The direct assembly cylinders are characterised by a design that is easily, space saving and universally fastened.. They are economical, small constructed pneumatic cylinders, which are available with and without anti-twist lock. The cylinders are equipped with a magnet piston, which can be used for a position request using cylinder switches. The cylinders do not require any fastening material, since they are provided with female threads and/or through holes on all 6 sides and thus enable a direct, space saving assembly. The main mounting dimensions are identical to SMC pneumatic cylinders of series CDU and CDUK. Thus these double acting cylinders can replace SMC cylinders in most applications.