General Tolerances ISO 2768-2 Calculator

Straightness / Flatness Tolerances

Applicable to straight-line features and flat surfaces. The nominal range refers to the shorter side of the surface or the length of the feature.

Range (mm)	H	K	L
≤ 10	0.02	0.05	0.1
10 – 30	0.05	0.1	0.2
30 – 100	0.1	0.2	0.4
100 – 300	0.2	0.4	0.8
300 – 1000	0.3	0.6	1.2
1000 – 3000	0.4	0.8	1.6

Perpendicularity Tolerances

Applicable to features nominally perpendicular to a datum surface. The nominal range refers to the shorter side of the angle.

Range (mm)	H	K	L
≤ 100	0.2	0.4	0.6
100 – 300	0.3	0.6	1.0
300 – 1000	0.4	0.8	1.5
1000 – 3000	0.5	1.0	2.0

Symmetry Tolerances

Range (mm)	H	K	L
≤ 100	0.5	0.6	0.6
100 – 300	0.5	0.6	1.0
300 – 1000	0.5	0.8	1.5
1000 – 3000	0.5	1.0	2.0

Circular Runout Tolerances

ವರ್ಗ	Tolerance (mm)
H	0.1
K	0.2
L	0.5