Okuma MULTUS U4000

Est. $450,000 - $650,000 Updated 2026-08-10

Key Specifications

Tool Capacity

40 tools

Rapid Traverse

Xa/Za 50 m/min (1,968 ipm); Zb/Y 40 m/min (1,574 ipm); Xb 25 m/min (980 ipm)

standard chuck size

10 in

max machining diameter

650 mm (25.59 in)

max work length

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

spindle speed

45~4,200 min⁻¹

Overview

The Okuma MULTUS U4000 is a horizontal multi-tasking machine — a turning centre with a tilting milling spindle — sized around a 10-inch chuck. Maximum machining diameter is 650 mm (25.59 in) and maximum work length is either 1,500 mm or 2,000 mm (59.06 or 78.74 in) depending on the bed specified. Those two figures set the boundary of the work: substantial shafts, housings and flanges, with the bed choice rather than the swing usually deciding the specification.

The main spindle runs from 45 to 4,200 min⁻¹ on a JIS A2-8 nose, with a JIS A2-11 nose available for larger workholding, driven by a 22/15 kW (30/20 hp) motor rated at 30 minutes and continuous respectively. The gap between those two ratings is worth reading properly: sustained production programs should be planned against 15 kW, with the 22 kW figure available for roughing passes rather than for a whole shift.

The axis naming describes the layout. Rapid traverse is quoted as 50 m/min (1,968 ipm) on Xa and Za, 40 m/min (1,574 ipm) on Zb and Y, and 25 m/min (980 ipm) on Xb — an upper milling head with its own X, Y and Z, and a lower saddle carrying its own X and Z. That second saddle is what allows two cutting points to work at once on suitable parts, and the slower Xb rate reflects its role as a plunging rather than a positioning axis.

Tool capacity is 40 tools, which is a genuinely usable library for a machine expected to complete a part in one cycle: turning tools, drills, taps and milling cutters for both ends can stay resident rather than being swapped mid-job.

The U4000 is offered in W, 2S and 2SW configurations, adding a second spindle, a second saddle, or both. Footprint is 5,425 × 2,995 × 2,955 mm (213.58 × 117.91 × 116.34 in) for the shorter bed and 6,175 mm long for the 2,000 mm version. It suits shops currently moving medium-to-large parts between a lathe and a machining centre and losing accuracy and lead time in the transfer.

Full Specifications

Parameter	Value
Standard Chuck Size	10 in
Max Machining Diameter	650 mm (25.59 in)
Max Work Length	1,500 / 2,000 mm (59.06 / 78.74 in)
Spindle Speed	45~4,200 min⁻¹
Spindle Nose	JIS A2-8 [JIS A2-11]
Spindle Motor	22/15 kW (30/20 hp), 30 min/cont
Rapid Traverse Rate	Xa/Za 50 m/min (1,968 ipm); Zb/Y 40 m/min (1,574 ipm); Xb 25 m/min (980 ipm)
Tool Capacity	40 tools
Machine Dimensions	5,425 × 2,995 × 2,955 mm (213.58 × 117.91 × 116.34 in); 6,175 × 2,995 × 2,955 mm (243.11 × 117.91 × 116.34 in)
Spec Extension	W, 2S, 2SW

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

Strengths & Limitations

Strengths

650 mm (25.59 in) maximum machining diameter with up to 2,000 mm (78.74 in) of work length handles substantial shafts, housings and flanges in one setup
An upper milling head and a lower saddle each carry their own axes, so two cutting points can work at once on parts that suit it
Rapid traverse of 50 m/min (1,968 ipm) on Xa and Za, with 40 m/min (1,574 ipm) on Zb and Y
Forty tool pockets is a genuinely usable library for a machine expected to complete a part in one cycle - turning tools, drills, taps and cutters for both ends stay resident
W, 2S and 2SW specifications add a second spindle, a second saddle, or both, so the platform scales with the work
A 22/15 kW (30/20 hp) spindle running 45 to 4,200 min⁻¹ on a JIS A2-8 nose, with an A2-11 nose available for larger workholding

Limitations

The spindle motor is rated 22/15 kW (30/20 hp) at 30 minutes and continuous - plan sustained production against 15 kW and treat 22 kW as roughing headroom
Maximum spindle speed is 4,200 min⁻¹, which limits small-diameter work where surface speed rather than torque governs the cut
The lower saddle's Xb rapid is 25 m/min (980 ipm), half the upper head's rate - it is a plunging axis rather than a positioning one
The 2,000 mm bed makes the machine 6,175 mm long against 5,425 mm, and it is 2,995 mm wide either way, so floor planning is a real constraint
Coordinating an upper head and a lower saddle, particularly in the 2S and 2SW configurations, is a genuine programming step up

Best For

Medium-to-large parts currently moved between a lathe and a machining centre, losing accuracy and lead time in the transfer Aerospace structural components and casings within 650 mm (25.59 in) of diameter Oil and gas valve bodies, pump housings and downhole tool components Long shaft and housing work up to 2,000 mm (78.74 in) Shops consolidating several setups into a single done-in-one operation

Frequently Asked Questions

01 What size work does the MULTUS U4000 handle?

Maximum machining diameter is 650 mm (25.59 in) around a 10-inch chuck, and maximum work length is 1,500 mm or 2,000 mm (59.06 or 78.74 in) depending on the bed specified. In practice the bed choice rather than the swing usually decides the specification.

02 What do the Xa, Xb, Za and Zb axis names mean?

They describe two independent carriers: an upper milling head with its own X, Y and Z, and a lower saddle with its own X and Z. The rapid rates follow those roles - 50 m/min (1,968 ipm) on Xa and Za, 40 m/min (1,574 ipm) on Zb and Y, and 25 m/min (980 ipm) on Xb, the lower saddle's plunging axis. Two cutting points can work at once on parts that suit it.

03 What do the W, 2S and 2SW specifications add?

W adds a second spindle, 2S adds a second saddle, and 2SW adds both. That is how the platform scales from operator-loaded work up to genuinely unattended complete-part production without changing the base machine.

04 Is the 40-tool capacity enough?

For most complete-part programs, yes. Forty pockets holds turning tools, drills, taps and milling cutters for both ends of a part without swapping mid-job, which is the point of a machine like this. Very complex work can still outgrow it, so count the tool list at quoting stage rather than assuming.

05 How much power does the spindle have?

The main spindle motor is rated 22/15 kW (30/20 hp) at 30 minutes and continuous respectively, running from 45 to 4,200 min⁻¹. The gap between those two ratings is worth reading properly: plan sustained production programs against 15 kW, and use the 22 kW figure for roughing passes rather than for a whole shift.