Mazak Quick Turn 400

$150,000 - $250,000 Updated 2026-03-16

Key Specifications

X Travel

310 mm (12.20 in)

Z Travel

1,100 mm (43.31 in)

max turning diameter

580 mm (22.83 in)

max machining length

1,020 mm (40.16 in)

swing over bed

830 mm (32.68 in)

bar capacity

102 mm (4.02 in)

Overview

The Mazak Quick Turn 400 is a large-capacity turning center built for heavy-duty work that exceeds the capability of the popular QT-200 and QT-250 series. With a 15-inch chuck and generous bar capacity, the QT-400 handles the large-diameter forgings, castings, and bar stock that smaller machines simply cannot accommodate.

The main spindle delivers 30 kW (40 hp) at 3,300 RPM through an A2-11 spindle nose with 102 mm (4.02 in) bar capacity. The substantial power output is necessary for roughing large-diameter steel and stainless steel workpieces where deep cuts at moderate surface speeds are the norm. The lower RPM ceiling is appropriate for the 15-inch chuck size — surface speed at maximum diameter is still over 200 m/min, well within the recommended range for carbide tooling in steel.

The work envelope covers 580 mm (22.83 in) maximum turning diameter and 1,020 mm (40.16 in) maximum machining length with axis travels of 310 mm (X) and 1,100 mm (Z). Rapids hit 24 m/min on X and 24 m/min on Z. At roughly 8,500 kg (18,739 lb), the QT-400 requires solid foundation and careful rigging during installation. The 12-station turret accommodates standard OD and ID tooling for turning, boring, and grooving operations.

Current models run on MAZATROL SmoothG, providing advanced conversational programming and cycle optimization for complex turning operations. The QT-400 is a pure 2-axis turning center without live tooling in the base configuration — it is optimized for turning performance rather than mill-turn versatility. A tailstock option supports long shaft work up to 1,020 mm. New machines price between $150,000 and $250,000, with used units from 2010-2020 trading between $60,000 and $150,000. The QT-400 competes with the Haas ST-40, Okuma LB3000 EX II, and Doosan Puma 4000. Specs sourced from Mazak published data and dealer documentation.

Full Specifications

Parameter	Value
Max Turning Diameter	580 mm (22.83 in)
Max Machining Length	1,020 mm (40.16 in)
Swing Over Bed	830 mm (32.68 in)
Bar Capacity	102 mm (4.02 in)
X-Axis Travel	310 mm (12.20 in)
Z-Axis Travel	1,100 mm (43.31 in)
Main Spindle Speed	3,300 RPM
Main Spindle Power	30 kW (40 hp)
Main Spindle Nose	A2-11
Tool Stations	12
Turret Type	Standard turret
Chuck Size	15 in (A2-11)
Rapid Traverse X	24 m/min (945 ipm)
Rapid Traverse Z	24 m/min (945 ipm)
Tailstock	Hydraulic, programmable
CNC Control	MAZATROL SmoothG
Machine Weight	8,500 kg (18,739 lb)

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

Strengths & Limitations

Strengths

30 kW spindle with 15-inch chuck handles heavy roughing on large-diameter steel forgings and castings without sacrificing rigidity
102 mm bar capacity accommodates 4-inch bar stock for large-diameter production turning operations
1,020 mm maximum machining length supports long shaft work with tailstock for the oil and gas, power generation, and heavy equipment industries
MAZATROL SmoothG control provides advanced cycle optimization and conversational programming for complex turning operations
Massive 8,500 kg machine weight provides exceptional rigidity and vibration damping for heavy interrupted cuts
Proven Quick Turn platform reliability with extensive parts and service network across North America

Limitations

8,500 kg machine weight requires solid foundation work and specialized rigging equipment for installation
No live tooling in base configuration; shops needing milling capability must specify the M or MY variant or use a second operation
3,300 RPM spindle speed limits surface speed on small-diameter features; not ideal for small-part aluminum work
24 m/min rapids are moderate for a machine this size; cycle time on long-travel Z-axis moves can add up in production
Large footprint requires significant floor space commitment; smaller shops may struggle to accommodate the machine and bar feeder
Higher acquisition and operating costs versus mid-size lathes; justifiable only when work consistently requires the larger capacity

Best For

Oil and gas manufacturers producing large-diameter valve bodies, flanges, couplings, and pipe fittings in carbon and stainless steel Power generation shops machining turbine shafts, generator components, and large-diameter rings Heavy equipment manufacturers turning large hydraulic cylinder bodies, pins, and bushings Aerospace subcontractors machining large-diameter landing gear components and engine housing blanks Job shops with a steady stream of large-diameter chuck and bar work that cannot fit on 10-inch or 12-inch machines

Frequently Asked Questions

01 What does a new Mazak Quick Turn 400 cost?

New QT-400 machines start around $150,000-$180,000 for base 2-axis configuration. Adding tailstock, high-pressure coolant, chip conveyor, steady rest, and automation brings the price to $200,000-$250,000. Used QT-400 machines from 2010-2020 trade between $60,000 and $150,000 depending on hours, control generation, and options.

02 Is the Quick Turn 400 available with live tooling?

Mazak offers M and MY variants of the QT-400 platform with live tooling and optional Y-axis. The QT-400M adds C-axis and live tool turret capability. The QT-450MY (separate model) provides the fullest mill-turn capability in this size range with both Y-axis and live tooling.

03 How does the QT-400 compare to the Haas ST-40?

The Haas ST-40 is typically $30,000-$50,000 less expensive with comparable work envelope. The Mazak offers higher spindle power (30 kW vs 22.4 kW), MAZATROL conversational control, and generally better build quality and rigidity. The Haas wins on initial cost and simplicity of maintenance.

04 What chuck options are available for the QT-400?

The A2-11 spindle nose accepts 15-inch (381 mm) hydraulic chucks. Common options include Kitagawa BB-315, SMW Autoblok SIN-S 15, and Rohm Duro-A 381. For large-bore work, open-center chucks maximize through-bore capacity. Budget $3,000-$8,000 for a quality 15-inch chuck.

05 What foundation does the QT-400 require?

At 8,500 kg, the QT-400 requires a reinforced concrete foundation typically 200-300 mm thick with proper isolation pads. Mazak provides foundation drawings with machine specifications. Budget $5,000-$15,000 for foundation preparation depending on existing shop floor conditions.