Machinery's Handbook, 27th Edition

| Fractional Inch | Decimal Inch | Millimeters | Fractional Inch | Decimal Inch | Millimeters |
|---|---|---|---|---|---|
| 1/64 | 0.015625 | 0.396875 | 0.511811024 | 13 | |
| 1/32 | 0.03125 | 0.79375 | 33/64 | 0.515625 | 13.096875 |
| 0.039370079 | 1 | 17/32 | 0.53125 | 13.49375 | |
| 3/64 | 0.046875 | 1.190625 | 35/64 | 0.546875 | 13.890625 |
| 1/16 | 0.0625 | 1.5875 | 0.551181102 | 14 | |
| 5/64 | 0.078125 | 1.984375 | 9/16 | 0.5625 | 14.2875 |
| 0.078740157 | 2 | 37/64 | 0.578125 | 14.684375 | |
| 1/12 | 0.08 33 [b] | 2.11 66 | 7/12 | 0.58 33 | 14.81 66 |
| 3/32 | 0.09375 | 2.38125 | 0.590551181 | 15 | |
| 7/64 | 0.109375 | 2.778125 | 19/32 | 0.59375 | 15.08125 |
| 0.118110236 | 3 | 39/64 | 0.609375 | 15.478125 | |
| 1/8 | 0.125 | 3.175 | 5/8 | 0.625 | 15.875 |
| 9/64 | 0.140625 | 3.571875 | 0.62992126 | 16 | |
| 5/32 | 0.15625 | 3.96875 | 41/64 | 0.640625 | 16.271875 |
| 0.157480315 | 4 | 21/32 | 0.65625 | 16.66875 | |
| 1/6 | 0.1 66 | 4.2 33 | 2/3 | 0. 66 | 16.9 33 |
| 11/64 | 0.171875 | 4.365625 | 0.669291339 | 17 | |
| 3/16 | 0.1875 | 4.7625 | 43/64 | 0.671875 | 17.065625 |
| 0.196850394 | 5 | 11/16 | 0.6875 | 17.4625 | |
| 13/64 | 0.203125 | 5.159375 | 45/64 | 0.703125 | 17.859375 |
| 7/32 | 0.21875 | 5.55625 | 0.708661417 | 18 | |
| 15/64 | 0.234375 | 5.953125 | 23/32 | 0.71875 | 18.25625 |
| 0.236220472 | 6 | 47/64 | 0.734375 | 18.653125 | |
| 1/4 | 0.25 | 6.35 | 0.748031496 | 19 | |
| 17/64 | 0.265625 | 6.746875 | 3/4 | 0.75 | 19.05 |
| 0.275590551 | 7 | 49/64 | 0.765625 | 19.446875 | |
| 9/32 | 0.28125 | 7.14375 | 25/32 | 0.78125 | 19.84375 |
| 19/64 | 0.296875 | 7.540625 | 0.787401575 | 20 | |
| 5/16 | 0.3125 | 7.9375 | 51/64 | 0.796875 | 20.240625 |
| 0.31496063 | 8 | 13/16 | 0.8125 | 20.6375 | |
| 21/64 | 0.328125 | 8.334375 | 0.826771654 | 21 | |
| 1/3 | 0. 33 | 8.4 66 | 53/64 | 0.828125 | 21.034375 |
| 11/32 | 0.34375 | 8.73125 | 27/32 | 0.84375 | 21.43125 |
| 0.354330709 | 9 | 55/64 | 0.859375 | 21.828125 | |
| 23/64 | 0.359375 | 9.128125 | 0.866141732 | 22 | |
| 3/8 | 0.375 | 9.525 |