Type Dimension(mm) d s r a≈ d1 H PM41002H 10 3.5 0.2 2.4 4.2 10 PM41305H 13 4.5 0.5 3.4 5.2 13 PM41605H 16 5.5 0.5 4.4 6.2 16 PM41610H 16 5.5 1 4.4 6.2 16 PM41910H 19 6.5 1 5.4 7.2 19 PM42510H 25 9 1 10 9 25