Type Dimension(mm) d s r a≈ d1 H PM31005A 10 4.5 0.5 2.4 4.2 14.5 PM31005AL PM31305A 13 5.5 0.5 3.4 5.2 19 PM31305AL PM31605A 16 7 0.5 4.4 6.2 23.5 PM31605AL PM31905A 19 8.5 0.5 5.4 7.2 28 PM31905AL