Okuma MULTUS U4000

$450,000 - $650,000 Updated 2026-03-13

Key Specifications

X Travel

650 mm (25.6 in)

Y Travel

230 mm (9.1 in)

Z Travel

1,545 mm (60.8 in); 2,045 mm (80.5 in) optional

Spindle Taper

CAT 50 (No. 50)

Tool Capacity

40 (standard); 80, 120, or 180 optional

Rapid Traverse

30 m/min X; 20 m/min Y; 30 m/min Z

Overview

The Okuma MULTUS U4000 is a large-frame multitasking machine built for shops that need turning, milling, drilling, and boring in a single setup. With a 650 mm max turning diameter and up to 2,000 mm turning length, it handles mid-to-large workpieces that would otherwise require multiple machines and multiple setups.

The turning spindle delivers 3,000 RPM standard with a 4,200 RPM high-speed option, driven by a 22/15 kW (30/20 hp) motor upgradeable to 32/22 kW (43/30 hp). The B-axis milling spindle provides full contouring capability with 12,000 RPM and a CAT 50 taper that gives rigid tool clamping for heavy milling operations. With 40 tools standard and options up to 180 tools, the U4000 can run complex multi-operation parts without operator intervention.

Okuma builds the MULTUS U series on a one-piece bed casting with box-way construction on all linear axes. This gives the U4000 the vibration damping needed for interrupted cuts and heavy roughing passes that roller-guide machines struggle with. The Thermo-Friendly Concept uses sensors throughout the machine structure to compensate for thermal growth in real time, holding dimensional accuracy across 8-hour production runs without manual offsets.

The OSP-P500 control is Okuma's proprietary CNC, built on a Windows-based platform with a 19-inch touchscreen. Unlike Fanuc or Siemens controls that are bolted onto the machine, the OSP is designed alongside the machine structure, giving tighter integration between servo tuning, thermal compensation, and collision avoidance. The Collision Avoidance System (CAS) runs a real-time 3D simulation that checks tool paths against the machine model before cutting.

Sub-spindle and dual-saddle configurations (W, 2S, 2SW) enable complete done-in-one machining of complex parts. This eliminates second-operation setups and the tolerance stack-up that comes with re-fixturing. Shops doing aerospace landing gear, oil and gas valve bodies, or large automotive drivetrain components will find the U4000 sized right for their work.

New MULTUS U4000 machines price between $450,000 and $650,000 depending on configuration. The sub-spindle and dual-saddle options add significant cost but typically pay back within 12-18 months through setup time elimination. Direct competitors include the Mazak INTEGREX i-400, DMG Mori NTX 2500, and Doosan MX 2600ST.

Full Specifications

Parameter	Value
Max Turning Diameter	Ø650
Max Turning Length	1,500 mm (59.1 in); 2,000 mm (78.7 in) optional
Turning Spindle Speed	3,000 RPM; 4,200 RPM optional
Milling Spindle Speed	12,000 RPM
Spindle Taper	CAT 50 (No. 50)
Turning Spindle Power	22/15 kW (30/20 hp); 32/22 kW (43/30 hp) optional
Tool Capacity	40 (standard); 80, 120, or 180 optional
Chuck Size	15 inch (standard)
X-Axis Travel	650 mm (25.6 in)
Y-Axis Travel	230 mm (9.1 in)
Z-Axis Travel	1,545 mm (60.8 in); 2,045 mm (80.5 in) optional
Rapid Traverse Rate	30 m/min X; 20 m/min Y; 30 m/min Z
Machine Weight	19,500 kg (42,990 lb)
CNC Control	OSP-P500
Guide Type	Box ways (all linear axes)
Speed Range	45~4,200
Standard Power	22/15
Rapid Traverse Xa Za	50
Rapid Traverse Zb Y	40
Rapid Traverse Xb	25
Okuma Global Repair Center	Charlotte, North Carolina
Inches	Metric
Spindle Nose Type	JIS A2-8 [JIS A2-11]

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

Strengths & Limitations

Strengths

650 mm turning diameter and up to 2,000 mm turning length handle large multitasking workpieces in a single setup
Box-way construction on all axes provides superior vibration damping for heavy interrupted cuts and aggressive roughing
Thermo-Friendly Concept maintains dimensional accuracy across long production runs without manual thermal offsets
Sub-spindle and dual-saddle options enable true done-in-one machining, eliminating second-operation setups
OSP-P500 control with Collision Avoidance System (CAS) prevents crashes with real-time 3D simulation
Up to 180-tool magazine capacity handles complex multi-operation parts without mid-run tool swapping
CAT 50 milling spindle taper provides rigid clamping for heavy milling operations on hardened materials

Limitations

Starting at $450K, the investment is substantial and requires high-value or high-volume work to justify
OSP control has a learning curve for shops trained on Fanuc or Siemens, typically 2-3 weeks for experienced operators
Large footprint and 19,500 kg weight require solid foundation and significant floor space planning
Okuma's proprietary control limits third-party software integration compared to Fanuc-based competitors
Standard 40-tool magazine is modest for a multitasking machine; larger magazines add significant cost

Best For

Aerospace shops machining landing gear, structural components, and engine casings requiring turning and milling in one setup Oil and gas manufacturers producing large valve bodies, pump housings, and downhole tool components Job shops consolidating multiple machine setups into done-in-one multitasking to reduce lead times Automotive drivetrain manufacturers producing crankshafts, transmission cases, and differential housings Shops running lights-out or minimally attended production that need collision avoidance and high tool capacity Medical device manufacturers producing large orthopedic implant components requiring tight tolerances

Frequently Asked Questions

01 What does an Okuma MULTUS U4000 cost new?

New MULTUS U4000 machines run $450,000-$650,000 depending on configuration. A base machine with standard 40-tool magazine is at the lower end. Adding the sub-spindle, dual-saddle configuration, 120+ tool magazine, and through-spindle coolant pushes toward the upper range. Used units from 2015-2020 appear in the $250,000-$380,000 range.

02 How does the MULTUS U4000 compare to the Mazak INTEGREX i-400?

Both machines compete directly in the large multitasking segment. The U4000 uses box ways for better vibration damping, while the INTEGREX uses roller guides for faster rapids. Okuma's Thermo-Friendly Concept and Mazak's Thermal Shield both address thermal stability. The OSP vs. MAZATROL control debate is largely preference. The U4000 offers a slightly larger work envelope, while the INTEGREX typically has faster cycle times on lighter cuts.

03 What is the Thermo-Friendly Concept on the MULTUS U4000?

Okuma's Thermo-Friendly Concept uses temperature sensors throughout the machine structure, spindle, and ball screws to compensate for thermal growth in real time. Unlike systems that fight heat with chillers, Okuma's approach predicts and compensates for thermal deformation. The result is consistent dimensional accuracy from cold start through 8+ hour production runs without manual offset adjustments.

04 Can the MULTUS U4000 do 5-axis work?

Yes. The B-axis milling spindle provides continuous contouring capability, and combined with C-axis rotation on the turning spindle, the U4000 delivers simultaneous 5-axis machining. This enables complex contouring operations like impeller machining, helical features, and compound-angle drilling without re-fixturing.

05 What floor space does the MULTUS U4000 require?

Plan for approximately 6.5 x 3.0 meters (21.3 x 9.8 ft) with service access on all sides. At 19,500 kg (42,990 lb), the machine requires a reinforced concrete foundation, minimum 300 mm (12 in) thick, with proper vibration isolation from neighboring equipment.