Sprockets can be classified into typical sprockets, HK sprockets along with other sprockets.
one. Typical sprocket
Regular sprockets are ANSI sprockets which could be engaged with regular 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 can be engaged with HK series roller 
chains, and these for single strand chains are identical to regular sprockets. Even so, sprockets for several strand chains are distinctive from regular sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are made in accordance to your following calculation formulas to suit respective specialty chains.
The sprockets used for your following chains will be the identical since the regular sprockets in tooth gap form, but unique in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of normal sprockets together with other standard sprockets are calculated as follows. At first, the diameters of sprockets are calculated through the following calculation formulas.
Up coming, sprocket tooth profile (the form on the tooth dependant upon its thickness) is calculated from your following calculation formulas. (The values shown within the following pages had been calculated by these formulas and thought to be the regular values.)
Calculation formulas for diameters and tooth gap forms Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The fundamental dimensions of the sprocket appropriate to get a chain pitch of one mm are respectively known as pitch diameter factor, tip diameter issue and caliper diameter element. The respective aspects for respective numbers of teeth are listed under. If these aspects are multiplied by chain pitch, the fundamental dimensions with the corresponding sprocket is often obtained.
Instance:
While in the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter issue
Calculation formulas for tooth gap varieties
As the most rational tooth gap kinds through which the stress angle changes in response towards the elongation of the smoothly rotated roller chain using the lapse of services 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.