Tolerance accuracy

Surface precision tolerances

Surface Qualities:

DIN 876 /III: shaved / milled
DIN 876 /II: fine shaved / milled
DIN 876 /I: fine milled
DIN 876 /0: closely trimmed and touched up

Flatness Tolerances:

The flatness tolerances give the permissible deviation of the measuring area in µm over the entire length L of the longest edge of the plate at a reference temperature of 20 °C.

DIN 876 /III = 40 + L : 25 = µm
DIN 876 /II = 20 + L : 50 = µm
DIN 876 /I = 10 + L : 100 = µm
DIN 876 /0 = 4 + L : 250 = µm

The surfaces of cast products such as tooling plates, measuring plates, marking plates and surface plates are produced in accordance with DIN 876.

To measure the surface accuracy, the plates are laid onto at least three support points. The plate ribbing constructed for each application transfers the forces that occur during use into the support points to ensure that the deformation of the surfaces to be measured is as low and the surface accuracy as high as possible.

Tolerance Tables
L mm	200	300	500	800	1000	1200	1500	2000	2500
DIN 876 / III	48	52	60	72	80	88	100	120	140
DIN 876 / II	24	26	30	36	40	44	50	60	70
DIN 876 / I	12	13	15	18	20	22	25	30	35
DIN 876 / 0	4,8	5,2	6	7,2	8	8,8	10	12	14

L mm	3000	3500	4000	4500	5000	5500	6000	6500	7000
DIN 876 / III	160	180	200	220	240	260	280	300	320
DIN 876 / II	80	90	100	110	120	130	140	150	160
DIN 876 / I	40	45	50	55	60	65	70	75	80
DIN 876 / 0	16	18	20	22	24	26	28	30	32

Deviations in µm

: Spacing tolerances for threaded drill holes a

: Engine bed of a portal milling machine with connection surfaces and threaded drill holes for guide strips

Spacing tolerances for threaded drill holes a

0 - 2000	± 0,15
2000 - 4000	± 0,20
4000 - 6000	± 0,25
6000 - 8000	± 0,30
(in mm) Other tolerances on request.

: Spacing tolerances for fitment bores a

: Fitment bores in the plate surface

Spacing tolerances for fitment bores a