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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