granite V block

granite V block -Black granite material. -Thread holes can be made. -Squareness made according to DIN875. Tpye (mm) Flatness of working surface Parallelism between V slot and bottom surface Parallelism between V slo and side surface Symmetry between V slot and end surface Squareness between V slot and end surface Squareness between V side and bottom surface Height Difference of the v slot with a matched pair Precision grade ( μm) 0 1 0 1 0 1 0 1 0 1 0 1 0 1 63 × 63× 90° 1.5 3 4 8 4 8 8 16 8 8 4 8 5 10 100 × 100 × 90° 2 4 4 8 4 8 8 16 8 8 4 8 5 10 160 × 160 × 90° 2.5 5 5 10 5 10 10 20 10 10 5 10 6 12