Sprockets might be classified into common sprockets, HK sprockets and other sprockets.
one. Standard sprocket
Typical sprockets are ANSI sprockets which could be engaged with normal series roller chains. See P125 for dimensions.
There are actually two types of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets may be engaged with HK series roller chains, and these for single strand chains are identical to typical sprockets. However, sprockets for a number of strand chains are distinct from normal sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are built according on the following calculation formulas to suit respective specialty chains.
The sprockets employed to the following chains are the similar because the common sprockets in tooth gap form, but diverse in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of typical sprockets and also other general sprockets are calculated as follows. Initially, the diameters of sprockets are calculated in the following calculation formulas.
Subsequent, sprocket tooth profile (the shape of your tooth depending on its thickness) is calculated from the following calculation formulas. (The values proven during the following pages have been calculated by these formulas and regarded as 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 the sprocket suitable for any chain pitch of one mm are respectively known 
as pitch diameter aspect, tip diameter issue and caliper diameter aspect. The respective elements for respective numbers of teeth are listed beneath. If these variables are multiplied by chain pitch, the basic dimensions in the corresponding sprocket is usually obtained.
Illustration:
Inside the situation of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter aspect
Calculation formulas for tooth gap varieties
Because the most rational tooth gap varieties in which the strain angle changes in response towards the elongation of a smoothly rotated roller chain with all the lapse of service time, ANSI specify two forms of tooth profiles: U-type and S-type. Normally, S-type tooth profiles are adopted in accordance with ANSI, and our common sprockets also have S-tooth profiles.
