rpm

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

Strengths & Limitations

Strengths

7.0-inch spindle bore with Y-axis milling handles large-bore tubular work with cross-holes and milled features in one setup
BMT75 turret with 7.5 hp live tooling provides aggressive milling capability on large-bore workpieces
40 hp spindle with 1,400 ft-lb of torque through a 2-speed gearbox for heavy roughing on pipe and casing
18-inch chuck on A2-11 nose securely clamps large-bore tubular components for turning and milling
Optional XP spindle to 55 hp and 2,100 ft-lb for the most demanding oil and gas material removal
At $235-300K, offers large-bore Y-axis capability at a fraction of specialty oil-country lathe pricing

Limitations

1,400 RPM max spindle speed limits surface speed on smaller-diameter work and aluminum finishing
18-inch chuck and large spindle assembly add rotational inertia, increasing accel/decel times
Machine weight of 11,340 kg requires heavy-duty foundation and professional rigging
No sub-spindle option on the base ST-45Y — the ST-45SY adds sub-spindle capability at additional cost

Best For

Oil and gas manufacturers turning pipe fittings, couplings, and tubular components with cross-drilled holes and milled features Valve manufacturers machining large-bore valve bodies and bonnets with cross-ports and bolt patterns Heavy industrial shops turning hollow shafts and sleeves with off-center features requiring Y-axis milling Shops that need large through-bore capacity combined with mill-turn versatility in one machine Pipeline and energy sector manufacturers processing large-bore components with milled features

Frequently Asked Questions

01 What does a new Haas ST-45Y cost?

Base price starts around $235,000 with BMT75 turret and Y-axis. Configured with tailstock, XP spindle, chip conveyor, and high-pressure coolant, expect $270,000-$300,000. The Y-axis and BMT75 add approximately $50,000 over the base ST-45.

02 What is the difference between the ST-45Y and ST-40Y?

The ST-45Y has a 178 mm (7.0 in) spindle bore with A2-11 nose and 18-inch chuck, while the ST-40Y has 117.3 mm (4.62 in) bore with A2-8 and 15-inch chuck. The ST-45Y runs 1,400 RPM max versus 2,400 RPM. Choose the ST-45Y for large-bore tubular work; choose the ST-40Y for general large-frame mill-turn with higher RPM.

03 Can the ST-45Y thread pipe and casing?

Yes. The C-axis and live tooling make the ST-45Y well-suited for threading operations on pipe and casing. The 7-inch bore passes pipe stock through the spindle for efficient processing, and the NGC control supports all standard threading cycles.

04 Is the XP spindle upgrade recommended?

For shops primarily machining tough materials or taking heavy roughing passes on large-diameter parts, the XP upgrade to 55 hp and 2,100 ft-lb of torque is strongly recommended. The additional power makes a significant difference on interrupted cuts and heavy material removal in oil and gas applications.