Sprockets could be classified into common sprockets, HK sprockets and also other sprockets.
1. Conventional sprocket
Conventional sprockets are ANSI sprockets which may be engaged with conventional series roller chains. See P125 for dimensions.
There are actually two kinds of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets is often engaged with HK series roller chains, and those for single strand chains are identical to typical sprockets. Even so, sprockets for multiple strand chains are diverse from normal sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are made in accordance on the following calculation formulas to suit respective specialty chains.
The sprockets applied for your following chains will be the same since the regular sprockets in tooth gap form, but diverse in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of common sprockets along with other common sprockets are calculated as follows. In the beginning, the diameters of sprockets are calculated through the following calculation formulas.
Next, sprocket tooth profile (the form from the tooth dependant upon its thickness) is calculated through the following calculation formulas. (The values proven inside the following pages had been calculated by these formulas and regarded as the normal values.)
Calculation formulas for diameters and tooth gap kinds Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The essential dimensions of the sprocket suitable for a chain pitch of 1 mm are respectively known as pitch diameter aspect, tip diameter component and caliper diameter component. The respective factors for respective numbers of teeth are listed under. If these things are multiplied by chain pitch, the essential dimensions from the corresponding sprocket may be obtained.
Instance:
Within the situation of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter component
Calculation formulas for tooth gap kinds
As the most rational tooth gap forms during which the pressure angle modifications in response for the elongation of a smoothly rotated roller chain with the lapse of services time, ANSI specify 
two sorts of tooth profiles: U-type and S-type. Usually, S-type tooth profiles are adopted in accordance with ANSI, and our normal sprockets also have S-tooth profiles.
