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铸铁平板（JB/T7974-99）(单位:块)
平板是检验机械零件平面度、平行度、直线度等形位公差的测量基准，也可用于精密零件的划线和测量。
| 规格（长X宽）mm |
精度等级 |
备注 |
| 0 |
1 |
2 |
3 |
| 平面度公差(μm) |
| 100X100 |
4.6 |
9.1 |
18.3 |
|
|
| 100X200 |
4.9 |
9.8 |
19.6 |
|
| 200X200 |
5 |
10 |
20.5 |
|
| 200X300 |
5.5 |
11 |
22 |
|
| 300X300 |
5.5 |
11 |
22 |
|
| 300X400 |
6 |
12 |
24 |
|
| 400X400 |
6.5 |
12.5 |
25 |
|
| 400X500 |
6.5 |
13 |
26 |
66 |
| 500X500 |
6.8 |
14 |
28 |
68 |
| 400X600 |
7 |
14 |
27.5 |
70 |
| 500X600 |
7 |
14.2 |
28.5 |
71 |
| 500X800 |
8 |
15.5 |
31 |
78 |
| 600X800 |
8 |
16 |
32 |
80 |
| 600X900 |
8.3 |
16.5 |
33 |
83 |
| 1000X750 |
9 |
18 |
36 |
90 |
| 1000X800 |
9.5 |
19 |
38 |
93 |
| 1000X1000 |
10 |
20 |
40 |
97 |
| 1000X1200 |
10 |
20.5 |
41 |
103 |
| 1000X1500 |
11 |
22 |
45 |
112 |
| 1000X2000 |
|
26 |
52 |
130 |
| 1500X2000 |
|
28 |
56 |
140 |
| 2000X2000 |
|
31 |
61 |
153 |
| 2000X2500 |
|
34 |
67 |
168 |
| 1500X3000 |
|
35 |
70 |
174 |
| 2000X3000 |
|
37 |
74 |
184 |
| 2000X4000 |
|
44 |
88 |
219 |
| 2500X6000 |
|
60 |
120 |
300 |
| 3000X6000 |
|
62 |
124 |
308 |
|
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