61820 Size:100x125x13mm Weight:0.31kg Z: Pressed steel shield at one side of the bearing 2Z: Z shield at both sides of the bearing RS1: Synthetic rubber seal with sheet steel reinforcement.Rubbing seal at one side of bearing 2RS1: RS1 seal at one side of the bearing RZ: Single low friction seal on the side of the rubber sheet 2RZ: Double low friction seal on the side of the rubber sheet N: Annular groove in outside dia-meter of outer ring NR: Annular groove in outside dia-meter of outer ring and appropriate snap ring 1.single row deep groove ball bearings 2.single row deep groove ball bearings with dust cover 3.with a dust cover, a ring of single row deep groove ball bearings 4.the outer ring on the stopper groove and snap ring of single row deep groove ball bearings 5.deep groove ball bearings ball gap 6.double row deep groove ball bearings 1)6000series: 604.605.606.607.608.609.6000.6001.6002.6003.6004.6005.6006.6007.6008.6009. 6010.6011.6012 2) 6200 series: 624.625.626.627.628.629.6200.6201.6202.6203.6204.6205.6206.6207.6208.6209. 6210.6211.6212 3) 6300 series: 634.635.636.637.638.639.6300.6301.6302.6303.6304.6305.6306.6307.6308.6309. 6310.6311.6312 4) 6400 series: 6403.6404.6405.6406.6407.6408.6409.6410.6411.6412.6413.6414.6415.6416. 6417.6418.6419.6420 5) 6700 series: 673.674.675.676.677.678.679.6700.6701.6702.6703.6704.6705 6) 6800 series: 685.686.687.688.689.6800.6801.6802.6803.6804.6805.6806.6807.6808.6809. 6810.6811.6812 7) 6900 series: 695.696.697.698.699.6900.6901.6902.6903.6904.6905.6906.6907.6908.6909. 6910.6911.6912 8)16000 series: 16001.16002.16003.16004.16005.16006.16007.16008.16009.16010.16011.16012. 16013.16014.16015