Inch Rectangular Keyways
All dimensions in inches
| OD | Key | Shaft Keyway | Hub Keyway | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Over | To (incl) | Key Size | W | H | A | B | C | D | R |
| 1 | 1 1/4 | 5/16 x 1/4 | 0.314 0.312 | 0.253 0.250 | 0.312 0.311 | 0.152 0.146 | 0.313 0.312 | 0.118 0.112 | 0.01 |
| 1 1/4 | 1 1/2 | 3/8 x 1/4 | 0.377 0.375 | 0.253 0.250 | 0.375 0.374 | 0.156 0.150 | 0.376 0.375 | 0.114 0.108 | 0.01 |
| 1 1/2 | 1 3/4 | 7/16 x 5/16 | 0.440 0.438 | 0.315 0.312 | 0.438 0.437 | 0.192 0.186 | 0.439 0.438 | 0.141 0.135 | 0.02 |
| 1 3/4 | 2 | 1/2 x 5/16 | 0.502 0.500 | 0.315 0.312 | 0.500 0.499 | 0.196 0.190 | 0.501 0.500 | 0.137 0.131 | 0.02 |
| 2 | 2 1/2 | 5/8 x 7/16 | 0.627 0.625 | 0.441 0.438 | 0.625 0.624 | 0.266 0.260 | 0.626 0.625 | 0.191 0.185 | 0.02 |
| 2 1/2 | 3 | 3/4 x 1/2 | 0.752 0.750 | 0.503 0.500 | 0.750 0.749 | 0.305 0.299 | 0.751 0.750 | 0.215 0.209 | 0.02 |
| 3 | 3 1/2 | 7/8 x 5/8 | 0.877 0.875 | 0.629 0.625 | 0.875 0.874 | 0.376 0.370 | 0.876 0.875 | 0.270 0.264 | 0.06 |
| 3 1/2 | 4 | 1 x 3/4 | 1.003 1.000 | 0.754 0.750 | 1.000 0.999 | 0.447 0.441 | 1.001 1.000 | 0.324 0.318 | 0.06 |
| 4 | 5 | 1 1/4 x 7/8 | 1.253 1.250 | 0.879 0.875 | 1.250 1.248 | 0.524 0.518 | 1.252 1.250 | 0.372 0.366 | 0.06 |
| 5 | 6 | 1 1/2 x 1 | 1.504 1.500 | 1.006 1.000 | 1.500 1.498 | 0.605 0.599 | 1.502 1.500 | 0.418 0.412 | 0.06 |