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Home >> Products >> Straight edge
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 ( μm) |
| 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 × 50 |
|
12 |
24 |
|
18 |
36 |
| 1600 × 70 |
|
15 |
30 |
|
20 |
40 |
| 2000 × 80 |
|
18 |
36 |
|
27 |
54 |
| 2500 × 80 |
|
|
44 |
|
|
65 |
| 3000 × 100 |
|
|
52 |
|
|
78 |
| 3500 × 100 |
|
|
60 |
|
|
90 |
| 4000 × 100 |
|
|
68 |
|
|
100 |
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