None of them replaces our engineer — they’re for quick orientation and to prepare a request with real numbers, not guesses.
Build a simple pneumatic system sketch from symbols (compressor → FRL → valve → cylinder) and send it with your request.
Force, air consumption (+ pressure effect), leakage cost, speed, ISO 8573-1 air-quality classes — all with an honest rule-of-thumb caveat.
Does an SMC, Festo, Camozzi or Airtac part fit in place of another brand? ISO mounting standards, how to measure a cylinder, and where threads NEVER match.