SMC 11-CDJ2M16-75Z-M9NVM-B | Clean Room Air Cylinder CJ2 Series 16mm Bore 75mm Stroke Double-Acting Metal Seal Auto-Switch Mounted

The SMC 11-CDJ2M16-75Z-M9NVM-B is a clean room specification air cylinder from the CJ2 series with metal seal and pre-mounted auto-switch. Part number decoded: CDJ2 = CJ2 series double acting, M = metal seal piston (as opposed to rubber seal), 16 = 16mm bore, 75 = 75mm stroke, Z = clean room auto-switch groove, M9NVM = pre-mounted auto-switch (solid state, specific output type with VM voltage option), B = cable/connector option.

The M (metal seal) designation is significant for demanding clean room environments. Metal seal pistons use a metallic ring that creates a contact seal against the cylinder bore surface, compared to elastomer seals used in standard cylinders. Metal seals virtually eliminate particle generation from seal wear, as elastomer degradation is a primary source of internal particle contamination. The trade-off is slightly higher air leakage past the seal compared to rubber, but in Particle Grade 1 clean rooms where particle counts are critical, metal seals are the preferred choice.

The CDJ2M16-75Z-M9NVM-B comes with a factory-mounted M9NVM auto-switch for position sensing. For rubber seal at the same bore and stroke, the CDJ2B16-75Z provides lower cost with higher internal sealing but more particle generation potential. For metal seal in the compact CQ2 form factor, the CDQ2 M-type variants are available. The 16mm bore metal seal generates slightly less effective force than rubber seal due to increased internal leakage, but maintains superior clean room particle performance. Clean series (11-) fluorine grease. RoHS compliant.