Basic bearing Bore d(mm)　 Outer Diameter(mm)　 Width(mm) RADIUS(mm) BasicloadRatingKN BallComplement openmm inch shieldedsealedmm inch DynamicCr StaticCOr no　 size(mm) R156 4.763 .1875 7.938 .3125 2.78 .1094 3.18 .1250 0.1 .004 0.187 0.080 R166 4.763 .1875 9.525 .3750 3.18 .1250 3.18 .1250 0.1 .004 0.360 0.147 8 1.588 R3 4.763 .1875 12.700 .5000 3.97 .1562 4.98 .1960 0.3 .012 0.653 0.284 6 2.381 R3A 4.763 .1875 12.700 .5000 4.98 .1960 4.98 .1960 0.3 .012 0.653 0.284 R168 6.350 .2500 9.525 .3750 3.18 .1250 3.18 .1250 0.1 .004 0.187 0.089 R188 6.350 .2500 12.700 .5000 3.18 .1250 3.18 .1250 0.15 .006 0.547 0.244 8 1.588 R4 6.350 .2500 15.875 .6250 4.98 .1960 4.98 0.1960 0.3 .012 0.742 0.342 8 2.381 R4A 6.350 .2500 19.050 .7500 5.56 .2188 7.14 .2812 0.4 .016 1.791 0.88 6 3.969 R6 9.525 .3750 22.225 .8750 5.56 .2188 7.14 .2812 0.4 .016 2.556 1.351 7 3.969 R8 12.700.5000 28.575 1.1250 6.35 .2500 7.14 .2812 0.4 .016 3.912 2.245 8 4.763 R8-7 11.113 .4375 28.575 1.1250 6.35 .2500 0.4 .016 3.912 2.245 8 4.763 R10 15.875 .6250 34.925 1.3750 7.14 .2812 8.73 .3438 0.8 .031 4.605 2.774 9 4.763 R12 19.050 .7500 41.275 1.6250 7.94 .3125 11.11 .4375 0.8 .031 7.246 4.445 9 6.35 99502H 15.875 .6250 34.925 1.3750 11 .4331 0.8 .031 4.605 2.774 8 5.593 SC0563 25 .9843 62 2.4409 12 .4704 1.0 .039 12.81 8.44 9 8.731 63/28 28 1.1024 68 2.6772 18 .7087 11.1 .043 34.0 20.0 8 11.5 MS12 31.75 1.25 79.247 3.1239 22.225 .874 1.1 .043 25.5 17.58 7 14.2875