Sprockets may be classified into typical sprockets, HK sprockets and various sprockets.
1. Standard sprocket
Typical sprockets are ANSI sprockets which can be engaged with common series roller chains. See P125 for dimensions.
You can find two types 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 normal sprockets. Having said that, sprockets for several strand chains are unique from regular sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are designed in accordance towards the following calculation formulas to suit respective specialty chains.
The sprockets made use of for your following chains are the exact same because the regular sprockets in tooth gap type, but distinctive in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of regular sprockets as well as other common sprockets are calculated as follows. At the 
outset, the diameters of sprockets are calculated through the following calculation formulas.
Up coming, sprocket tooth profile (the shape of the tooth based on its thickness) is calculated from your following calculation formulas. (The values proven while in the following pages were calculated by these formulas and regarded as the standard values.)
Calculation formulas for diameters and tooth gap forms Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The basic dimensions of the sprocket ideal for a chain pitch of 1 mm are respectively termed pitch diameter component, tip diameter aspect and caliper diameter factor. The respective factors for respective numbers of teeth are listed under. If these aspects are multiplied by chain pitch, the essential dimensions on the corresponding sprocket could be obtained.
Example:
During the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter component
Calculation formulas for tooth gap forms
Because the most rational tooth gap forms in which the strain angle improvements in response towards the elongation of the smoothly rotated roller chain together with the lapse of service time, ANSI specify two forms of tooth profiles: U-type and S-type. Generally, S-type tooth profiles are adopted in accordance with ANSI, and our typical sprockets also have S-tooth profiles.