Sprockets is often classified into regular sprockets, HK sprockets and also other sprockets.
one. Common sprocket
Normal sprockets are ANSI sprockets which may be engaged with typical series roller chains. See P125 for dimensions.
You can find two types of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets is usually engaged with HK series roller chains, and those for single strand chains are identical to standard sprockets. Nevertheless, sprockets for a number of strand chains are diverse from conventional sprockets in sprocket tooth profile.
3. Other sprockets
Other sprockets are developed in accordance towards the following calculation formulas to suit respective specialty chains.
The sprockets made use of for the following chains will be the similar as the normal sprockets in tooth gap form, but distinctive in tooth thickness (sprocket tooth profile).
four. Calculation of sprocket dimensions
The dimensions of typical sprockets together with other standard sprockets are calculated as follows. In the beginning, the diameters of sprockets are calculated in the following calculation formulas.
Up coming, sprocket tooth profile (the shape on the tooth according to its thickness) is calculated from your following calculation formulas. 
(The values proven from the following pages had been calculated by these formulas and regarded as the typical values.)
Calculation formulas for diameters and tooth gap types Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The essential dimensions of the sprocket appropriate for a chain pitch of one mm are respectively identified as pitch diameter component, tip diameter factor and caliper diameter component. The respective components for respective numbers of teeth are listed beneath. If these elements are multiplied by chain pitch, the essential dimensions from the corresponding sprocket might be obtained.
Illustration:
Inside 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 during which the pressure angle improvements in response towards the elongation of the smoothly rotated roller chain using the lapse of services time, ANSI specify two kinds of tooth profiles: U-type and S-type. Normally, S-type tooth profiles are adopted in accordance with ANSI, and our common sprockets also have S-tooth profiles.
