Technical Section
Tolerances Used for Standard Metric and Inch Size Bores
Metric Size Bores
Hole Diameter in Millimeters H 7 H 8 H 9 H 11 H 13
1 3 +0.010
0
+0.014
0
+0.025
0
+0.060
–0
+0.140
0
4 6 +0.012
0
+0.018
0
+0.030
0
+0.075
–0
+0.180
0
7 10 +0.015
0
+0.022
0
+0.036
0
+0.090
–0
+0.220
0
11 18 +0.018
0
+0.027
0
+0.043
0
+0.110
–0
+0.270
0
19 30 +0.021
0
+0.033
0
+0.052
0
+0.130
–0
+0.330
0
31 50 +0.025
0
+0.039
0
+0.062
0
+0.160
–0
+0.380
0

millimeters is
Example:

+0.018
0
Tolerance for Hole Diameter 11-18

x .0394 = +0.00071
0

inches
Inch Size Bores
Bore Size Tolerance
.250 1.00 inches + .001 inches
0
over 1.00 inches + .002 inches
0
To Tolerances Used for Standard Metric and Inch Size Keyways and Square Holes

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