Sprockets might be classified into common sprockets, HK sprockets together with other sprockets.
1. Normal sprocket
Typical sprockets are ANSI sprockets which might be engaged with typical series roller chains. See P125 for dimensions.
You will find two types of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets is often engaged with HK series roller chains, and these for single strand chains are identical to typical sprockets. On the other hand, sprockets for various strand chains are unique from normal sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are made in accordance on the following calculation formulas to suit respective specialty chains.
The sprockets used for the following chains 
are the similar as the standard sprockets in tooth gap type, but diverse in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of normal sprockets and various general 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 according to its thickness) is calculated in the following calculation formulas. (The values proven while in the following pages had been calculated by these formulas and thought to be the standard 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 suitable to get a chain pitch of one mm are respectively named pitch diameter component, tip diameter aspect and caliper diameter component. The respective aspects for respective numbers of teeth are listed beneath. If these aspects are multiplied by chain pitch, the essential dimensions in the corresponding sprocket is usually obtained.
Instance:
From the situation of 80 (25.forty mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter factor
Calculation formulas for tooth gap types
Since the most rational tooth gap varieties through which the pressure angle adjustments in response towards the elongation of the smoothly rotated roller chain together with the lapse of services time, ANSI specify two forms of tooth profiles: U-type and S-type. In general, S-type tooth profiles are adopted in accordance with ANSI, and our regular sprockets also have S-tooth profiles.