BL Precision Bearings: Radial Ball Bearings ... - Maryland Metrics
BL Precision Bearings: Radial Ball Bearings ... - Maryland Metrics
BL Precision Bearings: Radial Ball Bearings ... - Maryland Metrics
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APPENDIXAPPENDIXRADIAL INTERNAL CLEARANCE FOR BALL BEARING UNITS<strong>Radial</strong> internal clearance provides for thermal expansion andslight misalignment of the inner and outer rings. Internal clearancesfor ball bearing units are typically greater than those ofthe same size of radial ball bearings. Proper internal clearanceis important for optimal bearing life. Below are the most commonclearance classifications for cylindrical bore insert bearings.RADIAL INTERNAL CLEARANCE FOR CYLINDRICAL BORE BEARINGSBore diameter CO C3 C4Over To min. max. min. max. min. max.mm in mm in .001mm .0001in .001mm .0001in .001mm .0001in .001mm .0001in .001mm .0001in .001mm .0001in10 .39 18 .71 3 1 18 7 10 4 25 10 18 7 33 1318 .71 24 .95 5 2 20 8 12 5 28 11 20 8 36 1424 .95 30 1.18 5 2 20 8 12 5 28 11 23 9 41 1630 1.18 40 1.58 6 2 20 8 13 6 33 13 28 11 46 1840 1.50 50 1.97 6 2 23 9 14 6 36 14 30 12 51 2050 1.97 65 2.56 8 3 28 11 18 7 43 17 38 15 61 2465 2.56 80 3.15 10 4 30 12 20 8 51 20 46 18 71 2880 3.15 100 3.94 12 5 36 14 24 10 58 23 53 21 84 33100 3.94 120 4.72 15 6 41 16 28 12 66 26 61 24 97 38120 4.72 140 5.51 18 7 48 19 33 13 81 32 71 28 114 45TOLERANCES<strong>BL</strong> bearings conform to ABEC 1 tolerances and provide precise fitups and service.INNER RING BORE DIAMETEROUTER RING ODMMINCHESOver To Tolerance Over To Tolerance2.5 18 +000 - .008 .0984 .7087 +000 - .000318 30 +000 - .010 .7087 1.181 +000 - .000430 50 +000 - .012 1.181 1.968 +000 - .0004550 80 +000 - .015 1.968 3.150 +000 - .000680 120 +000 - .020 3.150 4.724 +000 - .0008MMINCHESOver To Tolerance Over To Tolerance6 18 +000 - .008 .236 .709 +000 - .000318 30 +000 - .009 .709 1.181 +000 - .0003530 50 +000 - .011 1.181 1.968 +000 - .0004550 80 +000 - .013 1.968 3.150 +000 - .000580 120 +000 - .015 3.150 4.724 +000 - .0006120 150 +000 - .018 4.724 5.905 +000 - .0007RING WIDTH TOLERANCESMMINCHESOver To Tolerance Over To Tolerance2.5 50 +000 - .12 .1 2.0 +000 - .004750 80 +000 - .15 2.0 3.1 +000 - .005980 120 +000 - .20 3.1 4.7 +000 - .007965
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