The Synchro Tapper model ST4 is a compact tapping unit. The ST4 utilizes an AC servo motor and provides mechanical feed with electricronic programable control. It is a powerfull unit with capacity to tap large holes such as an M27 in aluminum.


  • This model is using the PC-038 type programming console and PC software for the easy setting of stroke and rotating speed, (same as “Selfeeder Varimec”).
  • A second reference point allows for greatly reduced recycle time.
  • 99 programs can be set for stroke and rotating speed.


  • Tapping capacities are for spiral tap and point tap (upper part) and for hand tap 2 (lower part) based on the depth of tapping being limited to 1.5 times of the tap diameter.
  • Rotating speed is decided by the material, taping diameter and tapping speed etc.
  • The adequate feed gear shall be selected for the tapping pitch.
  • Please ask us about the feed speed for tapping and the one for fast feed as those are varying for a tapping pitch and a rotating speed.
    Maximum recommended weight when using
Model #Motor Type Max. Rotating Speed for Tapping (rpm) Max. Stroke (mm) Driving Force Weight (kg) Tapping Capacity
ST4-420Induction Motor 550 120 2.7 kW AC servo motor 62 Aluminium M27 Steel M20