Okuma MA-12500H

$1,200,000 - $2,000,000 Updated 2026-03-13

Key Specifications

Max Spindle

min⁻¹ (rpm)

Spindle Taper

No. 50

Tool Capacity

81 tools

Rapid Traverse

Spindle Power

45/37 [40/37/30 (15 min/30 min/cont), 37/26 (10 min/cont)]

pallet size

1,250 x 1,250 mm (49.2 x 49.2 in)

Overview

The Okuma MA-12500H is Okuma's largest horizontal machining center, built around 1,250 x 1,250 mm pallets for machining oversized workpieces up to 2,000 mm diameter by 1,600 mm height. This machine serves the upper end of the HMC market where workpiece size and weight demand a platform that bridges the gap between standard horizontal machining centers and floor-type boring mills.

The standard No. 50 spindle runs at 6,000 RPM powered by a 45 kW (60 hp) motor at 20-minute rating and 37 kW (50 hp) continuous. This is substantially more power than the MA-8000H's standard 30 kW, reflecting the heavier cutting loads expected on 2,000 mm diameter workpieces. Tool storage accommodates 81 tools standard, providing deep tool capacity for complex multi-face operations on large parts.

Machine dimensions are 6,880 x 12,512 x 3,781 mm, making this a machine that requires significant dedicated floor space with adequate overhead crane capacity. The MA-12500H runs on Okuma's OSP control with Thermo-Friendly Concept, Anti-Crash System, Process Navi, and Servo Navi as standard intelligent technologies.

The MA-12500H competes with floor-type boring mills and large HMCs from manufacturers like Toshiba, SNK, and Kuraki. Okuma's advantage is offering a pallet-changing HMC platform at this scale — most competitors in this size range are single-spindle floor borers without pallet automation capability. This gives the MA-12500H a productivity advantage through dual-pallet operation. New MA-12500H machines typically price in the $1,200,000 to $2,000,000 range depending on configuration. Specs sourced from Okuma Corporation published data.

Full Specifications

Parameter	Value
Pallet Size	1,250 x 1,250 mm (49.2 x 49.2 in)
Max Workpiece Size	ø2,000 x 1,600 mm (ø78.7 x 63.0 in)
Max Spindle Speed	min⁻¹ (rpm)
Spindle Taper	No. 50
Spindle Motor Power	45/37 [40/37/30 (15 min/30 min/cont), 37/26 (10 min/cont)]
Tool Capacity	81 tools
CNC Control	Okuma OSP-P500M
Machine Dimensions	6,880 x 12,512 x 3,781 mm (270.9 x 492.6 x 148.9 in) (W x D x H)
Thermo Friendly Concept	Standard
Anti Crash System	Standard
Process Navi	Standard
Servo Navi	Standard
Pallet System	Dual pallet changer standard
Workpiece Class	Oversized castings, fabrications, structural components
Max Machining Volume	2,200 x 1,650
Rotary Pallet Size	1,250 x 1,250
Rapid Traverse Rate	42
Okuma Global Repair Center	Charlotte, North Carolina
Inches	Metric
Spindle Speed	50~6,000 [10~4,500, 50~12,000]
Magazine Capacity	81 [129, 177]

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

Strengths & Limitations

Strengths

1,250 x 1,250 mm pallets with ø2,000 x 1,600 mm workpiece capacity covers oversized parts that would require a floor-type boring mill on competing platforms
Dual-pallet operation provides productivity advantages over single-setup floor borers by allowing part loading while the spindle cuts
45 kW spindle power with 81-tool magazine provides the cutting capability and tool capacity needed for complex large-part operations
Thermo-Friendly Concept is critical at this machine scale where thermal effects are proportional to machine size
Anti-Crash System protects against crashes that can cost $100,000+ in repairs on machines of this scale
Okuma's single-source control integration provides reliability and serviceability that competing large-machine builders cannot match

Limitations

6,000 RPM maximum spindle speed limits surface speed capability — adequate for steel and cast iron but not ideal for aluminum-heavy work
Machine footprint of 6,880 x 12,512 mm requires a dedicated large bay with substantial overhead crane capacity for workpiece loading
Premium pricing starting at $1,200,000 limits this machine to shops with consistent large-part production volume
Foundation requirements for a machine of this size add significant installation cost beyond the machine purchase
Limited secondary market availability makes resale and used pricing unpredictable

Best For

Heavy equipment manufacturers machining large gear housings, machine bases, and structural weldments up to 2,000 mm diameter Energy sector shops producing large turbine casings, generator frames, and compressor housings Marine and defense manufacturers machining large vessel components, submarine fittings, and armor plate assemblies Mining equipment manufacturers producing large crusher components, mill housings, and excavator structural parts Shops replacing floor-type boring mills with pallet-changing HMCs for improved productivity on large-part production Aerospace manufacturers machining large structural components and engine casings in the 2,000 mm diameter class

Frequently Asked Questions

01 What does a new Okuma MA-12500H cost?

New MA-12500H machines typically price between $1,200,000 and $2,000,000 depending on spindle options, tool magazine configuration, and automation. Installation costs including foundation work, rigging, and electrical can add $100,000-$300,000. Used MA-12500H machines are rare due to the specialized nature of the applications.

02 How does the MA-12500H compare to a floor-type boring mill?

The MA-12500H offers automatic pallet changing for dual-workpiece operation, a structured and rigid machine frame, and Okuma's intelligent technology suite. Floor borers typically offer more flexibility in workpiece size but require manual setup changes. The MA-12500H wins on productivity for parts that fit within the work envelope. Floor borers win on maximum workpiece size and flexibility for truly oversized parts.

03 What crane capacity do I need?

Loading workpieces up to 2,000 mm diameter on 1,250 mm pallets requires overhead crane capacity matched to your maximum workpiece weight. For the parts this machine typically handles, crane capacity of 10-30 tons is common. The pallet changer handles the horizontal pallet transfer automatically — the crane is needed only for workpiece loading at the setup station.

04 Can the MA-12500H run unattended?

Yes, within the constraint of a two-pallet system. One pallet cuts while the operator loads the other. The 81-tool magazine provides deep tool capacity for complex operations. Tool life management and the Anti-Crash System support unattended cutting cycles. For the large, high-value parts this machine typically processes, most shops prefer having an operator available rather than running fully lights-out.