A special note to gear purchasers for non-model aircraft purposes. We get many inquirys about asking if these gears will fit a Childs X-G-Wiz-Go toy or will repair a home kitchen device or etc. We are model aircraft experts, if it's a model aircraft gearbox, we can help figure out the part on the phone if your stuck. If it's a toy or special project outside the hobby, I can't begin to guess if our gear will mesh with your gear in your device. I can't tell from a photo what pitch your gear is. If your trying to fix a special item, my best suggestion is to purchase all the gears that look similar and have a go at it. Most gears are a few dollars or less.
Precision Pinion Gear compatible with GWS S-400 gears and our #1 and #2 Gearbox. Locks to shaft by means of set-screw.
Specifications:
Tooth Count
Module
Face Width
Bore ID
OD
Material
20
.4
.160" (4.06mm)
2.3mm (.09")
8.8mm
Brass
SKU Number: RRC20T23BSS
2mm Pinion Gears for RC Gearboxes
The pinion is the small drive gear that presses onto a motor shaft and turns the larger spur gear inside a gearbox. This category collects press-on pinion gears bored for a 2.0mm shaft, the size common to many small geared power systems.
Choosing a Tooth Count
Pinions here run through a range of tooth counts, including 10T, 12T, 14T, 16T, 18T, and 20T versions. The tooth count you pick sets the reduction ratio against the spur gear: fewer teeth trade top speed for more torque, while more teeth do the opposite.
Press-On Fit
Each of these pinions uses a 2.0mm inner diameter press-on fit, so it slides onto the motor shaft without a set screw. A snug press keeps the gear aligned and reduces the chatter that comes from a loose fit.
Find the tooth count that suits your gearing in the listings below.
 "Pinion Gear 10T/2.3 I.D. Press On")
 "Pinion Gear 12T/2.3 I.D. Press On")
 "Pinion Gear 14T/2.3 I.D. Press On")
 "Pinion Gear 16T/2.3 I.D. Press On")
 "Pinion Gear 18T/2.3 I.D. Press On")
 "Pinion Gear 20T/2.3 I.D. Press On")
