Sprockets might be classified into conventional sprockets, HK sprockets together with other sprockets.
1. Standard sprocket
Standard sprockets are ANSI sprockets which might be engaged with standard series roller chains. See P125 for dimensions.
You will find two varieties of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets can be engaged with HK series roller chains, and these for single strand chains are identical to typical sprockets. On the other hand, sprockets for numerous strand chains are distinct from typical sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are made according on the following calculation formulas to suit respective specialty chains.
The sprockets used to the following chains are the exact same as the common sprockets in tooth gap form, but diverse in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of common sprockets and also other basic sprockets are calculated as follows. To start with, the diameters of sprockets are calculated from the following calculation formulas.
Subsequent, sprocket tooth profile (the form on the tooth determined by its thickness) is calculated from the following calculation formulas. (The values shown from the following pages have been calculated by these formulas and regarded as the 
normal values.)
Calculation formulas for diameters and tooth gap varieties Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The essential dimensions of the sprocket appropriate for a chain pitch of 1 mm are respectively known as pitch diameter aspect, tip diameter factor and caliper diameter aspect. The respective aspects for respective numbers of teeth are listed under. If these elements are multiplied by chain pitch, the basic dimensions in the corresponding sprocket may be obtained.
Instance:
Within the situation of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter component
Calculation formulas for tooth gap varieties
Because the most rational tooth gap forms during which the stress angle modifications in response for the elongation of the smoothly rotated roller chain using the lapse of services time, ANSI specify two types of tooth profiles: U-type and S-type. In general, S-type tooth profiles are adopted in accordance with ANSI, and our common sprockets also have S-tooth profiles.