Okuma Mill-Turn / Multi-Tasking Machines

Okuma MULTUS B550

Est. $700,000 - $1,000,000 Specs verified 2026-10-03 · okuma.com Updated 2026-10-03

Image: d30jruhmdicmo0.cloudfront.net, Okuma

Key Specifications

Tool Capacity

40 tools

Rapid Traverse

40/40/40 m/min (1,574/1,574/1,574 ipm)

Spindle Power

37/30 kW (50/40 hp)

spindle speed

30–3,000 rpm

spindle nose

A2-11

max turning diameter

830 mm (32.68 in)

How much does the Okuma MULTUS B550 cost?

Estimated price range

Est.$700,000 - $1,000,000

Our best estimate for a mill-turn / multi-tasking machine in this class — not a quote from Okuma. Configuration moves it a long way.

Overview

The Okuma MULTUS B550 is a large multitasking lathe: 830 mm (32.68 in) of maximum turning diameter, an A2-11 spindle nose and 37/30 kW (50/40 hp) of spindle power, with the spindle running 30–3,000 rpm. It holds 40 tools.

It sits between two neighbours. The MULTUS B400II turns 710 mm (27.95 in) on a JIS A2-8 nose and offers the A2-11 size only as a bracketed option. The MULTUS B750 has the same A2-11 nose, the same 37/30 kW (50/40 hp) and the same 40 tools as the B550, and opens the turning diameter to 1,050 mm (41.34 in). The B550 is thus the smallest of the three on which the big nose is the standard fit.

Rapid traverse is listed as 40/40/40 m/min (1,574/1,574/1,574 ipm), so no axis lags the others when the tool repositions. A 3,000 rpm ceiling suits the diameters this machine is built for. Small features on a large part will run below their ideal surface speed, and that is the trade to weigh if the work mix includes small-diameter turning.

Full Specifications

Parameter	Value
Spindle Speed	30–3,000 rpm
Spindle Nose	A2-11
Rapid Traverse Rate	40/40/40 m/min (1,574/1,574/1,574 ipm)
Tool Capacity	40 tools
Max Turning Diameter	830 mm (32.68 in)
Spindle Motor Power	37/30 kW (50/40 hp)

Specifications sourced from okuma.com — verified 2026-10-03

Strengths & Limitations

Strengths

A2-11 spindle nose as the standard fit; on the MULTUS B400II that size is only the bracketed option
37/30 kW (50/40 hp) of spindle power across a 30–3,000 rpm range
830 mm (32.68 in) maximum turning diameter with a 40-tool capacity
Rapid traverse of 40 m/min (1,574 ipm) on every listed axis

Limitations

Spindle speed stops at 3,000 rpm, which holds back surface speed on small diameters
The MULTUS B750 turns 1,050 mm (41.34 in) with the same nose and power, so parts close to the 830 mm limit may belong on the larger machine
Okuma's page for this model gives no turning length, Y travel or machine weight

Best For

Large chucking parts up to 830 mm (32.68 in) in turning diameter Heavy turning that draws on 37/30 kW (50/40 hp) Work mounted on an A2-11 spindle nose Long multi-operation cycles using up to 40 tools

Frequently Asked Questions

01 What is the difference between the MULTUS B550 and the MULTUS B750?

Turning diameter. The MULTUS B550 turns up to 830 mm (32.68 in) and the MULTUS B750 up to 1,050 mm (41.34 in). Both have an A2-11 spindle nose, 37/30 kW (50/40 hp) of spindle power and 40 tools.

02 How does the MULTUS B550 compare with the MULTUS B400II?

The MULTUS B550 is the larger machine: 830 mm (32.68 in) of turning diameter against 710 mm (27.95 in), and an A2-11 nose as standard where the MULTUS B400II has JIS A2-8 with A2-11 as the option. The MULTUS B550 lists 37/30 kW (50/40 hp); the MULTUS B400II lists VAC 22/15 kW (VAC 30/20 hp).

03 What spindle does the MULTUS B550 have?

An A2-11 nose, a 30–3,000 rpm speed range and 37/30 kW (50/40 hp) of spindle power. Okuma's product page gives one configuration for this model and shows no bracketed options for nose, speed or power.