OKK HM 630

$700,000 - $950,000 Updated 2026-03-16

Key Specifications

X Travel

900 mm (35.4 in)

Y Travel

900 mm (35.4 in)

Z Travel

900 mm (35.4 in)

Spindle Taper

BT50 / CAT50

Tool Capacity

80 tools (ATC)

Rapid Traverse

60 m/min

Overview

The OKK HM 630 is a CNC horizontal machining center with a 630 mm pallet, targeting production machining of large prismatic components in automotive, aerospace, and industrial manufacturing. OKK's HM series extends the company's precision manufacturing philosophy into the HMC segment, applying the same structural rigidity and thermal management principles used in their VP vertical machining center line to a horizontal configuration with dual-pallet and 4-axis pallet indexing capability.

The HM 630's 630 x 630 mm pallet and 900 mm³ machining envelope handle the full range of large automotive transmission cases, hydraulic manifolds, turbine housings, and aerospace structural components that the 630mm HMC class is designed for. OKK's box-in-box construction positions the spindle head within a cross-rail structure for maximum structural stiffness, reducing spindle head deflection under heavy milling forces on large steel castings and hard alloy aerospace components.

A 50 kW spindle at 10,000 RPM (standard) handles aggressive stock removal from large cast iron and steel workpieces in the first operations typical of automotive powertrain component machining. The dual-pallet configuration maintains near-continuous operation in production environments — one pallet machines while the operator loads and unloads the other pallet station.

At $700,000-$950,000, the OKK HM 630 is positioned above mid-market HMC brands (Doosan, Hyundai WIA) and below premium brands (Makino a81nx, Mazak HCN-6800), positioning it in the upper mid-range for customers who value Japanese precision manufacturing heritage and OKK's application engineering depth in automotive and aerospace machining.

Full Specifications

Parameter	Value
Pallet Size	630 x 630 mm (24.8 x 24.8 in)
Table Load Capacity	1,200 kg (2,645 lb)
X-Axis Travel	900 mm (35.4 in)
Y-Axis Travel	900 mm (35.4 in)
Z-Axis Travel	900 mm (35.4 in)
Spindle Speed	10,000 RPM (12,000 RPM option)
Spindle Taper	BT50 / CAT50
Spindle Motor Power	50 kW (67 hp)
Tool Capacity	80 tools (ATC)
Pallet Count	2 pallets (standard)
B Axis Indexing	1° increments (0.001° optional)
Rapid Traverse Rate	60 m/min
Positioning Accuracy	± 0.002 mm
CNC Control	Fanuc 31iB
Machine Weight	~30,000 kg (66,138 lb)

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

Strengths & Limitations

Strengths

50 kW spindle provides the power required for aggressive roughing of large cast iron and steel automotive powertrain components
Box-in-box structural design provides higher rigidity than standard column configurations for heavy HMC applications
1,200 kg pallet load capacity handles heavy fixtures and large automotive castings common in production machining
80-tool ATC supports complex prismatic part programs with large tooling sets for multiple operations
± 0.002 mm positioning accuracy exceeds many competitors in the 630mm HMC class

Limitations

$700K-$950K pricing is above mid-market competitors — requires application value justification over Doosan or Hyundai WIA alternatives
OKK's North American service presence is limited — important consideration for facilities outside major metro areas
30,000 kg machine weight requires heavy foundation engineering and substantial site preparation time
OKK brand recognition in North America is lower than Makino, Mazak, or Okuma — affects resale value

Best For

Japanese tier-1 automotive suppliers operating to Japanese OEM quality systems that specify OKK as an approved production machine Aerospace subcontractors machining large structural components in aluminum and titanium requiring HMC 4-face access and ± 0.002 mm accuracy Automotive powertrain manufacturers grinding large transmission cases and engine block components in grey iron requiring 50kW spindle power Precision industrial manufacturers producing large hydraulic valves, pump housings, and industrial gear housings requiring multi-face machining

Frequently Asked Questions

01 How does OKK compare to Makino and Mazak in the 630mm HMC segment?

OKK, Makino, and Mazak all target similar applications in the 630mm HMC class. Makino (a81nx) is the performance reference with the strongest North American service network. Mazak (HCN-6800) offers MAZATROL conversational programming that reduces setup time for complex programs. OKK (HM 630) is positioned between mid-market Asian brands and the premium Makino/Mazak tier, offering Japanese precision manufacturing quality with competitive pricing versus Makino. For shops already familiar with OKK in Japan or with Methods Machine Tools support nearby, the HM 630 is a strong alternative.

02 What is the 80-tool ATC configuration on the HM 630?

The HM 630's 80-tool automatic tool changer uses a chain-type magazine holding 80 BT50/CAT50 toolholders. This capacity enables complex prismatic part programs with multiple roughing and finishing tools for each machined feature without mid-cycle tool shortages. For automotive transmission case machining with 40-60 unique tool positions, 80 tools provides adequate capacity without requiring manual tool exchanges during the production cycle.