The accuracy of the dedicated rail for the Cross Roller Guide is classified into high accuracy grade (H) and precision grade (P) as shown in table below.
| Accuracy grades | High-accuracy grade | Precision grade |
|---|---|---|
| Symbol | H | P |
| Item | ||
| Parallelism of the raceway against surfaces A and B | As pre picture below | |
| Dimensional tolerance in height E | ±0.02 | ±0.01 |
| Difference in height E1 | 0.01 | 0.005 |
| Dimensional tolerance in width M | 0 -0.2 | 0 -0.1 |
Rail Length and Parallelism of the Raceway