Sprockets can be classified into standard sprockets, HK sprockets and various sprockets.
1. Typical sprocket
Common sprockets are ANSI sprockets 
which can be engaged with conventional series roller chains. See P125 for dimensions.
There are actually two kinds of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets is usually engaged with HK series roller chains, and those for single strand chains are identical to normal sprockets. On the other hand, sprockets for multiple strand chains are distinctive from common sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are made in accordance to the following calculation formulas to suit respective specialty chains.
The sprockets applied for the following chains will be the similar as the conventional sprockets in tooth gap form, but distinctive in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of regular sprockets together with other general sprockets are calculated as follows. In the beginning, the diameters of sprockets are calculated in the following calculation formulas.
Subsequent, sprocket tooth profile (the form of your tooth based on its thickness) is calculated from your following calculation formulas. (The values shown while in the following pages have been calculated by these formulas and thought to be the normal values.)
Calculation formulas for diameters and tooth gap types Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The basic dimensions of a sprocket appropriate for any chain pitch of one mm are respectively called pitch diameter aspect, tip diameter aspect and caliper diameter aspect. The respective aspects for respective numbers of teeth are listed under. If these things are multiplied by chain pitch, the basic dimensions with the corresponding sprocket is usually obtained.
Illustration:
Within the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter aspect
Calculation formulas for tooth gap kinds
Since the most rational tooth gap varieties during which the pressure angle modifications in response on the elongation of a smoothly rotated roller chain using the lapse of services time, ANSI specify two varieties of tooth profiles: U-type and S-type. In general, S-type tooth profiles are adopted in accordance with ANSI, and our normal sprockets also have S-tooth profiles.
