Mazak SLANT TURN 550

$280,000 - $450,000 Updated 2026-03-19

Key Specifications

Max Spindle

1,200 RPM

Spindle Taper

A2-15

Spindle Power

45 kW (60 hp)

chuck size

From 21"

max turning diameter

910 mm (35.83 in)

max turning length short

1,016 mm (40 in)

Overview

The Mazak SLANT TURN 550 is a large-bore, heavy-duty horizontal CNC lathe designed for shops that need through-spindle capacity beyond what the SLANT TURN 500 provides. With a 21-inch minimum chuck and a massive 275 mm (10.83 in) spindle bore, the ST-550 handles large-diameter pipe, tubular stock, and heavy castings that simply cannot fit through smaller machines.

The SLANT TURN 550 delivers a maximum turning diameter of 910 mm (35.83 in), matching the 500 series, but the 10.83-inch bore is the critical differentiator. This enormous through-spindle capacity enables pipe threading, facing, and turning operations on tubular stock up to 10 inches in diameter without external chuck support. The main spindle produces 45 kW (60 hp) at up to 1,200 RPM with massive torque output suited for heavy roughing at large diameters.

Multiple bed lengths are available: 1,016 mm (40 in), 2,009 mm (79.09 in), 3,144 mm (123.78 in), and 4,033 mm (158.78 in). The longest configuration provides over 13 feet of turning length for long pipe, shaft, and structural tube work. The slant-bed construction ensures rigidity and effective chip management even during aggressive cuts.

A 12-station disc turret handles standard turning operations with programmable tailstock support for shaft work. MAZATROL SmoothG provides the conversational programming interface.

The SLANT TURN 550 competes with the Okuma LB6000 EX, Doosan Puma 700, and Hwacheon Mega 68. New machines price between $280,000 and $450,000 depending on bed length. The ST-550 is the right choice when the 7.28-inch bore of the SLANT TURN 500 is not sufficient for your workpiece pass-through requirements.

Full Specifications

Parameter	Value
Chuck Size	From 21"
Max Turning Diameter	910 mm (35.83 in)
Max Turning Length Short	1,016 mm (40 in)
Max Turning Length Medium	2,009 mm (79.09 in)
Max Turning Length Long	3,144 mm (123.78 in)
Max Turning Length Xl	4,033 mm (158.78 in)
Max Spindle Speed	1,200 RPM
Spindle Motor Power	45 kW (60 hp)
Spindle Bore	275 mm (10.83 in)
Spindle Taper	A2-15
Tool Stations	12 (disc turret)
Bar Capacity	275 mm (10.83 in)
X Axis Travel	400 mm (15.75 in)
Z Axis Travel	1,100 - 4,100 mm (43.31 - 161.42 in)
Rapid Traverse X	16 m/min (630 ipm)
Rapid Traverse Z	12 m/min (472 ipm)
Tailstock	Hydraulic, programmable quill
CNC Control	MAZATROL SmoothG
Machine Weight	14,000 kg (30,865 lb) approx.
Max Torque	5163 ft･lbs
Main Spindle Power	45 kW（60 HP）
Max Machining Diameter	Φ35.83"
Max Machining Length	80.47" / 125.16" / 160.16"

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

Strengths & Limitations

Strengths

10.83-inch spindle bore is among the largest available, enabling through-spindle work on 10-inch pipe and tubular stock
45 kW spindle delivers massive torque for aggressive roughing at large diameters in steel and cast iron
35.83-inch max turning diameter handles large flanges, castings, and forgings in a single setup
Four bed lengths up to 158 inches provide flexibility from short chucking to long pipe and shaft work
21-inch minimum chuck securely grips large-diameter workpieces for heavy cutting
Slant-bed construction ensures excellent chip evacuation during aggressive heavy-duty operations

Limitations

1,200 RPM max spindle speed is quite slow, limiting surface speed on all but the largest diameters
14,000 kg machine weight requires heavy-duty foundation and crane infrastructure for installation
No live tooling or milling capability; the 550M variant is required for cross-drilling and tapping
Rapid traverse at 12-16 m/min is slow, adding non-cutting time on long bed configurations

Best For

Pipe and tube manufacturers needing 10-inch through-spindle bore for large-diameter threading and facing Oil and gas shops machining large wellhead components, blowout preventer parts, and manifold blocks Power generation manufacturers turning large turbine shafts and generator components over 13 feet long Heavy equipment manufacturers producing large hydraulic cylinders and structural tube assemblies Shipbuilding and marine shops turning large propeller shafts and drive components

Frequently Asked Questions

01 What does a new Mazak SLANT TURN 550 cost?

New pricing ranges from $280,000 for the short-bed to $450,000 for the extra-long bed with full options. Each bed length step adds approximately $40,000-$60,000. Used units from 2008-2020 trade between $100,000 and $250,000.

02 SLANT TURN 550 vs 500: when to step up?

Step up to the 550 when you need through-spindle bore larger than 7.28 inches. The 550 provides 10.83-inch bore and a 21-inch chuck. Both share the same 35.83-inch max turning diameter, so the bore is the deciding factor.

03 Can the SLANT TURN 550 thread large pipe?

Yes, large-diameter pipe threading is a primary application. The 10.83-inch bore allows pipe up to 10 inches to pass through the spindle. MAZATROL SmoothG includes conversational threading cycles for single-point, multi-start, and API threading.

04 What foundation does the SLANT TURN 550 require?

At 14,000 kg, the ST-550 requires a reinforced concrete foundation typically 300-400 mm thick. Budget $15,000-$30,000 for foundation preparation. The extra-long bed version requires additional floor space planning.