Okuma MULTUS B550

$700,000 - $1,000,000 Updated 2026-03-13

Key Specifications

Tool Capacity

40 (options: 60, 80, 120, 160)

Rapid Traverse

40/40/40

max turning diameter

Ø830

max machining length

3,000 mm (118.1 in)

main spindle speed

3,000 RPM

main spindle power

37/30 kW (50/40 hp)

Overview

The Okuma MULTUS B550 is a large-capacity horizontal multitasking turning and milling center that bridges the gap between the B400II and the massive B750. With a maximum turning diameter of 850 mm (33.5 in) and maximum machining length of 3,000 mm (118.1 in), it handles the large shaft and cylinder work common in oil and gas, power generation, and aerospace applications where both length and diameter demand a substantial machine.

The main turning spindle delivers 37/30 kW (50/40 hp) at up to 3,000 RPM with 700 Nm (516 ft-lb) of torque through an A2-11 spindle nose with 104 mm (4.09 in) bar capacity. The milling spindle runs up to 10,000 RPM with 30/22 kW (40/30 hp) through a Capto C8 interface, the larger Capto size providing additional rigidity for heavy boring and face milling on the oversized workpieces this machine handles.

The B-axis swings 225 degrees (-30 to +195 degrees) with direct-drive and 0.001-degree minimum increment. X-axis travel is 550 mm (21.7 in), Y-axis is 250 mm (9.8 in), and Z-axis is 3,000 mm (118.1 in). The substantial Y-axis range enables off-center milling across the full workpiece length. Rapid traverse is 36 m/min on X and 30 m/min on Z. The standard ATC holds 40 tools with options up to 160.

An optional sub-spindle handles back-end machining on long shaft parts, while an optional lower turret adds simultaneous cutting capability. The 3,000 mm Z-axis travel with optional steady rest supports long-shaft turning with high rigidity.

Okuma's Thermo-Friendly Concept is critical on a machine this long, where thermal expansion across 3 meters of bed length can shift end-to-end dimensions by significant amounts. Collision Avoidance System models the complex machine envelope. The MULTUS B550 competes with the Mazak Integrex e-500H, DMG Mori CTX gamma 3000 TC, and WFL M65. Pricing runs $700,000-$1,000,000 new. Machine weight is approximately 25,000 kg (55,116 lb).

Full Specifications

Parameter	Value
Max Turning Diameter	Ø830
Max Machining Length	3,000 mm (118.1 in)
Main Spindle Speed	3,000 RPM
Main Spindle Power	37/30 kW (50/40 hp)
Main Spindle Torque	700 Nm (516 ft-lb)
Spindle Nose	A2-11
Bar Capacity	104 mm (4.09 in)
Milling Spindle Speed	10,000 RPM
Milling Spindle Power	30/22 kW (40/30 hp)
Milling Tool Interface	Capto C8
B Axis Range	-30° to +195° (225° swing, 0.001° increment)
X Axis Travel	550 mm (21.7 in)
Y Axis Travel	250 mm (9.8 in)
Z Axis Travel	3,000 mm (118.1 in)
Tool Capacity	40 (options: 60, 80, 120, 160)
Rapid Traverse Rate	40/40/40
Sub Spindle	Optional
Lower Turret	Optional
Machine Weight	25,000 kg (55,116 lb)
CNC Control	Okuma OSP-P300SA
Speed Range	30~3,000
Standard Power	37/30
Okuma Global Repair Center	Charlotte, North Carolina
Inches	Metric
Spindle Nose Type	A2-11

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

Strengths & Limitations

Strengths

3,000 mm machining length handles long shafts, drill collars, and cylinder components that shorter multitasking machines cannot reach
Capto C8 milling interface provides heavy-duty rigidity for boring and face milling on the large workpieces this machine handles
700 Nm main spindle torque enables deep roughing passes on large-diameter steel and alloy forgings
250 mm Y-axis travel provides generous off-center reach across the full 3-meter workpiece length
104 mm bar capacity covers large bar stock sizes for heavy-duty production turning
Tool magazine scales to 160 positions for complex long parts requiring dozens of different tools

Limitations

Capital cost of $700,000-$1,000,000 limits the machine to shops with consistent large-part volume or high-value components
25,000 kg weight and 3+ meter bed length require significant floor space and foundation engineering
3,000 RPM maximum main spindle speed is optimized for large diameters; smaller-diameter work suffers from limited surface footage
Complex programming for multitasking on 3-meter-long parts with B-axis requires advanced CAM and experienced programmers
10,000 RPM milling spindle speed is lower than the 12,000 RPM available on the B200II and B400II

Best For

Oil and gas manufacturers machining long drill collars, spool bodies, and valve assemblies requiring turning and milling along the full length Aerospace shops producing long landing gear cylinders, actuator bodies, and engine shaft components in a single setup Power generation manufacturers machining turbine shafts, generator rotors, and long cylindrical components with complex features Defense contractors producing cannon barrels, torpedo components, and precision long cylindrical parts Shops replacing separate long-bed lathes and large HMCs with a single multitasking platform for complex long parts Heavy equipment manufacturers machining hydraulic cylinders, pump shafts, and drivetrain components

Frequently Asked Questions

01 What does an Okuma MULTUS B550 cost?

A new MULTUS B550 typically runs $700,000-$1,000,000 depending on sub-spindle, lower turret, tool magazine size, and steady rest options. Foundation and rigging costs add significantly. Used machines are relatively rare due to the specialized nature of the platform.

02 How does the MULTUS B550 compare to the B400II?

The B550 has 3,000 mm machining length versus 1,500 mm, 850 mm turning diameter versus 710 mm, 37 kW spindle versus 30 kW, Capto C8 versus C6 milling interface, and 104 mm bar capacity versus 80 mm. The B550 is for significantly longer and larger parts; the B400II covers mid-size work at lower cost.

03 Can the B550 machine drill collars?

Yes, the 3,000 mm machining length and 850 mm turning diameter cover standard drill collar sizes. The B-axis milling spindle handles the cross-drilling, boring, and thread milling required for drill collar connections. Optional steady rest supports the long workpiece during turning operations.

04 What is the Capto C8 advantage over Capto C6?

Capto C8 has a larger coupling diameter than C6, providing more rigidity and higher clamping force. This matters for heavy boring with long overhangs, face milling with large-diameter cutters, and deep-hole drilling that generates high radial forces. The C8 interface matches the cutting demands of the larger workpieces the B550 handles.

05 Does the B550 need a steady rest?

For long, slender shaft work, a steady rest is highly recommended to prevent deflection and chatter during turning. The optional steady rest positions at programmable locations along the Z-axis to support the workpiece near the cutting point. Shorter, more rigid workpieces may not require it.