Botou Jingda Tools & Measuring Instruments Co. Limited

Type（mm） Perpendicularity between
adjacent measuring
surface Flatness and straightness
of measuring surface Flatness and straightness
of datum surface Precision Grade (μm) 1 2 3 1 2 3 1 2 3 200 × 200 8 16 30 4 8 16 6 12 24 300 × 200 10 20 40 5 10 20 8 16 30 300 × 300 10 20 40 5 10 20 8 16 30 400 × 300 12 24 45 6 12 24 10 20 40 400 × 400 12 24 45 6 12 24 10 20 40 500 × 400 28 50 14 28 24 48 500 × 500 28 50 14 28 24 48