The Series 167 is Aventics' legacy ISO 6431 standard cylinder line — a long-running profile cylinder family that established interchange dimensions for European pneumatic actuation. Bores cover 32 mm through 200 mm with metric strokes, magnetic piston sensing, and the ISO 6431 mounting interchange standard predating ISO 15552. The 167 platform remains an active production option for facilities standardized on this earlier ISO geometry, with full spare parts and service kit support.