中美粗糙度对照
以下是ISO规定的粗糙度数值及其等级表，美国ANSI的数值及其等级与其相同。粗糙度数值Ra .... .粗糙度等级数 .... 粗糙度数值Ra .... 粗糙度等级数
μm（微米).μin（微英寸）..... ......μm（微米）.μin（微英寸）
50 ...... 2000 .....N12 ............0.8 ...... 32 ...... N6
25 ...... 1000 .....N11.............0.4 ...... 16 ...... N5
12.5.....500 ......N10.............0.2 ...... 8 ....... N4
6.3......250 ......N9..............0.1 ...... 4 ....... N3
3.2......125 ......N8..............0.05 ..... 2 ....... N2
1.6......63 .......N7..............0.025 .... 1 ....... N1
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