Tolerances for plain bearings, selection the tolerances, fits and clearance of plain bearing bushings is very important to avoid overheat of bearing and prolong the life of bearing.

What are the recommended requirements for mounting seat holes and shafts for Plain bearings?

Plain Bearings Tolerance

Bearing tolerance

Answer: the recommended bearing bore is H7 tolerance, the shaft diameter is h6 ~ h9; The universal ideal shaft material is hard chrome plated on the surface, and the ideal surface finish is Ra0.4 ~ 0.8.

 

Standard Dia.O.D.SizeHousing BoreI.D.SizeMatching Shaft Diameter
10~18+0.065
+0.030
+0.018
0
+0.046
0
– 0.016
– 0.043
18~30+0.075
+0.035
+0.021
0
+0.052
0
– 0.020
– 0.020
30~50+0.085
+0.045
+0.025
0
+0.062
0
– 0.025
– 0.064
50~80+0.100
+0.055
+0.030
0
+0.074
0
– 0.030
– 0.076
80~120+0.120
+0.070
+0.035
0
+0.087
0
– 0.036
– 0.090
120~180+0.170
+0.100
+0.400
0
+0.100
0
– 0.043
– 0.106
180~250+0.210
+0.130
+0.046
0
+0.115
0
– 0.050
– 0.122
250~315+0.260
+0.170
+0.052
0
+0.130
0
– 0.056
– 0.137