Type Dimension(mm) d s r a≈ d1 H PM41305D 13 4.5 0.5 4.4 5.2 13 PM41305DL PM41610D 16 5.5 1 5.5 6.2 16 PM41610DL PM41910D 19 7 1 6.8 7.2 19 PM41910DL