Used Okamoto ACC350II Surface Grinder
Author：JINYI Date：2026-06-29
The Okamoto ACC350II is a compact precision surface grinder that has earned a strong reputation in toolrooms and small-part production environments. This 2016 Japanese-built unit — stock number 812461 — is located in China and available for immediate inspection. With a magnetic chuck size of 350×150 mm, a maximum wheel speed of 40 m/s, and wheel capacity up to 205 mm outer diameter, it's aimed at shops that require accurate flatness, fine finishes, and the flexibility to handle parts ranging from automotive inserts to medical device components. If your operation needs a single grinder that reliably tackles diverse workpieces, this machine warrants serious consideration.
Stock Status and buying value
This Okamoto ACC350II is in stock and available for inspection in China. As a pre-owned 2016 model, it strikes an attractive balance between modern precision and capital savings. There's no long lead time or factory order queue — the unit can be evaluated, purchased, and shipped quickly. For procurement managers who need to plug a production gap without waiting months for a new machine, immediate availability is a clear advantage. Stock number 812461 identifies this exact machine, and all specifications below correspond to this individual unit.
Buyers can inspect the grinder under power (subject to prior arrangement) to confirm condition before committing. This level of transparency reduces commercial risk and lets production engineers assess whether the ACC350II fits their process from day one.
Key Specifications and Production Readiness
The ACC350II's configuration is straightforward but critical for quality surface grinding. Below are the main technical parameters, put into a production context:
Magnetic chuck 350 × 150 mm
Max wheel OD 205 mm
Max wheel width 25 mm
Wheel bore 31.75 mm
Max peripheral speed 40 m/s
Country of origin Japan
Year 2016
Magnetic chuck 350×150 mm – This defines the direct workholding area. Parts up to approximately 350 mm in length and 150 mm in width can be ground in a single clamping. In practice, this accommodates mould inserts, die plates, shims, bearing spacers, and small fixture plates. For many small- to medium-sized precision components, this envelope hits the sweet spot: large enough for typical toolroom work yet compact enough to fit limited floor space.
Grinding wheel capabilities – The machine takes wheels with an outer diameter up to 205 mm, a maximum width of 25 mm, and a standard 31.75 mm bore. The 25 mm wide wheel is ideal for producing clean, flat surfaces on narrow faces, shoulders, and pockets. The 40 m/s peripheral speed allows effective use of modern ceramic and CBN wheels, delivering consistent surface finishes even in hardened materials. This combination lets the ACC350II switch between roughing and finishing with a simple wheel change.
Japan-built, 2016 – Japanese origin signals the characteristic Okamoto attention to spindle and guideway quality. A 2016 machine is still relatively recent in the used market; assuming reasonable maintenance, it can deliver many years of precision grinding before any major overhaul is needed.
Frequently Asked Questions
Is this used Okamoto ACC350II surface grinder available for inspection right now?
Yes. The machine is in China and can be inspected by appointment. We encourage buyers to verify condition in person before finalising a purchase.
What type of parts can the Okamoto ACC350II surface grinder handle?
It's designed for small precision flat parts — mould inserts, die plates, shims, medical components, electronic connector tooling, aerospace pads, and many toolroom workpieces. The 350×150 mm chuck accommodates a wide variety.
Does the machine come with a grinding wheel?
Typically, used surface grinders are sold without wheels unless otherwise agreed. Please enquire about the current tooling status for stock #812461.
What does the 40 m/s peripheral speed mean for my production?
A 40 m/s wheel speed supports modern high-performance wheels, delivering better surface finishes and efficient stock removal. It also gives you flexibility to use different abrasive types for various materials.
Can this machine grind hardened tool steel and stainless steel?
Yes. With the appropriate wheel, the ACC350II handles hardened tool steels, stainless alloys, and titanium — the materials commonly found in mould making and medical device work.
What should I check before buying a used Okamoto surface grinder?
Focus on spindle runout, magnetic chuck flatness, table travel smoothness, wheel flange condition, and any coolant system leaks. Our Inspection Points Before Purchase section above details these checks.
Why choose a 2016 Okamoto ACC350II instead of a new machine?
A 2016 unit retains the well-regarded Japanese build quality at a fraction of new cost, with immediate availability. It's a pragmatic choice for shops that want precision without a capital-intensive new machine purchase.
Can this machine be shipped internationally?
Yes, shipment can be arranged to most destinations. The machine is currently in China. We can provide a freight quote and estimated transit time based on your location.
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