Nice SD Série Instructions Et Avertissements Pour L'installation Et L'utilisation page 11

DIMENSIONED DRAWINGS OF GEARMOTORS FOR SECTIONAL DOORS
Gearmotors with cable release device
SD-100-24-E
SD-120-20-E
SD-140-20-E
When assembling gearmotors with 31.75 mm
diameter shaft from the left, the tab is to be blocked
only with a fixing ring because using a screw could
break the shaft.
Only with the 0.55­20 gearmotors
Hollow shaft diameter: 25.4 or 31.75 mm.
English – 9