Mazak QT-Ez 12
Key Specifications
Max Spindle
Spindle Taper
Tool Capacity
Weight
Rapid Traverse
Spindle Power
Overview
The Mazak QT-Ez 12 is the largest chuck size in the QT-Ez value turning center family, offering a 305 mm (12 in) chuck for shops that need to swing bigger workpieces without stepping up to Quick Turn pricing. As a straight 2-axis lathe without live tooling, the QT-Ez 12 focuses purely on turning productivity with Mazak's built-in motor spindle technology.
The QT-Ez 12 delivers a maximum turning diameter of 410 mm (16.13 in) and a maximum turning length of 546 mm (21.47 in). The built-in motor spindle produces 22 kW (30 hp) at up to 3,500 RPM through an A2-8 spindle nose. Bar capacity is 80 mm (3.15 in), handling up to 3-inch bar stock for production bar feeding of larger diameter parts.
The 12-position turret uses bolt-on tooling with fast indexing. Without the complexity of live tools, the QT-Ez 12 keeps setup simple and turret maintenance minimal. The turret handles standard OD turning, boring, grooving, threading, and parting tools for pure turning work.
MAZATROL SmoothEz on a 15-inch touchscreen provides conversational programming that makes the QT-Ez 12 accessible to operators of all skill levels. For shops running standard turning operations, the conversational interface generates programs in minutes without CAM software.
The QT-Ez 12 competes with the Haas ST-30, Doosan Puma 3100, and Okuma LB4000 EX II. It offers Mazak's motor spindle design and build quality at a price point competitive with Korean alternatives. For shops focused on pure turning work in the 12-inch chuck range, the QT-Ez 12 delivers production capability without paying for milling features that would go unused. Specs sourced from Mazak Corporation published data.
Full Specifications
| Parameter | Value |
|---|---|
| Chuck Size | 12" |
| Max Turning Diameter | 410 mm (16.13 in) |
| Max Turning Length | 546 mm (21.47 in) |
| Max Spindle Speed | 3,500 RPM |
| Spindle Motor Power | 22 kW (30 hp) |
| Spindle Taper | A2-8 |
| Bar Capacity | 80 mm (3.15 in) |
| Tool Capacity | 12-position turret |
| Turret Tooling | Bolt-on |
| X Axis Travel | 220 mm (8.66 in) |
| Z Axis Travel | 596 mm (23.47 in) |
| Rapid Traverse Rate | 30 m/min X, 30 m/min Z |
| Machine Weight | 4,500 kg (9,921 lb) |
| CNC Control | MAZATROL SmoothEz |
| Max Machining Diameter | Φ13.5″ |
| Max Machining Length | 21.22″ |
Specifications sourced from mazak.com — verified 2026-03-28
Strengths & Limitations
Strengths
- 12-inch chuck and 80 mm bar capacity handle larger workpieces at value pricing
- Built-in motor spindle eliminates belt vibration for consistent surface finish
- 22 kW spindle power provides solid stock removal capability in steel and stainless
- Pure 2-axis configuration keeps setup simple and maintenance costs low
- MAZATROL SmoothEz conversational programming requires no CAM for standard turning
- Mazak build quality at pricing competitive with Korean and Taiwanese alternatives
Limitations
- No live tooling, Y-axis, or sub-spindle capability; strictly 2-axis turning
- Turning length of 546 mm limits shaft work; longer parts need the QT-350 or QT-450
- 3,500 RPM max spindle speed is slower than smaller QT-Ez models
- SmoothEz control lacks advanced SmoothG features
Best For
Frequently Asked Questions
01
New pricing starts around $75,000 for the base 2-axis model and runs to $110,000 with chip conveyor, tailstock, high-pressure coolant, and bar feeder interface.
02
The Haas ST-30 offers similar capacity at a slightly lower price. The QT-Ez 12 delivers Mazak's motor spindle design and MAZATROL programming for a modest premium.
03
If any of your parts need cross-holes, flats, or tapped features, the 12M saves a second setup. If all work is pure turning, the base 12 saves money and simplifies setup.
04
LNS, Iemca, FMB, and Hydrobar feeders are compatible. Bar capacity is 80 mm (3.15 in) through the A2-8 spindle bore.
Videos
Mazak North America
Mazak North America
Resell CNC
Machinery Revolution
The HEH Group
Community Discussions
Troubleshooting and problem-solving — MazakQT-EZ12Lathe
Owner experience and review — practicalmachinist.com/forum/threads/new-machine-day-mazak-qt-ez....
Pricing and buying discussion — Any experience withMazakQTEZLathe series?
Community discussion — MazakSmooth Turret Alighment
Community discussion — Microsoft Word - Polar coord 2.doc | Forum
Options and configuration advice for this machine model.
Owner experience and review — Harbor Freight 8x12Lathe review | Forum
Links to community discussions. Summaries are editorial — visit the original thread for full context.
