Sprockets might be classified into common sprockets, HK sprockets and also other sprockets.
1. Common sprocket
Regular sprockets are ANSI sprockets which can be engaged with regular series roller chains. See P125 for dimensions.
There are actually 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 common sprockets. Nonetheless, sprockets for various strand chains are distinct from standard sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are made according to your following calculation formulas to suit respective specialty chains.
The sprockets utilised for your following chains will be the similar because the common sprockets in tooth gap form, but different in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of standard sprockets as well as other basic sprockets are calculated as follows. At first, the diameters of sprockets are calculated from your following calculation formulas.
Subsequent, sprocket tooth profile (the shape with the tooth dependant upon its thickness) is calculated from your following calculation formulas. (The values shown from the following pages have been 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 a sprocket suitable to get a chain pitch of one mm are respectively called pitch diameter factor, tip diameter aspect and caliper diameter element. The respective aspects for respective numbers of teeth are listed under. If these elements are multiplied by chain pitch, the fundamental dimensions of your corresponding sprocket could be obtained.
Example:
In the situation of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter component
Calculation formulas for tooth gap varieties
Since the most rational tooth gap kinds by which the stress angle changes in response for the elongation of a smoothly rotated roller chain with all the lapse of support time, ANSI specify two 
sorts of tooth profiles: U-type and S-type. On the whole, S-type tooth profiles are adopted in accordance with ANSI, and our regular sprockets also have S-tooth profiles.
