You searched for "parallel bore"
Igus
Igus Iguform S270 42 Teeth Spur Gear, 0.5 Module, 4mm Bore Diam, 21mm Pitch Diam, 12.2mm Hub Diam
Part: S270GM-ST-050-042-00-040-R
Fine-pitch plastic spur gear for precision industrial machinery applications.
Igus
Igus Igutek P360 45 Teeth Spur Gear, 0.5 Module, 4mm Bore Diam, 22.5mm Pitch Diam, 12.2mm Hub Diam
Part: P360GM-ST-050-045-00-040-R
Compact plastic spur gear for small machinery and light power transmission.
Igus
Igus Iguform S270 45 Teeth Spur Gear, 0.5 Module, 4mm Bore Diam, 22.5mm Pitch Diam, 12.2mm Hub Diam
Part: S270GM-ST-050-045-00-040-R
Compact plastic spur gear for precision light machinery and small equipment drives.