Detailed Description  TYPE (mm) Flatness of working surface Parallelism between v slot and bottom surface Parallelism between v slot and side surface Parallelism between v slot and side surface Squatreness between v slot and surface  Squatreness between v slot and bottom surface  Height difference of v slot within a matched pair Precision grade (µm) 0 1 0 1 0 1 0 1 0 1 0 1 0 1 40×90° 1 2 3 6 3 6 5 10 5 5 3 6 4 6 63×90° 2 3 4 8 4 8 8 16 8 8 4 8 5 10 100×90° 2 4 4 8 4 8 8 16 8 8 4 8 5 10 160×90° 2.5 5 5 10 5 10