>> P.510
■Features■Identification NumberIKO Seals for Needle Roller Bearings have a low The identication number of Seals for Needle Roller sectional height and consist of a sheet metal ring and Bearings consists of a model code and dimensions. special synthetic rubber. An example of an identication number is shown as As these seals are manufactured to the same sec-follows.tional height as IKO Needle Roller Bearings, grease leakage and the penetration of foreign particles can be effectively prevented by tting them directly to the sides of combinable bearings shown in the dimension table. When tting seals to needle roller bearings with inner ring, wide inner rings (see page H2) must be used, as shown in the mounting examples. ■TypesSeals for Needle Roller Bearings are available as shown in Table1.Table 1 Seal typeType Single lipDouble lipsExample of identication numberModel codeDimensionsDS20284Type of sealShaft dia.(20mm)Outside dia. of seal(28mm)Width of seal(4mm)Metal ringMetal ring■AccuracyStructureLipSecondary lipMain lipTolerances of Seals for Needle Roller Bearings are Model codeOSDSL1based on JIS B 2402-1.Tolerances of outside diameter and width are based on Tables 2 and 3, respectively.Table 2 Tolerance of outside diameterunit: mmNominal outside diameterToleranceOver-305080Incl.305080120High+0.09+0.11+0.14+0.17Low+0.04+0.05+0.06+0.08Table 3 Tolerance of widthunit: mmNominal size of widthToleranceOver-6Incl.610High+0.2+0.3Low-0.2-0.3
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