Compact cylinder ISO 21287

ISO 21287 compact cylinders are standardised pneumatic actuators designed for space-constrained industrial automation applications where conventional cylinders cannot fit. These cylinders feature reduced overall dimensions while maintaining full force output, making them essential for packaging machinery, assembly automation, and pick-and-place systems in automotive, food processing, and electronics manufacturing. The compact design enables installation in tight spaces between conveyor systems, robotic cells, and production line equipment where every millimetre matters for system integration.

Selection of ISO 21287 compact cylinders requires matching piston diameter to force requirements, with available sizes from 32mm to 100mm bore diameter providing forces from 483N to 7854N at 6 bar operating pressure. Stroke length selection ranges from 5mm for precise positioning to 350mm for extended reach applications, as demonstrated by the Airtec NADA series offering strokes up to 350mm. Operating pressure typically ranges from 2 to 10 bar, with port connections available in G1/8 to G1/2 threading depending on cylinder bore size and flow requirements.

ISO 21287 compact cylinders must comply with the fundamental ISO 21287 dimensional standard ensuring interchangeability between manufacturers, while pneumatic safety requirements follow ISO 4414 for compressed air systems. Additional compliance includes EN ISO 13849 for safety-related control systems when integrated into machinery, and ATEX 2014/34/EU certification for explosive atmosphere applications in chemical and pharmaceutical industries. These cylinders also conform to the Machinery Directive 2006/42/EC and EMC Directive 2014/30/EU for CE marking requirements in European industrial installations.

Single-acting ISO 21287 compact cylinders like the Airtec NAEE series use compressed air to extend the piston and rely on an internal spring for retraction, requiring only one air connection and offering faster return speeds with lower air consumption. Double-acting cylinders such as the Airtec NADA series use compressed air for both extension and retraction, providing equal force in both directions and precise positioning control through two separate air ports. Single-acting variants are preferred for simple push-pull operations, while double-acting types excel in applications requiring controlled movement in both directions with consistent force output.

ISO 21287 compact cylinders require mounting surfaces machined to ±0.05mm flatness tolerance and threaded holes matching the standardised bolt circle dimensions for proper alignment and sealing. Air supply connections utilise standard metric or G-thread ports ranging from G1/8 for smaller bore cylinders to G1/2 for 100mm bore units, with recommended air line pressure drop not exceeding 0.5 bar from compressor to cylinder. The cylinders integrate with existing pneumatic control systems through standard directional control valves, flow controls, and pressure regulators, maintaining compatibility with Festo, SMC, and other major automation components.

ISO 21287 compact cylinders typically operate within temperature ranges of -20°C to +80°C for standard applications, with specialized high-temperature variants reaching +150°C for specific industrial processes. Operating pressure ranges from 2 to 10 bar working pressure with proof pressure testing at 15 bar and burst pressure ratings exceeding 30 bar for safety margin compliance. Standard units provide IP40 protection rating against solid particles, while sealed variants offer IP65 protection for harsh environments with water spray and dust exposure common in food processing and packaging applications.

ISO 21287 compact cylinders require visual inspection every 500,000 cycles or annually, whichever occurs first, with seal replacement typically needed after 2-5 million cycles depending on operating pressure, temperature, and contamination levels. Service life expectancy reaches 10-20 million cycles under normal industrial conditions with filtered, lubricated air supply and proper mounting alignment. Maintenance procedures include checking mounting bolt torque to specification, verifying seal integrity through pressure decay testing, and replacing worn seals using manufacturer-approved seal kits to maintain performance and safety compliance throughout the operational lifecycle.