Technical Section
Tolerances Used for Standard Metric and Inch Size Bores
Metric Size Bores
Hole Diameter in Millimeters H 7H 8H 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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