Cast Iron Bridge Type Straight Edges

Made according to standard JB/T7977-99, material HT250, Working surface made by skiving, Used to test the straightness and flatness of workpiece. Working environment temperature (20 ± 5) ℃。 Type (mm) Straightness and flatness of working surface Precision grade ( μm) 0 1 2 500 × 50 3 6 12 750 × 50 4 8 15 1000 × 50 10 20 1600 × 70 15 30 2000 × 80 18 36 2500 × 90 22 44 3000 × 100 52 3500 × 100 60 4000 × 100 68 5000 × 110 84 6300 × 120 105 8000 × 120