Applications - Plastic Crown Gears suit for science DIY projects such as RC model car, model electric robot, education such as displaying how gear rates work, and any other family small motor DIY project.
More Choose - Our store have the most complete gears shown in the following description, which can meet your DIY needs.
Package Content - 30pcs Plastic Gears White 10 Teeth Model 102A Reduction Gear Plastic Worm Gears for RC Car Robot
1. The first two digits encoding: the number teeth of externally toothed gear. 2. The encoding three or four numbers: the number of internal gear teeth. 3. coding fifth digits: the pore size of the gears. 4. Last encoded in English: A: tight B: loose . 2A indicates that the central axis is 1.95mm; it is tightly fitted with the optical axis of 2mm and rotates together with the optical axis. 2B indicates that the central axis is 2.05 mm; with the optical axis of 2 mm, it is loosely fitted and is free to rotate on the optical axis. For example: Size of 44102B: 44 external teeth, 10 internal teeth, 2MM aperture, loose axle. Gear diameter: (44+2)X 0.5(MM)=23MM Gear outer diameter is 23MM