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About product and suppliers:
        Alibaba.com offers 510 4mm shaft encoder products. About 51% of these are sensors. 

A wide variety of 4mm shaft encoder options are available to you, such as optical sensor, hall sensor, and current sensor. You can also choose from position sensor, magnetic sensor, and speed sensor. As well as from digital sensor, analog sensor, and switching transducer. And whether 4mm shaft encoder is free samples. 

There are 435 4mm shaft encoder suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of 4mm shaft encoder respectively. 

mm shaft encoder products are most popular in North America, Southeast Asia, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 343 with Other, 251 with ISO9001, and 13 with ISO22000 certification.