stubb teeth are a standard tooth form and have shorter addendums and dedendums
than the full depth gear teeth.If you have enough contact ratio, stub teeth may be specified. They are stonger but you do lose contact ratio.There are two standard stub forms.The American Standard Stub and also the Fellows Stub which has two numbers representing them. The first number is the actual diametral pitch and the second number determines the addendum and dedendum ratios.Remember minimum number of teeth on full depth gear is 18 whereas for stub involute is 14.
