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Prod. no.  55

with tapped hole of 1/4" - 20 tpi
Plate keepers protecting and retaining  magnetic field




Code Diameter Height
  inch mm inch mm
RPM/175 11/16 17.5 5/8 15.8
RPM/205 13/16 20.5 3/4 19.0
RPM/270 1-1/16 27.0 1-3/16 25.4
RPM/350 1-38/8 35.0   30.0