Reference Library › Grinding › GI-20NII

Reference recordMBB·GRINDING/OKUMA-GI-20NIIUpdated 2026-10-10

Photo: Okuma (manufacturer)

MakeOkuma

ModelGI-20NII

Machine typeGrinding

Bore Range - with 100mm (3.95) OD WheelØ0.20-11.81 in (Ø5-300 mm)

Max Grinding Length - 1WS/2WS7.87 in (200 mm)

Max Grinding Length - Center Rest Option11.81 in (300 mm)

Max Grinding Length - 4WS5.12 in (130 mm)

Workhead Spindle BoreØ2.76 in (Ø70 mm)

Rapid Traverse472 ipm (12 m/min)

Available Spindles:max: 40,000 rpm max: 150,000 rpm Belt Driven High Frequency

Swing in chuck guard400 ømm (15.75 øin)

Wheel motor5.5 kW (7.5 hp)

Machine size (W × D × H)2,490 × 3,023 × 1,808 mm (98.03 × 119.02 × 71.18 in)

📋 Spec data: Standard (10 fields) · compiled from manufacturer and public sources · reference updated 2026-10-15.
These specifications describe the model in general. The year, control generation, spindle, and option package of a specific unit may differ — always verify against the actual machine. Methodology · Data sources.

Okuma

GI-20NII

Evidence updated 15 October 2026: specifications. How evidence is dated

MBB Model ID MBB-M-XRYKRR · What is this?

📚 Educational reference — no pricing, not for sale. Independent used-machine research and seller-source discovery are available in our market directory.

Manufacturer videoWatch on YouTube ↗

GI-20NII CNC Internal GrinderOkuma America Corporation · 0:59 · 2013-07-01

OKUMA CORPORATION JAPAN · 0:59 · 2013-04-19↗

About the Okuma GI-20NII

The Okuma GI-20NII is catalogued under Grinding in The Machine Blue Book CNC machine reference library. This entry documents the machine for identification and education; specifications above are compiled from manufacturer and public sources and describe the model, not a specific unit.

Showroom

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Manuals & documents

All Okuma manuals and documentation →

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