Bearing Bore Diameter D outer Diameter D flange Diameter Df radius R(min) open bearing shielded bearing Width B flange width Bf open double shielded width B1 flange width Bf1 Inch/mm inch/mm inch/mm inch/mm inch/mm inch/mm bearing number inch/mm inch/mm 0.1250/3.1750 0.2500/6.3500 0.2960/7.5180 0.003/0.08 0.0937/2.3800 0.0230/0.5840 fr144 fr144zz 0.1094/2.7788 0.0310/0.7870 0.3125/7.9375 0.3590/9.1190 0.003/0.08 0.1094/2.7788 0.0230/0.5840 fr2-5 fr2-5zz 0.1406/3.5712 0.0310/0.7870 0.3750/9.5250 0.4220/10.7190 0.005/0.13 0.1094/2.7788 0.0230/0.5840 fr2-6 fr2-6zz 0.1406/3.5712 0.0310/0.7870 0.3750/9.5250 0.4400/11.1760 0.012/0.30 0.1562/3.9675 0.0300/0.7620 fr2 fr2zz 0.1562/3.9675 0.0300/0.7620 0.1875/4.7625 0.3125/7.9375 0.3590/9.1190 0.003/0.08 0.1094/2.7788 0.0230/0.5840 fr156 fr156zz 0.1250/3.1750 0.0360/0.9140 0.3750/9.5250 0.4220/10.7190 0.003/0.08 0.1250/3.1750 0.0230/0.5840 fr166 fr166zz 0.1250/3.1750 0.0310/0.7870 0.5000/12.7000 0.5650/14.3510 0.012/0.03 0.1562/3.9675 0.0420/1.0670 fr3 fr3zz 0.1960/4.9784 0.0420/1.0670 0.2500/6.3500 0.3750/9.5250 0.4220/10.7190 0.003/0.08 0.1250/3.1750 0.0230/0.5840 fr168 fr168zz 0.1250/3.1750 0.0360/0.9140 0.5000/12.7000 0.5470/13.8940 0.005/0.13 0.1250/3.1750 0.0230/0.5840 fr188 fr188zz 0.1875/4.7625 0.0450/1.1430 0.6250/15.8750 0.6900/17.5260 0.012/0.30 0.1960/4.9784 0.0420/1.0670 fr4 fr4zz 0.1960/4.9784 0.0420/1.0610 0.3125/7.9375 0.5000/12.7000 0.5470/13.8940 0.005/0.13 0.1562/3.9675 0.0310/0.7870 fr1810 fr1810zz 0.1562/3.9625 0.0310/0.7870 0.3750/9.5250 0.8750/22.2250 0.9690/24.6150 0.160/0.40 0.2188/5.5375 0.062/1.5750 fr6 fr6zz 0.2812/7.1425 0.0620/1.5750