Sprockets might be classified into standard sprockets, HK sprockets together with other sprockets.
1. Typical sprocket
Conventional sprockets are ANSI sprockets which may be engaged with conventional series roller chains. See P125 for dimensions.
There are two styles of tooth profiles: U-tooth and S-tooth.
2. HK sprocket
HK sprockets may be engaged with HK series roller chains, and individuals for single strand chains are identical to standard sprockets. Even so, sprockets for several strand chains are 
distinct from common sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are developed in accordance towards the following calculation formulas to suit respective specialty chains.
The sprockets utilised for that following chains will be the identical because the standard sprockets in tooth gap type, but diverse in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of common sprockets as well as other common sprockets are calculated as follows. Initially, the diameters of sprockets are calculated in the following calculation formulas.
Up coming, sprocket tooth profile (the form of the tooth depending on its thickness) is calculated from your following calculation formulas. (The values proven during the following pages were calculated by these formulas and regarded as the normal values.)
Calculation formulas for diameters and tooth gap forms Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The essential dimensions of a sprocket ideal to get a chain pitch of 1 mm are respectively known as pitch diameter issue, tip diameter factor and caliper diameter aspect. The respective variables for respective numbers of teeth are listed beneath. If these factors are multiplied by chain pitch, the fundamental dimensions of your corresponding sprocket is usually obtained.
Instance:
While in the situation of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter issue
Calculation formulas for tooth gap types
Since the most rational tooth gap forms during which the pressure angle modifications in response towards the elongation of the smoothly rotated roller chain using the lapse of support time, ANSI specify two varieties 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.