Sprockets is often classified into standard sprockets, HK sprockets along with other sprockets.
one. Common sprocket
Typical sprockets are ANSI sprockets which can be engaged with standard series roller chains. See P125 for dimensions.
You will discover two forms of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets could be engaged with HK series roller chains, and people for single strand chains are identical to standard sprockets. On the other hand, sprockets for several strand chains are distinct from normal sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are created according towards the following calculation formulas to suit respective specialty chains.
The sprockets employed to the following chains are the exact same because 
the regular sprockets in tooth gap type, but various in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of regular sprockets and various standard sprockets are calculated as follows. In the beginning, the diameters of sprockets are calculated from the following calculation formulas.
Following, sprocket tooth profile (the shape from the tooth dependant upon its thickness) is calculated from your following calculation formulas. (The values shown inside the following pages were calculated by these formulas and regarded as the typical values.)
Calculation formulas for diameters and tooth gap varieties Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The basic dimensions of the sprocket suitable to get a chain pitch of 1 mm are respectively referred to as pitch diameter issue, tip diameter element and caliper diameter aspect. The respective elements for respective numbers of teeth are listed beneath. If these variables are multiplied by chain pitch, the essential dimensions with the corresponding sprocket is usually obtained.
Illustration:
During the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter element
Calculation formulas for tooth gap varieties
Since the most rational tooth gap forms during which the pressure angle alterations in response to the elongation of the smoothly rotated roller chain together with the lapse of service time, ANSI specify two kinds of tooth profiles: U-type and S-type. In general, S-type tooth profiles are adopted in accordance with ANSI, and our typical sprockets also have S-tooth profiles.