Machinery's Handbook, 31st Edition
Plain Bearing Materials 2443 Table 5b. Copper- and Iron-Base Sintered Bearings (Oil Impregnated) ASTM B438-17, ASTM B439-18, and Appendices Commercial Dimensional Tolerances a , b Diameter Tolerance Length Tolerance Diameter Tolerance Length Tolerance Copper Base Iron Base Inside or Outside Diameter Total Diameter Tolerances Length Total Length Tolerances Inside or Outside Diameter Total Diameter Tolerances Length Total Length Tolerances Up to 1 0.001 Up to 1.5 0.01 Up to 0.760 − 0.001 Up to 1.495 0.01 1 to 1.5 0.0015 1.5 to 3 0.01 0.761-1.510 − 0.0015 1.496-1.990 0.02 1.5 to 2 0.002 3 to 4.5 0.02 1.511-2.510 − 0.002 1.991-2.990 0.02 2 to 2.5 0.0025 … … 2.511-3.010 − 0.003 2.991-4.985 0.03 2.5 to 3 0.003 … … 3.011-4.010 − 0.005 … … … … … … 4.011-5.010 − 0.005 … … … … … … 5.011-6.010 − 0.006 … … Concentricity Tolerance a,b,c Iron Base Copper Base Outside Diameter Max. Wall Thickness Concentricity Tolerance Outside Diameter Length Concentricity Tolerance
0 to 1 1 to 2 2 to 3 0 to 1 1 to 2 2 to 3 0 to 1 1 to 2
0.000 0.004 0.005 0.004 0.005 0.006 0.005 0.006
Up to 1.510 Up to 0.355
0.003
Up to 1
1.511 to 2.010 Up to 0.505
0.004
1 to 2
2.011 to 4.010 Up to 1.010
0.005
4.011 to 5.010 Up to 1.510
0.006
2 to 3
5.011 to 6.010 Up to 2.010 0.007 a For copper-base bearings with 4-to-1 maximum-length-diameter ratio and a 24-to-1 maximum- length-to-wall-thickness ratio; bearings with greater ratios are not covered here. 0.007 2 to 3 b For iron-base bearings with a 3-to-1 maximum-length-to-inside diameter ratio and a 20-to-1 maximum-length-to-wall-thickness ratio; bearings with greater ratios are not covered here. c Total indicator reading. Table 5c. Copper- and Iron-Base Sintered Bearings (Oil Impregnated) ASTM B438-17, ASTM B439-18, and Appendices
Flange and Thrust Bearings, Diameter, and Thickness Tolerances
a on Faces, max.
Parallellism
Flange Diameter Tolerance
Flange Thickness Tolerance
Copper Base
Iron Base
Diameter Range
Standard Special
Standard Special
Standard Special
Standard Special
0.002 0.003 0.004
0.005 0.007 0.010
0.003 0.005
0 to 1 1 ⁄ 2
± 0.005 ± 0.010 ± 0.025
± 0.0025 ± 0.005 ± 0.010
± 0.005 ± 0.010 ± 0.015
± 0.0025 0.003
0.004 0.005
Over 1 1 ⁄ 2 to 3
± 0.007 ± 0.010
Over 3 to 6 0.007 a Standard and special tolerances are specified for diameters, thicknesses, and parallelism. Spe - cial tolerances should not be specified unless required because they require additional or second - ary operations and, therefore, are costlier. Thrust bearings (¼ inch thickness, max.) have a stan- dard thickness tolerance of ±0.005 inch and a special thickness tolerance of ±0.0025 inch for all diameters. All dimensions in inches except where otherwise noted.
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