12A 1-2-3 Plate wheel Sprocket

The term "12A 1-2-3 Plate Wheel Sprocket" follows a similar pattern as the previous examples but with a different pitch size.

In this case, "12A" indicates that the sprocket has a pitch size of 12mm.

The "1-2-3 Plate Wheel" refers to the structure of the sprocket. It consists of three plates or tiers stacked on top of each other, with each plate having a different number of teeth. The first plate has one tooth, the second plate has two teeth, and the third plate has three teeth.

This design allows for various Gear ratios, providing options for speed reduction or torque amplification in mechanical systems.

In summary, the term "12A 1-2-3 Plate Wheel Sprocket" describes a sprocket with a pitch size of 12mm and three stacked plates, each with a different number of teeth.
platewheels 3/4”  X7/16”