Hengstler hollow hub shaft absolute rotary encoders have body sizes of 58mm diameter. Unlike through shaft encoders the rotating shaft is completely enclosed within the casing therefore the shaft will be restricted to a maximum length. The housing of the encoder is secured via a spring tether or stator coupling and the rotating shaft is secured in most examples by means of a clamping ring and set-screw. Typical hub shaft sizes are between 9.52mm and 12mm with protection class ratings of up to IP64. Single turn and multi-turn options can be produced with a choice of fieldbus interfaces, such as PROFIBUS, DeviceNet, SUCOnet, Interbus, EtherCAT, CANlayer2 and CANopen, the full list is shown below. High resolutions are available for both single turn and multi-turn versions. See individual data sheets for exact product specifications. Hollow hub shaft rotary absolute encoders are RoHS compliant, UL approved and CE marked.