... .3mm191.2mm38mmR1820182.3mm210.3mm38mmR2650264.9mm292.8mm38mmR3000298mm328mm42mmconstruction machinery: Construction machinery are used in construction machinery and mining machinery , the outer diameter is from ... seal group is applicable to various engineering machinery and mining machinery. Various loaders and land levelers, cranes, mixers, mining machines, etc. construction machinery for mining