ISO 2768-1 and ISO 2768-2 Tolerances

ISO 2768-1 General tolerances

Part 1: Tolerances for linear and angular dimensions without individual tolerance indications

Table 1 — Permissible deviations for linear dimensions except for broken edges (external radii and chamfer heights, see Table 2) – Values in millimeters
Tolerance class		Permissible deviations for basic size range
Designation	Description	0.5a up to 3	over 3 up to 6	over 6 up to 30	over 30 up to 120	over 120 up to 400	over 400 up to 1000	over 1000 up to 2000	over 2000 up to 4000
f	fine	± 0.05	± 0.05	± 0.1	± 0.15	± 0.2	± 0.3	± 0.5	–
m	medium	± 0.1	± 0.1	± 0.2	± 0.3	± 0.5	± 0.8	± 1.2	± 2
c	coarse	± 0.2	± 0.3	± 0.5	± 0.8	± 1.2	± 2	± 3	± 4
v	very coarse	–	± 0.5	± 1	± 1.5	± 2.5	± 4	± 6	± 8
aFor nominal sizes below 0.5 mm. the deviations shall be indicated adjacent to the relevant nominal size(s).

Table 2 — Permissible deviations for broken edges (external radii and chamfer heights) – Values in millimeters
Tolerance class		Permissible deviations for basic size range
Designation	Description	0.5a  up to 3	over 3 up to 6	over 6
f	fine	± 0.2	± 0.5	± 1
m	medium
c	coarse	± 0.4	± 1	± 2
v	very coarse
aFor nominal sizes below 0.5 mm. the deviations shall be indicated adjacent to the relevant nominal size(s).

Table 3 — Permissible deviations of angular dimensions
Tolerance class		Permissible deviations for ranges of lengths, in millimeters, of the shorter side of the angle concerned
Designation	Description	up to 10	over 10 up to 50	over 50 up to 120	over 120 up to 400	over 400
f	fine	± 1°	± 0°30′	± 0°20′	± 0°10′	± 0°5′
m	medium
c	coarse	± 1°30′	± 1°	± 0°30′	± 0°15′	± 0°10′
v	very coarse	± 3°	± 2°	± 1°	± 0°30′	± 0°20′

ISO 2768-2 General tolerances

Part 2: Geometrical tolerances for features without individual tolerance indications

Table 1 — General tolerances on straightness and flatness – Values in millimeters
Tolerance class	Straightness and flatness tolerances for ranges of nominal lengths
	up to 10	over 10 up to 30	over 30 up to 100	over 100 up to 300	over 300 up to 1000	over 1000 up to 3000
H	0.02	0.05	0.1	0.2	0.3	0.4
K	0.05	0.1	0.2	0.4	0.6	0.8
L	0.1	0.2	0.4	0.8	1.2	1.6

Table 2 — General tolerances on perpendicularity – Values in millimetres
Tolerance class	Perpendicularity tolerances for ranges of nominal lengths of the shorter side
	up to 100	over 100 up to 300	over 300 up to 1000	over 1000 up to 3000
H	0.2	0.3	0.4	0.5
K	0.4	0.6	0.8	1
L	0.6	1.0	1.5	2

Table 3 — General tolerances on symmetry – Values in millimetres
Tolerance class	Symmetry tolerances for ranges of nominal lengths
	up to 100	over 100 up to 300	over 300 up to 1000	over 1000 up to 3000
H	0.5
K	0.6		0.8	1
L	0.6	1	1.5	2

Table 4 — General tolerances on circular run-out – Values in millimetres
Tolerance class	Circular run-out tolerances
H	0.1
K	0.2
L	0.5