Full definition
Cylinder receiving pressure on one side of the piston only; return is by internal spring (compression type) or gravity. Advance force = P × A − F_spring. Lower air consumption than double-acting. Stroke limited by spring length: typically maximum 100-200 mm. Standards ISO 6432 (mini, Ø 8-25 mm), ISO 15552. Uses: workpiece clamping, ejectors, light assembly pressing. Brands: Festo (ESNU/DSN), SMC (CJP/CDQ2), Parker (P1A), Norgren (RM/C series).