Mazak Quick Turn Nexus 250MY
Key Specifications
Max Spindle
Tool Capacity
Spindle Power
Max Turn Length
max turning diameter
swing over bed
Overview
The Mazak Quick Turn Nexus 250MY is a mid-size CNC turning center with live tooling, C-axis, and Y-axis capability — designed for shops that want to complete complex turned-and-milled parts in a single setup without investing in a full mill-turn machine. At the QTN-250MY's price point, it is one of the most capable done-in-one turning centers available for parts up to 10-inch chuck size.
Max turning diameter is 366 mm (14.41 in) with a turning length of 510 mm (20.08 in) on the standard bed, extending to 1,011 mm (39.8 in) on the long bed. The main spindle runs to 4,500 RPM with 22 kW (30 hp) through an A2-6 nose. The Y-axis provides ±52.5 mm of off-centerline travel, covering most milling and drilling features that sit off the part centerline. Live tools run to 6,000 RPM — fast enough for productive aluminum and steel milling.
The 12-position turret indexes precisely and accepts both VDI 40 stationary and live toolholders. The C-axis provides full 360-degree positioning and contouring for milled slots, hex features, and radial drilling patterns. MAZATROL SmoothG manages the turning, milling, and Y-axis interpolation through an integrated conversational programming system that generates complete multi-operation part programs from drawing dimensions.
The QTN-250MY competes with the Haas ST-20Y, Doosan Lynx 2100LSYB, and Okuma LB3000 EX II MY. Against the Haas, the Mazak delivers more spindle torque, a more capable control, and superior thermal management. The QTN-250MY is a high-volume production tool for mid-size aerospace, automotive, and hydraulic component manufacturers.
Full Specifications
| Parameter | Value |
|---|---|
| Max Turning Diameter | 366 mm (14.41 in) |
| Max Turning Length | 510 mm (20.08 in) / 1,011 mm (39.8 in) long bed |
| Swing Over Bed | 580 mm (22.8 in) |
| Max Spindle Speed | 4,500 RPM |
| Spindle Motor Power | 22 kW (30 hp) at 25% ED; 15 kW (20 hp) continuous |
| Spindle Torque | 626 Nm (462 ft-lb) at 25% ED |
| Spindle Nose | A2-6 |
| Chuck Size | 254 mm (10 in) |
| Bar Capacity | 65 mm (2.56 in) |
| Y Axis Travel | ±52.5 mm (±2.07 in) |
| X Axis Travel | 215 mm (8.46 in) |
| Z Axis Travel | 560 mm (22.05 in) / 1,060 mm long bed |
| Rapid Traverse X | 30 m/min (1,181 ipm) |
| Rapid Traverse Z | 30 m/min (1,181 ipm) |
| Milling Spindle Speed | 6,000 RPM |
| Tool Capacity | 12-position turret (VDI 40) |
| Machine Weight | 6,500 kg (14,330 lb) |
| CNC Control | MAZATROL SmoothG CNC |
Specifications sourced from mazak.com — verified 2026-03-28
Strengths & Limitations
Strengths
- Y-axis with ±52.5 mm travel enables true off-centerline milling and drilling, eliminating secondary setups on VMCs for most part features
- 6,000 RPM live tool spindle provides productive milling performance in aluminum, steel, and stainless for typical turned component features
- MAZATROL SmoothG conversational programming generates complete turning-plus-milling programs from drawing input — no CAM software required for most jobs
- 22 kW built-in main spindle motor eliminates belt vibration and delivers consistent torque across the speed range
- 10-inch chuck handles most mid-size production components while the Y-axis and live tooling add done-in-one capability
- Two bed lengths allow the same platform to handle short chucking work and longer shaft components
Limitations
- ±52.5 mm Y-axis travel is limited for parts with features that sit far off centerline; the QTN-350MY with ±60 mm is the next step up
- No sub-spindle option limits done-in-one capability to front-side machining — backworking still requires a second setup
- 6,000 RPM live tool speed is adequate but not fast enough for aggressive aluminum high-speed milling compared to dedicated VMCs
- 65 mm bar capacity limits bar-fed applications; shops running larger-diameter bar frequently hit the spindle bore limit
Best For
Frequently Asked Questions
01
New pricing ranges from approximately $140,000 to $220,000 depending on bed length, tooling configuration, and optional equipment such as bar feeder interface and high-pressure coolant. Used QTN-250MY machines from 2012–2020 appear regularly on the secondary market in the $55,000–$110,000 range.
02
The Y-axis provides ±52.5 mm of travel from the part centerline, for a total of 105 mm of Y-axis stroke. This covers the vast majority of off-center milling and drilling features on parts up to 10-inch chuck size.
03
Yes. The spindle bore accepts bar stock up to 65 mm (2.56 in) in diameter. For production bar work, a bar feeder can be interfaced directly to the machine. The hydraulic chuck with bar-pull capability is the standard production setup.
04
The Mazak QTN-250MY delivers more spindle torque, a more sophisticated conversational control in MAZATROL SmoothG, and better thermal management than the Haas ST-20Y. The Haas costs roughly 30–40% less. For high-volume production where cycle time and surface finish matter, the Mazak investment typically justifies itself within a few years of production.
05
No. The standard QTN-250MY is a single-spindle machine. For complete done-in-one machining including backworking, shops should look at the Mazak QTN-250MSY (with sub-spindle) or the INTEGREX series for full mill-turn capability.
Videos
Maschinenmarkt Paluch
Maschinenmarkt Paluch
cnc World
Mazak North America
Mazak North America
Community Discussions
Community discussion — Mazak quick turn nexus 250ms 640t control - CNCzone
Troubleshooting and problem-solving — Need Help! Mazak QT Nexus 250-II Problem at startup
Troubleshooting and problem-solving — Problem Nexus 250 Chucking direction - CNCzone
Troubleshooting and problem-solving — Mazak nexus 250 - cnczone.com
Troubleshooting and problem-solving — Mazak Quick Turn Nexus 250 Question : r/Machinists - RedditNeed help programming Mazak line. : r/Machinists - RedditStruggling with Mazak QTN 250-II MY. Need to learn. - RedditMazak Quick Turn : r/Machinists - RedditTandem tool holders : r/Machinists - RedditXC
Community discussion — Need help programming Mazak line. : r/Machinists - Reddit
Community discussion — Struggling with Mazak QTN 250-II MY. Need to learn. - Reddit
Community discussion — Mazak Quick Turn : r/Machinists - Reddit
Links to community discussions. Summaries are editorial — visit the original thread for full context.
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