铸铁研磨平板 （JB/T7974-99）（单位：块）
按JB/T7974-99标准制造，工作面用研磨工艺用于制作的研磨，量具修理，用本产品研磨后的制件表面粗糙度Ra≤0.08μm。
Made according to Standard JB/T7974-99,working surface made by skiving,used for rubbing of workpiece and repairing of measuring tools.The surface roughness of workpiece after wubbing on this plate can reach Ra≤0.08μm.
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| 订货号 | 规格（长×宽）mm | 精度等级 | |||
| 0 | 1 | 2 | 3 | ||
| 平面度公差（um） | |||||
| HT03-057 | 100×100 | 4.6 | 9.1 | 18.3 | |
| HT03-058 | 100×200 | 4.9 | 9.8 | 19.6 | |
| HT03-059 | 200×200 | 5 | 10.3 | 20.5 | |
| HT03-060 | 200×300 | 5.5 | 10.9 | 21.8 | |
HT03-061 |
300×300 | 5.5 | 11.4 | 22.8 | |
| HT03-062 | 300×400 | 6 | 12 | 24 | |
| HT03-063 | 400×400 | 6.5 | 12.5 | 25.1 | |
| HT03-064 | 400×500 | 6.5 | 13.1 | 26.2 | 65.6 |
| HT03-065 | 400×600 | 6.8 | 13.7 | 27.3 | 68.3 |
| HT03-066 | 500×500 | 7 | 13.8 | 27.5 | 68.8 |
| HT03-067 | 500×600 | 7 | 14.2 | 28.5 | 71.2 |
| HT03-068 | 500×800 | 8 | 15.5 | 31 | 78 |