... common shaft sizes:12mm, 16mm,20mm, 5/8'' or3/4'' 2, for high temperature rubber 3, ISO9001 WenZhou RiMi Seal Manufacture Co ... common shaft sizes: 12mm, 13mm, 15mm, 16mm ,17mm, 20mm, 1/2'', 5/8'', 3/4''3, sturdy coil spring4, sintered steel ... low pressure, small diameter rotary shaft applications. Auto unitized seal for engine coolant pumps type 6A