ISO Tolerances for Round, Hexagon & Square Bar
(h Tolerances are minus; k Tolerances are plus) - all dimensions in mm
| Diameter/Across Flats/Square | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 16 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 to 3mm | .004 | .006 | .010 | .014 | .025 | .040 | .060 | .090 | .140 | |
| >3 to 6mm | .005 | .008 | .012 | .018 | .030 | .048 | .075 | .120 | .180 | .750 |
| >6 to 10mm | .006 | .009 | .015 | .022 | .036 | .058 | .090 | .150 | .220 | .900 |
| >10 to 18mm | .008 | .011 | .018 | .027 | .043 | .070 | .110 | .180 | .270 | 1.100 |
| >18 to 30mm | .009 | .013 | .021 | .033 | .052 | .084 | .130 | .210 | .330 | 1.300 |
| >30 to 50mm | .011 | .016 | .025 | .039 | .062 | .100 | .160 | .250 | .390 | 1.600 |
| >50 to 80mm | .013 | .019 | .030 | .046 | .074 | .120 | .190 | .300 | .460 | 1.900 |
| >80 to 120mm | .015 | .022 | .035 | .054 | .087 | .140 | .220 | .350 | .540 | 2.200 |
| >120 to 180mm | - | - | - | .063 | .100 | .160 | .250 | .400 | .630 | 2.500 |
| >180 to 250mm | - | - | - | .072 | .115 | .185 | .290 | .460 | .720 | 2.900 |
| >250 to 315mm | - | - | - | .081 | .130 | .210 | .320 | .520 | .810 | 3.200 |