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Solid‐shaft encoders need a mounting flange and coupling. Hollow‐shaft encoders only need a spring tether to prevent the rotational movement of the encoder and absorb vibration.
Both types are encoder versions with stainless-steel housings.
The "61" types are fitted with a solid, rugged stainless‐steel cover connected to the stainless‐steel flange. Standard cable fittings are made of nickel‐plated brass.
=> This design allows complex encoder versions, such as absolute encoders with bus covers and types that require protected access to the interior of the encoders, (e.g. dip switches).
The "59" types include a deep‐drawn stainless‐steel cover with a crimped stainless‐steel flange connection. Standard cable fittings are made of PVC.
=> This design is generally less expensive (although offering reduced variety of encoder versions): incremental encoders with cable connections, absolute encoders with cable connection and sealed cover (e.g. singleturn parallel, SSI or Interbus‐S).