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cast iron straight edges
Model: CH024
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Made according to standard JB/T7977-99, material HT250, working surface made by skiving or precise rubbing. Used to test the straightness and flatness of workpiece and equipment installing. Working environment temperature (20 ? 5) ????
Type (mm) Straightness and flatness
of working surface Parallelism between working surfaces
Precision grade ( ?m)
0 1 2 0 1 2
500 ? 35 3 6 12 4.5 9 18
750 ? 40 4 8 15 6 12 25
1000 ? 50 5 10 20 7.5 15 30
1250 ? 5012 24 18 36
1600 ? 7015 30 20 40
2000 ? 8018 36 27 54
2500 ? 80 44 65
3000 ? 100 52 78
3500 ? 100 60 90
4000 ? 100 68 100
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