NEMA Standard Electric Motor Key Slot Size vs Shaft Size
| (U) |
(R) |
(S) |
| 3/8 |
21/64 |
flat |
| 1/2 |
29/64 |
flat |
| 5/8 |
33/64 |
3/16 |
| 7/8 |
49/64 |
3/16 |
| 1-1/8 |
63/64 |
1/4 |
| 1-3/8 |
1-13/64 |
5/16 |
| 1-5/8 |
1-13/32 |
3/8 |
| 1-7/8 |
1-19/32 |
1/2 |
| 2-1/8 |
1-27/32 |
1/2 |
| 2-3/8 |
2-1/64 |
5/8 |
| 2-1/2 |
2-3/16 |
5/8 |
| 2-7/8 |
2-29/64 |
3/4 |
| 3-3/8 |
2-7/8 |
7/8 |
| 3-7/8 |
3-5/16 |
1 |
The shaft key a piece of steel used to prevent mechanical slip by locking the power shaft and the load device together. The keyway is a slot in the shaft and the load device to accommodate the key.
Shaft diameters of 1/2 inch or less have a flat spot om the shaft where a set screw can be set.
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