Sprockets can be classified into common sprockets, HK sprockets and various sprockets.
1. Conventional sprocket
Conventional sprockets are ANSI sprockets which might be engaged with standard series roller chains. See P125 for dimensions.
There are two varieties of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets could be engaged with HK series roller chains, and these for single strand chains are identical to normal sprockets. Even so, sprockets for various strand chains are distinctive from normal 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 utilized to the following chains are the exact same because the typical sprockets in tooth gap type, but various in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of standard sprockets and other general sprockets are calculated as follows. At the outset, the diameters of 
sprockets are calculated through the following calculation formulas.
Upcoming, sprocket tooth profile (the form of the tooth determined by its thickness) is calculated from the following calculation formulas. (The values shown within the following pages were calculated by these formulas and regarded as the standard values.)
Calculation formulas for diameters and tooth gap kinds Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The fundamental dimensions of a sprocket suitable to get a chain pitch of 1 mm are respectively called pitch diameter aspect, tip diameter element and caliper diameter aspect. The respective elements for respective numbers of teeth are listed under. If these components are multiplied by chain pitch, the basic dimensions on the corresponding sprocket is usually obtained.
Example:
From the case of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter component
Calculation formulas for tooth gap types
As the most rational tooth gap forms in which the stress angle modifications in response on the elongation of a smoothly rotated roller chain with all the lapse of support time, ANSI specify two forms of tooth profiles: U-type and S-type. Usually, S-type tooth profiles are adopted in accordance with ANSI, and our conventional sprockets also have S-tooth profiles.
