2015S PNEUMATIC CYLINDER  2015SL PNEUMATIC CYLINDER 
Overview of 2015S vs 2015/2015D Cylinders

• Designation Code: "20" typically represents a 20mm bore size, and "15" represents a 15mm stroke length.
• 2015S: Denotes a single-acting pneumatic cylinder variant (spring return).
• 2015D / 2015: Denotes a double-acting variant (air powered in both directions). 

Key Features

• High-Strength Guide Rail: Built for smooth, precise linear motion and high load accuracy.
• Hard-Oxidized Block: Aluminum alloy body treated for enhanced surface hardness, durability, and wear resistance.
• Side-Load Tolerance: Engineered to bear larger side loads and moments compared to standard round cylinders, making it ideal for robotic grippers and manipulator assemblies. 

Could you let me know what specific application or machine you are repairing or building with this 2015S/2015 cylinder so I can help you find exact mounting dimensions, replacement seals, or compatible valves?