Okuma Horizontal Machining Centers (HMC)

Okuma MB-4000H

$250,000 – $375,000 Updated 2026-03-17

Key Specifications

Max Spindle

min⁻¹ (rpm)

Spindle Taper

No. 40 (BT40)

Tool Capacity

48 tools standard

Rapid Traverse

60,000

Spindle Power

26/18.5 kW (10 min/continuous) (35/25 hp)

pallet size

400 x 400 mm (15.7 x 15.7 in)

Overview

The Okuma MB-4000H is a 400 mm horizontal machining center built on Okuma's proven box-way platform, delivering the rigidity-focused performance that production shops require when machining steel, cast iron, and other ferrous materials. With 400 x 400 mm pallets supporting workpieces up to 600 mm diameter by 900 mm height, the MB-4000H targets automotive, aerospace, and general manufacturing applications where consistent accuracy and surface finish under production loads matter more than maximum axis speed.

The 15,000 RPM No. 40 spindle produces 26 kW (35 hp) at 10-minute rating and 18.5 kW (25 hp) continuous. This spindle configuration provides a strong balance of speed for aluminum and torque for steel, making the MB-4000H a versatile platform for shops running mixed materials. Standard tool storage holds 48 tools, adequate for most multi-face machining operations on 400 mm pallets. Machine dimensions are 2,420 x 4,700 x 2,647 mm — compact relative to its work envelope.

Box-way construction across all axes is the MB-4000H's defining characteristic. Compared to linear-guide alternatives like Okuma's own MA-4000H, box ways provide superior vibration damping during heavy cutting. This translates to measurably better surface finish in steel and cast iron, and longer tool life in production environments running high material removal rates. The trade-off is lower rapid traverse — box ways limit axis speed compared to linear guides.

The machine runs on Okuma's OSP-P500M control with Thermo-Friendly Concept, Anti-Crash System, Process Navi, and Servo Navi. A dual pallet changer is standard, enabling load/unload on one pallet while cutting on the other. The MB-4000H competes with the Mazak HCN-4000, DMG Mori NHX 4000, Makino a40, and Haas EC-400. New machines price $250,000–$375,000. 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	ø600 x 900 mm (ø23.6 x 35.4 in)
Max Spindle Speed	min⁻¹ (rpm)
Spindle Taper	No. 40 (BT40)
Spindle Motor Power	26/18.5 kW (10 min/continuous) (35/25 hp)
Tool Capacity	48 tools standard
Guideway Type	Box ways (all axes)
Pallet System	Dual pallet changer (standard)
CNC Control	Okuma OSP-P500M
Machine Dimensions	2,420 x 4,700 x 2,647 mm (W x D x H)
Thermo Friendly Concept	Standard
Anti Crash System	Standard
Process Navi	Standard
Servo Navi	Standard
Max Machining Volume	560 x 560 x 625
Rotary Pallet Size	400 x 400
Spindle Power Hi Winding	26/18.5 [30/22]
Rapid Traverse Rate	60,000
Okuma Global Repair Center	Charlotte, North Carolina
Inches	Metric
Spindle Speed	50 ~ 15,000 [50 ~ 20,000]
Magazine Capacity	48 [64, 110, 146, 182, 218] Multi-Magazine

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

Strengths & Limitations

Strengths

Box-way construction on all axes provides superior vibration damping for better surface finish and longer tool life compared to linear-guide alternatives
15,000 RPM No. 40 spindle balances speed for aluminum and torque for steel, making the MB-4000H versatile across material types
Compact 2,420 x 4,700 mm footprint fits in tight shop layouts while maintaining full 400 mm pallet capability
Dual pallet changer standard — no waiting to load the next part while cutting is in progress
Thermo-Friendly Concept maintains dimensional accuracy across shifts, reducing scrap and rework in production environments
48-tool standard magazine provides adequate capacity for most production operations without expanded magazine cost

Limitations

Box-way construction limits rapid traverse and acceleration compared to linear-guide alternatives like the MA-4000H, adding non-cutting time
ø600 x 900 mm workpiece envelope is smaller than some 400 mm-class competitors, limiting tombstone and tall-fixture flexibility
No. 40 taper limits maximum chip load in the heaviest roughing applications compared to No. 50 machines
Okuma's OSP control has a smaller third-party ecosystem for post processors compared to Fanuc-based machines

Best For

Job shops entering horizontal machining for the first time, where the MB-4000H's competitive pricing and box-way rigidity provide excellent value Production shops primarily cutting steel and cast iron where box-way vibration damping improves surface finish and tool life Automotive component manufacturers running medium-volume production of brackets, housings, and fittings on 400 mm pallets Shops with limited floor space needing horizontal machining capability in the smallest possible footprint General manufacturing environments running mixed materials where the 15,000 RPM spindle handles both aluminum and steel adequately

Frequently Asked Questions

01 What does a new Okuma MB-4000H cost?

New MB-4000H machines typically price between $250,000 and $375,000 depending on options. Expanded tool magazines, through-spindle coolant, probing systems, and automation add to the base price. Used MB-4000H machines from 2012–2020 trade between $80,000 and $180,000 depending on hours and condition.

02 How does the MB-4000H compare to the Okuma MA-4000H?

The MB-4000H uses box ways for rigidity and vibration damping, while the MA-4000H uses linear guides for speed and acceleration (60 m/min rapids, 1.0G). Choose the MB-4000H for steel and cast iron work where surface finish under load matters most. Choose the MA-4000H for high-volume production where cycle time drives profitability and parts are primarily aluminum or require light cuts.

03 Is 48 tools enough for production work on the MB-4000H?

For most single-part programs running on 400 mm pallets, 48 tools is adequate. The limitation appears in high-mix production where different parts on each pallet require different tool sets. For high-mix shops, expanded magazine options are available. Most production operations running focused part families find 48 tools sufficient.

04 What maintenance does box-way construction require?

Box ways require proper lubrication through the machine's automatic lube system and periodic way cover inspection. The maintenance trade-off versus linear guides is more frequent lube system checks, but box ways are more tolerant of chip contamination and last longer in harsh cutting environments with heavy coolant use and abrasive chips.

05 Can the MB-4000H be integrated with automation?

Yes. The dual pallet changer is the baseline automation. Multi-pallet systems, pallet pool automation, and robot tending are all compatible with the MB-4000H platform. Okuma's Armroid and Standroid automation options can be configured for unattended operation on production runs.