Lead is twice the pitch

Lead is half the pitch

Lead is equal to pitch

Lead is 1/4 pitch

0.025"

0.038"

0.049"

0.082"

Driver 45 teeth, Driven 60 teeth

Driver 60 teeth, Driven 50 teeth

Driver 30 teeth, Driven 70 teeth

Driver 50 teeth, Driven 100 teeth

For easy alignment

For quick transmission

For easy engagement

For general fastening

21 mm

21.5 mm

22.5 mm

24 mm