Ok, I found the information. I went to sherlines website and found this:

Motor Connectors:

∙ 5-pin DIN male
∙ Five to 30 volts (better performance at higher voltage)
∙ 2 amp unipolar configuration
∙ 800 steps per revolution (microstepping), equates to 16,000 steps/inch with .050" pitch leadscrew

so it is 16000 is what I need. I do have the sherline half step checked also.