Okuma HB400

$280,000 - $425,000 Updated 2026-03-16

Key Specifications

Max Spindle

15,000 RPM

Spindle Taper

No. 40 (BT40)

Tool Capacity

40 tools (standard); 80 tools (optional)

Rapid Traverse

60 m/min (X/Y/Z)

Spindle Power

26/18.5 kW (peak/continuous) (35/25 hp)

pallet size

400 x 400 mm (15.7 x 15.7 in)

Overview

The Okuma HB400 is a compact 400mm pallet horizontal machining center engineered for high-speed, high-accuracy production of small-to-medium prismatic parts in automotive, electronics, and precision general manufacturing. Positioned as a high-performance production machine rather than a general-purpose HMC, the HB400 prioritizes rapid traverse, acceleration, and spindle speed to minimize cycle times on parts with complex multi-face geometry.

The 15,000 RPM No. 40 spindle produces 26 kW of peak power and drives axis rapids of 60 m/min, placing the HB400 among the faster machines in the 400mm HMC class. The dual pallet system with 400 x 400 mm pallets enables continuous production with load/unload happening during machine cutting time. Workpieces up to 500 mm diameter by 800 mm tall are accommodated, appropriate for the diverse part sizes encountered in automotive and precision component production.

Okuma's Thermo-Friendly Concept is central to the HB400's accuracy proposition — maintaining consistent positioning across the full production shift without thermal warmup programs or coolant chiller dependence. The OSP-P500M control includes the complete Okuma intelligent technology suite: Anti-Crash System, Machining Navi, Servo Navi, and 5-axis Auto-Tuning for shops that add rotary axes. Linear guide construction on all axes enables the high rapids and acceleration that define the HB400's cycle time advantage over box-way alternatives.

The HB400 competes with the Mazak HCN-4000, DMG Mori NHX 4000, Makino a40, and Brother Speedio W1000Xd1 in the compact high-speed HMC segment. For production environments where cycle time drives profitability and parts are primarily aluminum or light steel, the HB400's speed profile provides meaningful cost-per-part advantages. New HB400 machines price between $280,000 and $425,000 depending on options and automation. Specs sourced from Okuma Corporation published data.

Full Specifications

Parameter	Value
Pallet Size	400 x 400 mm (15.7 x 15.7 in)
Max Workpiece Size	ø500 x 800 mm (ø19.7 x 31.5 in)
X Y Z Travel	560 x 640 x 640 mm (22.0 x 25.2 x 25.2 in)
Max Spindle Speed	15,000 RPM
Spindle Taper	No. 40 (BT40)
Spindle Motor Power	26/18.5 kW (peak/continuous) (35/25 hp)
Tool Capacity	40 tools (standard); 80 tools (optional)
Rapid Traverse Rate	60 m/min (X/Y/Z)
Guideway Type	Linear guides (all axes)
CNC Control	Okuma OSP-P500M
Thermo Friendly Concept	Standard
Anti Crash System	Standard
Pallet System	Dual pallet changer standard
Okuma Global Repair Center	Charlotte, North Carolina

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

Strengths & Limitations

Strengths

60 m/min rapid traverse on all axes with high acceleration keeps non-cutting time minimal, delivering strong cost-per-part performance in high-volume production
15,000 RPM No. 40 spindle with 26 kW peak power handles aluminum at maximum speed and steel at reduced parameters — versatile across a mixed material portfolio
Dual pallet changer ensures continuous machine utilization by loading and unloading during cutting, a fundamental advantage over single-pallet VMC alternatives
Full Okuma intelligent technology suite (Thermo-Friendly, Anti-Crash, Machining Navi) is standard, providing accuracy and protection capabilities that competitors charge extra for

Limitations

Linear guide construction, while enabling high speed, provides less vibration damping than box-way alternatives for heavy roughing in cast iron and hardened steel
ø500 x 800 mm workpiece envelope is smaller than some 400mm-class competitors, limiting tombstone height and larger workpiece configurations
40-tool standard ATC may require an expanded magazine for high-mix production where diverse part families each require unique tooling

Best For

Automotive Tier 1 suppliers running high-volume aluminum transmission housings, pump bodies, and covers where 60 m/min rapids and 15,000 RPM spindle speed are cycle time differentiators Precision component manufacturers producing complex prismatic parts in aluminum, brass, and light steel requiring high-accuracy 4-sided machining Job shops converting from VMC production to horizontal machining for the first time, seeking the cycle time and part quality benefits of HMC with a familiar 400mm scale Electronics and semiconductor equipment manufacturers machining precision aluminum and stainless steel components requiring consistent accuracy across multi-shift production

Frequently Asked Questions

01 How does the HB400 compare to the MB-4000H in Okuma's lineup?

The HB400 uses linear guides for 60 m/min rapids and a 15,000 RPM spindle, prioritizing speed for aluminum and light steel production. The MB-4000H uses box ways for superior vibration damping and rigidity, prioritizing surface finish and tool life in steel and cast iron production. The HB400 wins on cycle time for aluminum; the MB-4000H wins on surface finish and tool life for heavy cutting.

02 What pallet automation options are available for the HB400?

Beyond the standard dual pallet changer, the HB400 can be integrated with Okuma's FMS pallet management system for multi-machine cells with shared pallet pools. Rail-guided pallet transport systems link multiple HB400 machines to a common load station, enabling automated production scheduling of different part families. Okuma's FMS software manages pallet routing, tool life, and production sequencing across the cell.

03 What is the chip-to-chip time on the HB400?

The HB400's chip-to-chip time (tool change time) is approximately 2.5 seconds with the standard 40-tool chain magazine. This fast tool change speed, combined with 60 m/min rapids, minimizes non-cutting time between operations — particularly valuable for programs with many tools and frequent tool changes, such as complex aluminum housings with numerous drilling, boring, and tapping cycles.

04 Is the HB400 suitable for titanium aerospace machining?

The HB400 can machine titanium but is not optimized for aggressive titanium roughing. Linear guides provide less vibration damping than box ways, which can lead to chatter during heavy titanium cuts. For titanium aerospace production requiring aggressive material removal rates, the Okuma MA-550H or MA-600H with their rigidity-focused construction are better choices. The HB400 is more appropriate for light titanium finishing and precision titanium component production.

05 Does the HB400 support a 4th rotary axis on the pallet table?

The standard HB400 includes B-axis table rotation for 4-face indexing at 1-degree increments. A full CNC B-axis option provides continuous 4th axis capability for interpolated 4-axis machining of helical and angled features. For shops requiring full 5-axis capability, Okuma's MU-series vertical 5-axis machines or the MB-5000H with trunnion table are appropriate alternatives.