DIN 876 - Tolerance of flatness

Protocol of a flatness measurement

The flatness is specified according to DIN 876. It specifies that all variances of an area must lie within two layers, whose distance specifies the flatness tolerance.

Accuracy grade	00	0	1	2
Tolerance of flatness	2+a/500	4+a/250	10+a/100	20+a/50
a (length) (mm)	Tolerance accuracy 00 (µm)	Tolerance accuracy 0 [µm]	Tolerance accuracy 1 (µm)	Tolerance accuracy 2 (µm)
100	2	4	11	22
200	2	4	12	24
300	3	5	13	26
400	3	6	14	28
500	3	6	15	30
600	3	7	16	33
800	4	7	18	36
1.000	4	8	20	40
1.200	4	9	22	44
1.500	5	10	25	50
2.000	6	12	30	60
2.500	7	14	35	70
3.000	8	16	40	80