Sprockets might be classified into regular sprockets, HK sprockets along with other sprockets.
one. Normal sprocket
Common sprockets are ANSI sprockets which could be engaged with regular series roller chains. See P125 for dimensions.
You’ll find two varieties of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets can be engaged with HK series roller chains, and people for single strand chains are identical to common sprockets. Even so, sprockets for numerous strand chains are various from typical sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are made according to the following calculation formulas to suit respective 
specialty chains.
The sprockets utilized for the following chains are the similar as the regular sprockets in tooth gap type, but different in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of normal sprockets and other general sprockets are calculated as follows. At first, the diameters of sprockets are calculated from your following calculation formulas.
Next, sprocket tooth profile (the form on the tooth based on 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 common 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 to get a chain pitch of one mm are respectively termed pitch diameter element, tip diameter component and caliper diameter element. The respective things for respective numbers of teeth are listed below. If these aspects are multiplied by chain pitch, the basic dimensions from the corresponding sprocket can be obtained.
Instance:
Inside the situation of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter issue
Calculation formulas for tooth gap varieties
Since the most rational tooth gap varieties by which the pressure angle alterations in response on the elongation of the smoothly rotated roller chain using the lapse of service time, ANSI specify two varieties of tooth profiles: U-type and S-type. Usually, S-type tooth profiles are adopted in accordance with ANSI, and our common sprockets also have S-tooth profiles.
