DIN 874 - Tolerance of flatness and parallelism

Flatness of a measuring beam

Accuracy grade	00	0	1	2
Tolerance of flatness	1+L/150	2+L/100	4+L/60	8+L/40
Tolerance of parallelism	(1+L/150)*2	(2+L/100)*2	(4+L/60)*2	(8+L/40)*2
L (mm)	Tolerance accuracy 00 (µm)	Tolerance accuracy 0 (µm)	Tolerance accuracy 1 (µm)	Tolerance accuracy 2 (µm)
500	4	7	12	21
750	6	9	17	27
1.000	8	12	21	33
1.500	11	17	29	46
2.000	14	22	37	58
2.500	18	27	46	71
3.000	21	32	54	83
4.000	28	42	71	108
5.000	34	52	87	133