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Need the dimensional data for a standard 20 or 25 degree spur gear? Here's a great tool to calculate the numbers you need for your drawing


for Standard Pressure Angles of 20 and 25 Degrees

(for American National Standard Coarse Pitch Spur Gear Tooth Forms)
ref: ASME B6.1

How to use this tool
D = Pitch Diameter (in)
N = Number of Teeth (-)
THETA =  20   25   Pressure Angle (deg)

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