OKK Corporation Horizontal Machining Centers

OKK HM6000S

$350,000 - $500,000 Updated 2026-03-14

Key Specifications

X Travel

1,000 mm (39.4 in)

Y Travel

900 mm (35.4 in)

Z Travel

900 mm (35.4 in)

Spindle Taper

BT50

Tool Capacity

40 tools (60 or 80 optional)

Rapid Traverse

48 m/min (1,890 ipm)

Overview

The OKK HM6000S is a mid-size horizontal machining center that hits the sweet spot between capability and footprint for production shops machining medium-sized parts in steel, cast iron, and aluminum. With a 630 mm (24.8 in) pallet and 1,000 x 900 x 900 mm (39.4 x 35.4 x 35.4 in) X/Y/Z travel, the HM6000S handles the bread-and-butter workpieces found in automotive suppliers, hydraulics manufacturers, and general production environments — valve bodies, manifold blocks, transmission housings, and mid-size die components.

OKK's signature construction approach is fully evident in the HM6000S. The column and bed use heavily ribbed Meehanite cast iron castings with box guideways on the Y and Z axes for damping and rigidity where it counts most. The X-axis uses roller guides for faster table positioning. This hybrid guideway approach gives the HM6000S the cutting rigidity of a box-way machine with rapid traverse speeds (48 m/min) that keep cycle times competitive with linear guide competitors.

The BT50 spindle delivers 22 kW (30 HP) of continuous power at speeds up to 10,000 rpm with a 2-speed gear head. The gear drive provides the high torque needed for aggressive face milling with large-diameter inserted cutters and heavy boring with long-reach bars. The 2-pallet APC comes standard, and the 40-tool ATC (60 or 80 optional) supports complex multi-operation parts. Through-spindle coolant at 70 bar is standard, with higher-pressure options available.

Positioning accuracy is +/-4.0 microns with repeatability of +/-2.0 microns — solid production specs that satisfy most general-purpose horizontal machining requirements. The Fanuc 31i-B control provides full 4-axis simultaneous capability through the B-axis. The HM6000S competes favorably with the Mazak HCN-6800, Okuma MA-600HII, and Toyoda FH630SX in the mid-size HMC segment. OKK typically wins on cutting rigidity and build quality, while competitors may edge ahead on speed and automation options.

Full Specifications

Parameter	Value
X-Axis Travel	1,000 mm (39.4 in)
Y-Axis Travel	900 mm (35.4 in)
Z-Axis Travel	900 mm (35.4 in)
Pallet Size	630 x 630 mm (24.8 x 24.8 in)
Max Pallet Load	1,200 kg (2,646 lb)
Spindle Speed	10,000 rpm (2-speed gear head)
Spindle Taper	BT50
Spindle Motor	22 kW (30 HP) continuous
Spindle Torque	500 N-m (369 ft-lb) at low range
Positioning Accuracy	+/-4.0 um
Repeatability	+/-2.0 um
Rapid Traverse Rate	48 m/min (1,890 ipm)
Tool Capacity	40 tools (60 or 80 optional)
B Axis Indexing	0.001 degree minimum
Guideway Type	Box guideways (Y/Z axes), roller guides (X axis)
CNC Control	Fanuc 31i-B
Machine Weight	17,000 kg (37,479 lb)
Pallet Changer	2-pallet APC standard

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

Strengths & Limitations

Strengths

Hybrid box/roller guideway design delivers excellent cutting rigidity while maintaining competitive rapid traverse speeds
22 kW gear-drive BT50 spindle with 500 N-m torque handles aggressive roughing in steel and cast iron
630 mm pallets with 1,200 kg load capacity handle the majority of mid-size production workpieces
1,000 x 900 x 900 mm travel provides generous envelope for multi-face machining of medium-sized parts
OKK's overbuilt construction philosophy ensures the machine maintains accuracy over years of three-shift production
Competitive pricing for the rigidity class delivers serious cutting capability below $500,000

Limitations

10,000 rpm spindle speed is adequate but falls behind 15,000 rpm options available from some competitors
OKK brand recognition in North America is lower than Mazak, Okuma, or Makino, potentially affecting resale value
40-tool standard ATC may need upgrading for complex parts requiring extensive tooling
17,000 kg machine weight requires proper foundation preparation
Automation and pallet pool options may be less extensive than what Mazak or Makino offer for the same size class

Best For

Automotive tier suppliers machining transmission housings, brake calipers, and steering components in production volumes Hydraulics manufacturers producing valve bodies, manifold blocks, and pump housings in steel and cast iron General job shops needing a reliable mid-size HMC for mixed production work on medium-sized parts Die and mold shops using horizontal machining for roughing and semi-finishing die components Production environments where cutting rigidity and machine longevity are more important than maximum spindle speed Shops looking for strong value in a mid-size HMC that outperforms its price class on heavy cutting capability

Frequently Asked Questions

01 What does an OKK HM6000S cost?

New HM6000S machines typically price between $350,000 and $500,000 depending on tool capacity, options, and automation. This represents competitive pricing for a machine with box guideway construction and gear-drive spindle in this size class.

02 How does the HM6000S compare to the Mazak HCN-6800?

The Mazak HCN-6800 offers higher spindle speeds, faster rapids, and a broader automation ecosystem. The OKK HM6000S provides greater cutting rigidity through its box guideway Y/Z construction and gear-drive spindle. For heavy steel and cast iron cutting, the OKK often outperforms; for high-speed aluminum and lighter cutting, the Mazak has advantages.

03 Can the HM6000S be automated with pallet pools?

Yes. While the standard configuration includes a 2-pallet APC, the HM6000S can be integrated with linear pallet pool systems for high-volume production. OKK and third-party automation providers offer pallet pool solutions with 4, 6, or more pallets.

04 What is the advantage of the gear-drive spindle?

The 2-speed gear head provides 500 N-m of torque at low RPM — significantly more than a comparably powered direct-drive spindle. This high torque enables aggressive face milling with large-diameter cutters and heavy boring operations without stalling or losing RPM under load.

05 Who provides service for OKK machines in North America?

Methods Machine Tools is OKK's primary North American distributor, providing sales, applications support, service, and spare parts through their network of technology centers across the United States.