SMC 10-CM2B20-25Z | Clean Room Standard Air Cylinder CM2 Series 20mm Bore 25mm Stroke Double-Acting Single Rod Round Body Auto-Switch Ready

The SMC 10-CM2B20-25Z is a clean room specification standard air cylinder from the CM2 series with a 20mm bore and 25mm stroke. Part number decoded: CM2 = standard round body air cylinder (stainless steel tube), B = basic mount, 20 = bore mm, 25 = stroke mm, Z = auto-switch mounting groove. The CM2 is SMC's workhorse standard cylinder platform, and the 10- clean series prefix delivers fluorine grease, controlled assembly, and anti-static packaging for particle generation grade 1 environments.

The CM2 series differentiates from the CJ2 by offering larger bore sizes and stainless steel tube construction for improved corrosion resistance versus aluminum CJ2 cylinders. The 20mm bore delivers approximately 188N at 0.6 MPa through a short 25mm stroke, making this a short-throw, moderate-force actuator ideal for clamping, pressing, short-push operations, and indexing applications in clean room automation. The short throw minimizes cycle time for high-throughput operations. The basic (B) through-hole mounting provides straightforward installation, and the auto-switch groove (Z) supports SMC D-series switches for position sensing.

The CM2B20-25Z provides short-stroke actuation at 20mm bore. For longer strokes at 20mm bore in the CM2 family, options include CM2B20-50Z (50mm), CM2B20-75Z (75mm), and CM2B20-100Z (100mm). For front flange mounting, specify CM2F20 instead of CM2B20. For the same bore in a compact square body, the CDQ2B20 saves mounting height but may have stroke limitations. Clean series (10-) fluorine grease, Particle Grade 1. CM2 bores range from 20mm to 40mm. RoHS compliant. Compatible with SMC D-series auto switches and AS speed controllers.