72A plastic gear spindle gear straight teeth 7 teeth hole inner diameter 1.95mm 0.5 mold toy accessories motor gear (4pcs)

72A gear: 7 teeth, 2A means it fits tightly with a shaft with a diameter of 2MM. The hole diameter is about 1.95 mm
0.5 means module, the module of this gear is 0.5
Calculation formula of outer diameter of gear: Outer diameter = (number of teeth 2) * 0.5

72A gear
Gear outer diameter: 4.5mm,
The outer diameter of the extended part: 3.4mm, this part has a hole for inserting the shaft.
Overall length: 5.5mm,
Gear height is 2.8mm