Okuma Mill-Turn / Multi-Tasking Machines

Okuma MULTUS B400II-W

Est. USD 600,000 - USD 850,000 Specs verified 2026-08-09 · okuma.co.jp Updated 2026-10-03

Key Specifications

Tool Capacity

20 tools

Rapid Traverse

40/26 m/min (1,575/1,024 ipm), X,Z/Y

standard chuck size

10 in

max machining diameter

710 mm (27.95 in)

max work length

1,500 / 2,000 mm (59.06 / 78.74 in)

spindle speed

38~3,800 min⁻¹ [30~2,800 min⁻¹ optional]

How much does the Okuma MULTUS B400II-W cost?

Estimated price range

Est.USD 600,000 - USD 850,000

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 B400II-W is a long-bed multitasking mill-turn machine in the second-spindle specification, with a 10 in standard chuck, a maximum machining diameter of 710 mm (27.95 in) and work lengths of 1,500 / 2,000 mm (59.06 / 78.74 in). Okuma's table defines the W in the name as the second-spindle specification.

Length is what sets it apart. At 1,500 or 2,000 mm of work length, this is a machine for shafts, rolls, spindles and long hydraulic components, parts that are milled, drilled and turned along their length and then finished on both ends. With a second spindle the part can be gripped at each end in turn, or held at both ends while the middle is machined.

The main spindle runs 38~3,800 min⁻¹ on a 22/15 kW (30/20 hp) motor rated at 50% ED/cont, through a JIS A2-8 nose. Bracketed alternatives are a JIS A2-11 nose and a 30~2,800 min⁻¹ range, which is what to ask about for larger bar or heavier chucks. These speeds are well below the 50~6,000 min⁻¹ of the MULTUS B200II, as expected for a spindle carrying a 10 in chuck and long, heavy work.

Rapids are 40 m/min (1,575 ipm) in X and Z and 26 m/min (1,024 ipm) in Y, and the magazine holds 20 tools. Floor space needs planning: the two listed sizes are 5,750 × 2,693 × 3,000 mm (226.38 × 106.02 × 118.11 in) and 7,050 × 2,693 × 3,137 mm (277.56 × 106.02 × 123.50 in), so the longer machine is also the taller of the two.

Full Specifications

Parameter	Value
Standard Chuck Size	10 in
Max Machining Diameter	710 mm (27.95 in)
Max Work Length	1,500 / 2,000 mm (59.06 / 78.74 in)
Spindle Speed	38~3,800 min⁻¹ [30~2,800 min⁻¹ optional]
Spindle Nose	JIS A2-8 [JIS A2-11]
Spindle Motor	22/15 kW (30/20 hp), 50% ED/cont
Rapid Traverse Rate	40/26 m/min (1,575/1,024 ipm), X,Z/Y
Tool Capacity	20 tools
Machine Dimensions	5,750 × 2,693 × 3,000 mm (226.38 × 106.02 × 118.11 in); 7,050 × 2,693 × 3,137 mm (277.56 × 106.02 × 123.50 in)
Spec Extension	W (second-spindle specification)

Specifications sourced from okuma.co.jp — verified 2026-08-09

Strengths & Limitations

Strengths

Work lengths of 1,500 / 2,000 mm (59.06 / 78.74 in) for shafts and other long parts
Second spindle is part of the W specification, so both ends can be machined in one cycle
22/15 kW (30/20 hp) main spindle motor, rated 50% ED/cont, on a JIS A2-8 nose with JIS A2-11 as an option
Maximum machining diameter of 710 mm (27.95 in), the same figure Okuma lists for the MULTUS B400II
40 m/min (1,575 ipm) rapids in X and Z shorten the long Z moves a machine of this length makes

Limitations

The 20-tool magazine is small for long parts that combine turning, milling and drilling
Top spindle speed is 3,800 min⁻¹, or 2,800 min⁻¹ with the optional range, which limits small-diameter turning
The footprint reaches 7,050 × 2,693 × 3,137 mm (277.56 × 106.02 × 123.50 in) in the longer version
No figures for the second spindle, milling spindle or B axis are in the listed rows

Best For

Shafts and rolls up to 1,500 or 2,000 mm long Long parts needing turning and milling on both ends in one setup Large-diameter chucked work within 710 mm (27.95 in) Heavy bar and chuck work using the optional JIS A2-11 spindle nose

Frequently Asked Questions

01 What does the W mean in MULTUS B400II-W?

Okuma's table lists W as the second-spindle specification. The MULTUS B400II-W therefore has a second spindle in addition to the main one, which allows a part to be transferred and finished on its second end without an operator turning it around.

02 How long and how large a part can it machine?

Maximum machining diameter is 710 mm (27.95 in) and work length is listed as 1,500 / 2,000 mm (59.06 / 78.74 in), two versions of the machine. The standard chuck is listed at 10 in, and no maximum part weight is given in the listed rows.

03 What are the main spindle speed and power?

38~3,800 min⁻¹ as standard with a 22/15 kW (30/20 hp) motor rated 50% ED/cont. A 30~2,800 min⁻¹ range is the listed option. The spindle nose is JIS A2-8, with JIS A2-11 as the bracketed alternative.

04 How much floor space does the MULTUS B400II-W need?

Okuma lists machine dimensions of 5,750 × 2,693 × 3,000 mm (226.38 × 106.02 × 118.11 in) and 7,050 × 2,693 × 3,137 mm (277.56 × 106.02 × 123.50 in). Width is the same for both. Allow extra room beyond these for chip conveyor discharge, part handling and door access.

05 How does it relate to the MULTUS B400II?

The MULTUS B400II lists the same 710 mm (27.95 in) maximum turning diameter, the same JIS A2-8 nose with JIS A2-11 as an option, a VAC 22/15 kW (VAC 30/20 hp) spindle motor and 40 m/min rapids in X and Z. The MULTUS B400II-W adds the second spindle.