Page Comparison

The S, ZETA and ES series stepper motors were discontinued in 2022.

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All custom products based on the above parts are also discontinued, for example:

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This chart shows the ES, S, and ZETA motor with shared characteristics along with the recommended HV replacement. See the notes column and associated footnotes that summarize mechanical differences

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Notes for selecting HV as replacements

NEMA23 : ES2x, S57-xx, ZETA57-xx models

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HV23x motors have the same face mounting, shaft length and shaft diameter (0.25inch)

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S57-xx, ZETA57-xx models include a rubber boot and 9-pin connector pre-wired for a ZETA drive. ES2x and HV23 motors do not include a connector

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1. HV23x-02-10 : Double shaft with a single flat

2. HV23x-01-10 : Single shaft with a single flat

3. HV23x motors are not available with keyways

4. -E or -EC models include a 1000 lines encoder. HV23x motors can be supplied with a similar 1000ppr encoder. Request through a local distributor as a custom product.  Please note the HV motors with encoder will have a 10 piece MOQ required per shipment and so in many cases if an encoder is required, converting the system to a servo solution may be the better option.

5. HV34x-02-10 : Double shaft with a double flat

6. HV34x-01-10 : Single shaft with a double flat

7. HV34x-04-10 : Double shaft, round

8. HV34x-03-10 : Single shaft, round

9. HV34x motors are not available with keyways

10. 10. -E or -EC models include a 1000 lines encoder. HV34x motors can be supplied with a similar 1000ppr encoder. Request via Extranet Quote system, Custom Electronics

NEMA23 : ES2x, S57-xx, ZETA57-xx models

NEMA34 : ES3X, S83-xx, ZETA83-xx models

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HV34x-02-10 : Double shaft with a double flat

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HV34x-01-10 : Single shaft with a double flat

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HV34x-04-10 : Double shaft, round

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HV34x-03-10 : Single shaft, round

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HV34x motors are not available with keyways

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ZETA Systems

ZETA part numbers that do not include -MO indicate a motor plus ZETA4 drive system. For example, ZETA57-51 includes ZETA4 and ZETA57-51-MO. The ZETA4 drives were discontinued as of 2024.

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Related FAQ: S/SX Motors - Replacing S/ZETA/ES series step motors with BE servo motors

Complete List of Discontinued Parts