Siemens SINUMERIK 808D ADVANCED Programming And Operating Manual page 76

See the following illustration for external and internal thread with cylindrical thread:
Right-hand or left-hand thread
Right-hand or left-hand thread is set with the rotation direction of the spindle (M3 right, M4 left). To do this, the rotation value
must be programmed under address S or a rotation speed must be set.
Programming
Remark: Run-in and run-out paths must be taken into account for the thread lengths.
See the following illustration for programmable values for the thread with G33:
Programming and Operating Manual (Turning)
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6FC5398-5DP10-0BA2, 06/2015