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