Any dimension in the base rail serration also has a nominal distance.
This nominal distance is applicable to :
- distance from the first positioning hole to any serration
- distance from any serration to any other serration
The chart below provides both distance and nominal distance:
| distance (mm) | nominal dimension (mm) |
| 50 | 50,003 |
| 100 | 100,006 |
| 150 | 150,009 |
| 200 | 200,012 |
| 250 | 250,015 |
| 300 | 300,018 |
| 350 | 350,021 |
| 400 | 400,024 |
| 450 | 450,027 |
| 500 | 500,030 |
| 550 | 550,033 |
| 600 | 600,036 |
| 650 | 650,039 |
| 700 | 700,042 |