Sprockets can be classified into regular sprockets, HK sprockets and also other sprockets.
1. Conventional sprocket
Standard sprockets are ANSI sprockets which could be engaged with conventional series roller chains. See P125 for dimensions.
You will find two varieties of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets is often engaged with HK series roller chains, and individuals for single strand chains are identical to typical sprockets. On the other hand, sprockets for many strand chains are diverse from normal sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are designed in accordance towards the following calculation formulas to suit respective specialty chains.
The sprockets utilised to the following chains will be the very same as the common sprockets in tooth gap form, but distinctive in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of common sprockets and other standard sprockets are calculated as follows. To start with, the diameters of sprockets are calculated through 
the following calculation formulas.
Next, sprocket tooth profile (the form with the tooth dependant upon its thickness) is calculated in the following calculation formulas. (The values proven within the following pages had been calculated by these formulas and thought to be the normal values.)
Calculation formulas for diameters and tooth gap kinds Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The fundamental dimensions of the sprocket suitable for any chain pitch of one mm are respectively named pitch diameter component, tip diameter component and caliper diameter aspect. The respective components for respective numbers of teeth are listed below. If these aspects are multiplied by chain pitch, the basic dimensions on the corresponding sprocket might be obtained.
Illustration:
Within the case of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter issue
Calculation formulas for tooth gap kinds
As the most rational tooth gap types through which the pressure angle adjustments in response for the elongation of a smoothly rotated roller chain together with the lapse of service time, ANSI specify two types of tooth profiles: U-type and S-type. In general, S-type tooth profiles are adopted in accordance with ANSI, and our standard sprockets also have S-tooth profiles.