Bearing No	Inside Diameter b		Outside Diameter D		Width B				Flange Dimensions		Radius r min	Basic Load Rating		Ball Complement
					Open		Shielded& Sealed		Open			Dynamic Cr	Static Cor	Number	Size
									Df	Wf
	mm	in	mm	in	mm	in	mm	in	mm	in	in	1b	1b		mm
R144 R2-5 R2-6 R2 R2A R155	3.175 3.175 3.175 3.175 3.175 3.969	.1250 .1250 .1250 .1250 .1250 .1562	6.350 7.938 9.525 9.525 12.700 7.938	.2500 .3125 .3750 .3750 .5000 .3125	2.38 2.78 2.78 3.97 4.37 2.78	.0973 .1094 .1094 .1562 .1719 .1094	2.78 3.57 3.57 3.97 4.37 3.18	.1094 .1406 .1406 .1562 .1719 .1094	.296 .359 .422 .440 … .359	.023 .023 .023 .030 … .023	.004 .004 .006 .012 .012 .004	35 64 73 73 73 42	13 24 29 29 29 18	… … … 7 6 …	… … … 1.588 2.381 …
R156 R166 R3 R3A R168 R188	4.763 4.763 4.763 4.763 6.350 6.350	.1875 .1875 .1875 .1875 .2500 .2500	7.938 9.525 12.700 12.700 9.525 12.700	.3125 .3750 .5000 .5000 .3750 .5000	2.78 3.18 3.97 4.98 3.18 3.18	.1094 .1250 .1562 .1960 .1250 .1250	3.18 3.18 4.98 4.98 3.18 3.18	.1094 .1250 .1960 .1960 .1250 .1875	.359 .422 .565 … 422 547	.023 .023 .042 … .023 .023	.004 .004 .012 .012 .004 .006	42 81 147 147 42 123	18 33 64 64 20 55	… … 6 … … 8	… … 2.381 … … 1.588
R4 R4A R6 R8 R8-7	6.350 6.350 9.525 12.700 11.113	.2500 .2500 .3750 .5000 .4375	15.875 19.050 22.225 28.575 28.575	.6250 .7500 .8750 1.125 1.125	4.98 5.56 5.56 6.35 6.35	.1960 .2188 .2188 .2500 .2500	4.98 5.56 5.56 6.35 6.35	.1960 .2812 .2812 .2500 .2500	.690 … .969 .255 …	.042 … .062 .062 …	.012 .016 .016 .016 .016	167 403 575 880 880	77 198 304 505 505	8 6 7 8 8	2.381 3.969 3.969 4.763 4.763