Yamazaki Mazak CNC Lathes / Turning Centers

Mazak Quick Turn NEXUS 350 II MY

$250,000 - $380,000 Updated 2026-03-17

Key Specifications

Tool Capacity

12-position turret (VDI 50)

Max Turn Length

1,524 mm (60.0 in)

max turning diameter

660 mm (25.98 in)

max spindle speed

2,500 RPM

spindle motor power

37 kW (50 hp)

spindle torque

1,500 Nm (1,106 ft-lbs)

Overview

The Mazak Quick Turn NEXUS 350 II MY is a large-bore turning center with live milling and Y-axis capability, built for shops that need to machine sizable chucked parts complete in a single setup. The "350" denotes the machine class aimed at 12-inch chuck work, while the MY suffix confirms the milling spindle and Y-axis are standard — not optional add-ons. It's a direct step up from the QTN 250 II MY for shops running larger flanges, housings, valve bodies, and shaft-type components.

The main spindle is rated at 37 kW (50 hp) with a maximum speed of 2,500 RPM and peak torque exceeding 1,500 Nm. That low-speed torque profile is intentional — this machine is built for heavy turning in steel, cast iron, stainless, and large-diameter inconel parts where chip load matters more than RPM. Bar capacity through the A2-11 spindle nose measures 105 mm (4.13 in), and the 12-inch chuck swings parts to 660 mm (25.98 in) over the bed.

The milling spindle runs to 6,000 RPM at 7.5 kW (10 hp) through a VDI 50 turret interface. Y-axis travel provides 105 mm (4.13 in) above and below centerline, covering standard cross-milling, tapping, hex features, and off-center drilling that come up on large industrial components. The 12-position turret accommodates both turning and live tooling stations in a single disc.

The machine runs on Mazak's MAZATROL SmoothG control, which supports conversational programming for complex turned features and full EIA/ISO G-code for CAM-posted programs. At approximately 12,500 kg (27,558 lb), it delivers the thermal mass needed to maintain dimensional consistency during long turning cycles. Direct competitors include the Okuma LB4000 EX II MY, DMG Mori NLX 3000/700, and Doosan Puma 400 MY.

Full Specifications

Parameter	Value
Max Turning Diameter	660 mm (25.98 in)
Max Turning Length	1,524 mm (60.0 in)
Max Spindle Speed	2,500 RPM
Spindle Motor Power	37 kW (50 hp)
Spindle Torque	1,500 Nm (1,106 ft-lbs)
Bar Capacity	105 mm (4.13 in)
Spindle Nose	A2-11
Chuck Size	305 mm (12 in)
Milling Spindle Speed	6,000 RPM
Milling Spindle Power	7.5 kW (10 hp)
Y Axis Travel	±105 mm (4.13 in)
X Axis Travel	350 mm (13.78 in)
Z Axis Travel	1,570 mm (61.8 in)
Tool Capacity	12-position turret (VDI 50)
Number Of Axes	4 (X, Z, C, Y)
Rapid Traverse Xz	20 m/min (787 ipm)
Machine Weight	12,500 kg (27,558 lb)
CNC Control	MAZATROL SmoothG CNC

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

Strengths & Limitations

Strengths

37 kW (50 hp) main spindle with 1,500 Nm torque handles heavy roughing on large-diameter steel, stainless, and cast iron without slowing down
105 mm bar capacity handles larger bar stock than most competing 12-inch class machines, giving more flexibility on shaft and sleeve work
Y-axis travel of ±105 mm enables off-center milling, hex features, and cross-drilling on large industrial components without secondary operations
12-inch chuck with 660 mm max turning diameter covers the full range of flanges, valve bodies, and housings that overflow smaller 10-inch class machines
MAZATROL SmoothG control supports both conversational and EIA/ISO programming, easing transition for shops moving from Fanuc or Siemens
VDI 50 tooling interface provides robust, rigid live tool mounting appropriate for the power level and workpiece size of this machine class

Limitations

2,500 RPM max spindle speed limits performance on small-diameter or high-speed turning; shops regularly running small parts are better served by a higher-RPM machine
Starting around $250K, the investment requires consistent large-diameter work to justify against a basic engine lathe or smaller CNC turning center
12,500 kg machine weight demands careful foundation planning and adequate rigging capacity during installation
MAZATROL SmoothG is proprietary; shops standardized on Fanuc or Siemens face a learning curve and may encounter post-processor challenges

Best For

Oilfield and energy shops machining large valve bodies, flanges, and downhole components requiring turned and milled features complete Aerospace subcontractors producing large engine casings, structural housings, and ring-type components on 12-inch chuck equipment Heavy industrial job shops running a mix of large chucked work in steel and stainless where 10-inch class machines are consistently at their limits Pump and compressor manufacturers needing to machine housings and impeller seats with off-center features in a single setup

Frequently Asked Questions

01 What is the difference between the Quick Turn NEXUS 350 II MY and the QTN 250 II MY?

The 350 II MY is the larger machine, featuring a 12-inch chuck versus the 250's 10-inch, a 37 kW (50 hp) main spindle versus 26 kW (35 hp), and 105 mm bar capacity versus 65 mm. The 350 is designed for larger chucked parts and heavier material removal. If your parts consistently hit or exceed the 250's swing or torque limits, the 350 II MY is the logical step up.

02 Can the QTN 350 II MY run bar feed production?

Yes, with a bar feeder matched to the 105 mm spindle bore capacity. The machine interfaces with standard magazine-style bar feeders. However, at 37 kW and 1,500 Nm, this machine is optimized for chucked work rather than fast-cycling bar production. Shops primarily running bar stock should consider whether the QTN 250 II MSY or a NEXUS 300 MSY better matches their workflow.

03 What milling operations can the QTN 350 II MY perform?

Cross-drilling, face milling, radial drilling, tapping, hex and flat milling, keyway cutting, and off-center bore features are all within reach using the 12-position VDI 50 live turret and ±105 mm Y-axis. The 6,000 RPM milling spindle at 7.5 kW handles typical secondary operations on large turned parts. For dedicated heavy milling, a VMC or INTEGREX would be more appropriate.

04 How does the QTN 350 II MY compare to the DMG Mori NLX 3000/700?

Both are capable large-bore MY-class turning centers in a similar size and price range. The Mazak offers MAZATROL conversational programming and strong Mazak dealer support across North America. The DMG Mori runs CELOS with a Fanuc or Siemens control underneath, which suits shops already standardized on those platforms. Spindle specifications are broadly comparable; the decision typically comes down to control preference, dealer proximity, and negotiated pricing.