Okuma GP-GA26W

Est. $200,000 - $280,000 Specs verified 2026-10-03 · okuma.com Updated 2026-10-03

Image: d30jruhmdicmo0.cloudfront.net, Okuma

Key Specifications

max grinding diameter

200 mm (7.87 in)

distance between centers

400 or 650 mm (15.75 or 25.59 in)

grinding wheel size

610 × 254 mm (24 × 10 in)

rapid traverse x

30 m/min (1,181 ipm)

rapid traverse z

20 m/min (787 ipm)

workhead center

MT5

How much does the Okuma GP-GA26W cost?

Estimated price range

Est.$200,000 - $280,000

Our best estimate for a cnc grinding machine in this class — not a quote from Okuma. Configuration moves it a long way.

Overview

The Okuma GP-GA26W is the large-wheel version of Okuma's compact W cylindrical grinder. Its wheel is listed at 610 × 254 mm (24 × 10 in), on a machine whose maximum grinding diameter is 200 mm (7.87 in), so the wheel is about three times the diameter of the largest part it will ever meet.

That ratio is the reason to choose it. The GP-GA25W has the same capacity, the same 150 mm (5.9 in) wheel width and the same motor choices, but a 508 × 203 mm wheel. A 610 mm wheel carries more usable abrasive between its new and worn-out diameters, so it runs longer before a wheel change, and its longer arc of contact with a small workpiece spreads the cut over more grains. Both count when hardened shafts are ground in volume and every wheel change stops output.

The same wheel size appears on the GP-GA-36FII, a 300 mm (11.81 in) machine with 15 kW (20 hp) as its standard motor. Here the wheel is driven by 7.5 kW (10 hp), or by 15 kW (20 hp) if the option is taken. With a 150 mm face that is a point to settle early, because a full-width plunge loads the motor in proportion to the width in contact.

Around the wheel, the machine is short and quick. Center distance is 400 or 650 mm (15.75 or 25.59 in), rapid traverse is 30 m/min (1,181 ipm) in X and 20 m/min (787 ipm) in Z, and the workhead center is MT5.

Full Specifications

Parameter	Value
Max Grinding Diameter	200 mm (7.87 in)
Distance Between Centers	400 or 650 mm (15.75 or 25.59 in)
Grinding Wheel Size	610 × 254 mm (24 × 10 in)
Rapid Traverse X	30 m/min (1,181 ipm)
Rapid Traverse Z	20 m/min (787 ipm)
Workhead Center	MT5
Rapid Traversex	30
Rapid Traversez	20
Wheel Spindle Motor	7.5 [15] kW (10 [20] hp)
Grinding Wheel Width	150 mm (5.9 in)

Specifications sourced from okuma.com — verified 2026-10-03

Strengths & Limitations

Strengths

610 × 254 mm (24 × 10 in) wheel, against 508 × 203 mm on the GP-GA25W, for longer runs between wheel changes
A 150 mm (5.9 in) wheel width covers wide journals in one plunge
Rapid traverse of 30 m/min (1,181 ipm) in X and 20 m/min (787 ipm) in Z
Optional 15 kW (20 hp) wheel spindle motor in place of the standard 7.5 kW (10 hp)

Limitations

Work is limited to 200 mm (7.87 in) in diameter and 650 mm (25.59 in) between centers
The standard 7.5 kW (10 hp) motor is half the rating the GP-GA-36FII fits as standard to the same wheel size
Only two center distances, 400 or 650 mm (15.75 or 25.59 in), are listed

Best For

Long production runs where a 610 × 254 mm (24 × 10 in) wheel extends the time between wheel changes Hardened shafts up to 200 mm (7.87 in) in diameter Plunge grinding of journals up to 150 mm (5.9 in) wide

Frequently Asked Questions

01 Why choose the GP-GA26W over the GP-GA25W?

For the wheel. The GP-GA26W lists a 610 × 254 mm (24 × 10 in) wheel where the GP-GA25W lists 508 × 203 mm (20 × 8 in). A larger wheel lasts longer between changes and holds its form longer between dressings on small work. Capacity, wheel width, rapid traverse and motor ratings are the same in the headline figures.

02 Does the larger wheel come with a larger motor?

Not as standard. The wheel spindle motor is 7.5 kW (10 hp), with 15 kW (20 hp) listed as an option. The wheel is 150 mm (5.9 in) wide, so for wide plunges the optional motor is the safer specification.

03 What size parts can the GP-GA26W grind?

Parts up to 200 mm (7.87 in) in grinding diameter, on a bed with either 400 or 650 mm (15.75 or 25.59 in) between centers. The workhead center is MT5. Okuma's headline table does not give a maximum work weight or a workhead speed range.

04 How does the GP-GA26W relate to the GP-GA-36FII?

They share a wheel size. The GP-GA-36FII also lists a 610 × 254 mm (24 × 10 in) wheel, but on a 300 mm (11.81 in) grinding diameter with center distances up to 1,500 mm (59.05 in) and slower rapids of 10 m/min (394 ipm) in X. The GP-GA26W is the smaller, faster machine for short parts in volume.