Sprockets is usually classified into standard sprockets, HK sprockets and various sprockets.
1. Normal sprocket
Normal sprockets are ANSI sprockets which may be engaged with normal series roller chains. See P125 for dimensions.
There are two types of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets is often engaged with HK series roller chains, and these for single strand chains are identical to conventional sprockets. Nevertheless, sprockets for several strand chains are distinct from regular sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are developed in accordance for the following calculation formulas to suit respective specialty chains.
The sprockets employed for your following chains would be the identical as the common sprockets in tooth gap kind, but distinct in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of regular sprockets and various common sprockets are calculated as follows. At the outset, the diameters of sprockets are calculated from the following 
calculation formulas.
Subsequent, sprocket tooth profile (the shape in the tooth depending on its thickness) is calculated from the following calculation formulas. (The values proven inside the following pages had been calculated by these formulas and regarded as the common values.)
Calculation formulas for diameters and tooth gap kinds Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The basic dimensions of a sprocket ideal for a chain pitch of one mm are respectively known as pitch diameter aspect, tip diameter element and caliper diameter component. The respective things for respective numbers of teeth are listed below. If these elements are multiplied by chain pitch, the basic dimensions with the corresponding sprocket can be obtained.
Instance:
During the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter component
Calculation formulas for tooth gap kinds
Since the most rational tooth gap kinds during which the strain angle adjustments in response towards the elongation of a smoothly rotated roller chain with the lapse of service time, ANSI specify two kinds of tooth profiles: U-type and S-type. On the whole, S-type tooth profiles are adopted in accordance with ANSI, and our typical sprockets also have S-tooth profiles.
