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Resources

ISO 2768 Tolerance Charts

Imperial values are converted using the standard factor: 1 inch = 25.4 mm

ISO 2768 is divided into two parts. Part 1 (ISO 2768-1) covers general tolerances for linear and angular dimensions, while Part 2 (ISO 2768-2) addresses general geometric tolerances. Values are shown in millimeters (mm).

Part 1: Linear Dimensions

Permissible deviations in mm
for ranges in nominal lengths		Tolerance Class Designation (Description)
f
(fine)		m
(medium)		c
(coarse)		v
(very coarse)
0.5 up to 3±0.05±0.1±0.2--
over 3 up to 6±0.05±0.1±0.3±0.5
over 6 up to 30±0.1±0.2±0.5±1.0
over 30 up to 120±0.15±0.3±0.8±1.5
over 120 up to 400±0.2±0.5±1.2±2.5
over 400 up to 1000±0.3±0.8±2.0±4.0
over 1000 up to 2000±0.5±1.2±3.0±6.0
over 2000 up to 4000--±2.0±4.0±8.0

External Radii and Chamfer Heights

Permissible deviations in mm
for ranges in nominal lengths		Tolerance Class Designation (Description)
f
(fine)		m
(medium)		c
(coarse)		v
(very coarse)
0.5 up to 3±0.2±0.2±0.4±0.4
over 3 up to 6±0.5±0.5±1.0±1.0
over 6±1.0±1.0±2.0±2.0

Angular Dimensions

Permissible deviations in mm
for ranges in nominal lengths		Tolerance Class Designation (Description)
f
(fine)		m
(medium)		c
(coarse)		v
(very coarse)
up to 10±1°±1°±1°30'±3°
over 10 up to 50±0°30'±0°30'±1°±2°
over 50 up to 120±0°20'±0°20'±0°30'±1°
over 120 up to 400±0°10'±0°10'±0°20'±0°30'
over 400±0°5'±0°5'±0°10'±0°20'

Part 2: General Geometric Tolerances (ISO 2768-2)

ISO 2768-2 specifies general tolerances for geometric features using tolerance classes H, K, and L, with H being the most precise.

Table 4 - General Tolerances on Straightness and Flatness

Ranges of nominal lengths in mmTolerance Class
HKL
up to 100.020.050.1
above 10 to 300.050.10.2
above 30 to 1000.10.20.4
above 100 to 3000.20.40.8
above 300 to 10000.30.61.2
above 1000 to 30000.40.81.6

Table 5 - General Tolerances on Perpendicularity

Ranges of nominal lengths in mmTolerance Class
HKL
up to 100.20.40.6
above 10 to 300.30.61.0
above 30 to 1000.40.81.5
above 100 to 3000.51.02.0

Table 6 - General Tolerances on Symmetry

Ranges of nominal lengths in mmTolerance Class
HKL
up to 100.50.60.6
above 10 to 300.50.61.0
above 30 to 1000.50.81.5
above 100 to 3000.51.02.0

Table 7 - General Tolerances on Circular Run-Out

Ranges of nominal lengths in mmTolerance Class
HKL
any length0.10.20.5

Tolerance Interpretation

When a dimension is specified with a general tolerance class (e.g., ISO 2768-1 f), the permissible deviation is determined by the dimension's nominal size range. For example, a dimension of 25mm under ISO 2768-1 f would have a permissible deviation of ±0.1mm, as it falls within the 6 to 30mm range.

For angular dimensions, the same principle applies. An angle of 40° under ISO 2768-1 f would have a permissible deviation of ±0°30', as it falls within the 10 to 50° range.

Note that these general tolerances apply only when no specific tolerance is indicated on the drawing. If a dimension has an explicit tolerance, that specific tolerance supersedes the general tolerance.

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