@c310:
…................cables or adapters to be used with standard chineese motors ....................
And thereby hangs the problem - there is no standard for Chinese steppers. Sometimes the cables are wired directly with no socket on the motor, sometimes there is a socket but as David pointed out, the pinout may differ from motor to motor.
But it's not just steppers. Sooner or later you'll need to change a heater cartridge or a thermistor or some other part and the chances are high that the replacement will have no connector, or the wrong type of connector, or the lead will be too long (or too short). There is no getting away from the fact when you start tinkering, sooner or later you'll have to start fitting your own connectors. It's not to difficult - even a 64 year old with no experience can learn how to do it 🙂