| Nominal Shaft (Arbor) and Keyseat Cutter Hole Diameter |
ARBOR AND KEYSEAT |
Nominal Size Square Key |
Arbor and Keyseat |
| A |
A |
B |
B |
| Max. |
Min. |
Max. |
Min. |
| 1⁄2 |
3⁄32 |
0.0947 |
0.0937 |
0.4531 |
0.4481 |
| 5⁄8 |
1⁄8 |
0.1260 |
0.1250 |
0.5625 |
0.5575 |
| 3⁄4 |
1⁄8 |
0.1260 |
0.1250 |
0.6875 |
0.6825 |
| 7⁄8 |
1⁄8 |
0.1260 |
0.1250 |
0.8125 |
0.8075 |
| 1 |
1⁄4 |
0.2510 |
0.2500 |
0.8438 |
0.8388 |
| 11⁄4 |
5⁄16 |
0.3135 |
0.3125 |
1.0630 |
1.0580 |
| 11⁄2 |
3⁄8 |
0.3760 |
0.3750 |
1.2810 |
1.2760 |
| 13⁄4 |
7⁄16 |
0.4385 |
0.4375 |
1.5000 |
1.4950 |
| 2 |
1⁄2 |
0.5010 |
0.5000 |
1.6870 |
1.6820 |
| 21⁄2 |
5⁄8 |
0.6260 |
0.6250 |
2.0940 |
2.0890 |
| 3 |
3⁄4 |
0.7510 |
0.7500 |
2.5000 |
2.4950 |
| 31⁄2 |
7⁄8 |
0.8760 |
0.8750 |
3.0000 |
2.9950 |
| 4 |
1 |
1.0010 |
1.0000 |
3.3750 |
3.3700 |
| 41⁄2 |
11⁄8 |
1.1260 |
1.1250 |
3.8130 |
3.8080 |
| 5 |
11⁄4 |
1.2510 |
1.2500 |
4.2500 |
4.2450 |
All dimensions given in inches.
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