(Newall Engineering Co.)

+-----+--------------------------------------------------------------+
| | Tolerances in Standard Holes[1] |
|Class+------------+---------+---------+---------+---------+---------+
| | Nominal | Up to | 9/16"-1"| 1-1/16"-| 2-1/16"-| 3-1/16"-|
| | Diameters | 1/2" | | 2" | 3" | 4" |
+-----+------------+---------+---------+---------+---------+---------+
| | High Limit | +0.0002 | +0.0005 | +0.0007 | +0.0010 | +0.0010 |
| A | Low Limit | -0.0002 | -0.0002 | -0.0002 | -0.0005 | -0.0005 |
| | Tolerance | 0.0004 | 0.0007 | 0.0009 | 0.0015 | 0.0015 |
+-----+------------+---------+---------+---------+---------+---------+
| | High Limit | +0.0005 | +0.0007 | +0.0010 | +0.0012 | +0.0015 |
| B | Low Limit | -0.0005 | -0.0005 | -0.0005 | -0.0007 | -0.0007 |
| | Tolerance | 0.0010 | 0.0012 | 0.0015 | 0.0019 | 0.0022 |
+-----+------------+---------+---------+---------+---------+---------+
| Allowances for Forced Fits |
+-----+------------+---------+---------+---------+---------+---------+
| | High Limit | +0.0010 | +0.0020 | +0.0040 | +0.0060 | +0.0080 |
| F | Low Limit | +0.0005 | +0.0015 | +0.0030 | +0.0045 | +0.0060 |
| | Tolerance | 0.0005 | 0.0005 | 0.0010 | 0.0015 | 0.0020 |
+-----+------------+---------+---------+---------+---------+---------+
| Allowances for Driving Fits |
+-----+------------+---------+---------+---------+---------+---------+
| | High Limit | +0.0005 | +0.0010 | +0.0015 | +0.0025 | +0.0030 |
| D | Low Limit | +0.0002 | +0.0007 | +0.0010 | +0.0015 | +0.0020 |
| | Tolerance | 0.0003 | 0.0003 | 0.0005 | 0.0010 | 0.0010 |
+-----+------------+---------+---------+---------+---------+---------+
| Allowances for Push Fits |
+-----+------------+---------+---------+---------+---------+---------+
| | High Limit | -0.0002 | -0.0002 | -0.0002 | -0.0005 | -0.0005 |
| P | Low Limit | -0.0007 | -0.0007 | -0.0007 | -0.0010 | -0.0010 |
| | Tolerance | 0.0005 | 0.0005 | 0.0005 | 0.0005 | 0.0005 |
+-----+------------+---------+---------+---------+---------+---------+
| Allowances for Running Fits[2] |
+-----+------------+------