Sprockets is usually classified into conventional sprockets, HK sprockets as well as other sprockets.
one. Typical sprocket
Conventional sprockets are ANSI sprockets which can be engaged with conventional series roller chains. See P125 for dimensions.
You can find two styles of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets might be engaged with HK series roller chains, and people for single strand chains are identical to conventional sprockets. Even so, sprockets for numerous strand chains are distinct from normal sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are made according to the 
following calculation formulas to suit respective specialty chains.
The sprockets utilized for that following chains are the same because the normal sprockets in tooth gap type, but various in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of standard sprockets and various basic sprockets are calculated as follows. Initially, the diameters of sprockets are calculated in the following calculation formulas.
Following, sprocket tooth profile (the shape in the tooth dependant upon its thickness) is calculated through the following calculation formulas. (The values shown while in the following pages were calculated by these formulas and thought to be the common values.)
Calculation formulas for diameters and tooth gap varieties Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The essential dimensions of a sprocket suitable to get a chain pitch of 1 mm are respectively known as pitch diameter issue, tip diameter aspect and caliper diameter element. The respective aspects for respective numbers of teeth are listed under. If these variables are multiplied by chain pitch, the basic dimensions on the corresponding sprocket is usually obtained.
Illustration:
From the situation of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter element
Calculation formulas for tooth gap forms
Since the most rational tooth gap varieties by which the pressure angle improvements in response to your elongation of the smoothly rotated roller chain together with the lapse of service time, ANSI specify two types 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.
