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) ℃.
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Type (mm)
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Straightness and flatness of working surface
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||
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Precision grade ( μ m)
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|||
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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
|
|
|
132
|