The "Blue and Improved" Original Line® cylinder with adjustable cushions features permanent grease lubrication that more than doubles the anticipated service life of this design. Cushions offer solutions to applications with destructive kinetic energy levels. Air cushions trap small amounts of exhaust air at end of stroke, providing a pocket of compressible air to decelerate loads.Bore sizes:  3/4", 1-1/16", 1-1/2", 2", 2-1/2", 3"High strength aluminum alloy porting endsBuna N "U" Cup sealsLow breakaway friction:  less than 5 PSIBlue and Improved design doubles previous cylinder lifePermanent grease lubricant requires no additional lubrication during serviceEngineering SpecificationsPressure Rating: 250 PSITemperature Range:Buna N seals: -20° F (29° C) to 200° F (90° C)Fluoroelastomer seals for high temperatures (up to 400°F) availableMagnetic piston option: max. operating temp. is 185° FMaterials:Rod: Ground and roller burnished 303 stainless steelBody: 304 stainless steelEnd Caps: 6061 aluminum (RoHS compliant)