1、High quality aluminum alloy material can make sure the durability and stability of the product 2、The front and rear covers are screwed to the cylinder tube, which is tight and will not fall off easily. 3、The piston sealing adopts a special-shaped two-way sealing structure, compact appearance and has oil storage function. 4、The front end cover is guided by self-lubricating bearings, which has good lubrication and guiding performance. 5、Adopt double action mode and fixed buffer form, available in three styles for choice Item Type: Air Cylinder Model: SDA40 Main Material: Aluminum Alloy Working Medium: Air Working Pressure: 0.15-0.8mpa Guaranteed Pressure Resistance: 1.5MPa（215Psi） Buffer Form: Fixed Buffer Mode of Action: Double Action Buffering Method: Anti-Collision Pad Stroke: 10/15/20mm Temperature: 4℉-176℉ (-20℃-80℃)SDA40X10: Double Side: Dia. 10 Tooth M8x1.25 Hole: Dia. 6.5 Piston Rod Diameter: 16 Piston Rod Inner Teeth: M8x1.25 Deep 12 Hole Distance: 19 Air Inlet Thread: PT1/8 Total Cylinder Length: 43 Cylinder Length: 36SDA40X15: Double Side: Dia. 10 Tooth M8x1.25 Hole: Dia. 6.5 Piston Rod Diameter: 16 Piston Rod Inner Teeth: M8x1.25 Deep 12 Hole Distance: 24 Air Inlet Thread: PT1/8 Total Cylinder Length: 48 Cylinder Length: 41SDA40X20: Double Side: Dia. 10 Tooth M8x1.25 Hole: Dia. 6.5 Piston Rod Diameter: 16 Piston Rod Inner Teeth: M8x1.25 Deep 12 Hole Distance: 29 Air Inlet Thread: PT1/8 Total Cylinder Length: 53 Cylinder Length: 46 1 x Air Cylinder