General Tolerance ISO 2768 1 & 2 - Part 1 - General Tolerances ISO 2768-1

Oct 23, 2026

General tolerances defined by ISO 2768 simplify drawing indications by assigning permissible deviations to four precision classes (f, m, c, v) and applying them to linear and angular dimensions. The document specifies when to reference ISO 2768 and the class letter in or near the title block. It provides tolerance tables for linear dimensions, external radii and chamfer heights, and angular dimensions with deviation ranges based on nominal size, followed by geometric tolerance content in ISO 2768-2.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages5

Reading Time13 min

AccessFree to download

Part 1

General Tolerances ISO 2768-1

Table 1 - Linear Dimensions

Table 2 - External Radii and Chamfer Heights

Table 3 - Angular Dimensions

Part 2

General Tolerances ISO 2768-2

Table 4 - Straightness and Flatness

Table 5 - Perpendicularity

Table 6 - Symmetry

Table 7 - Circular Run-Out

General Tolerance ISO 2768 1 & 2 WWW. DEKMAKE.COM Part 1 General Tolerances ISO 2768-1 ISO 2768-1 is intended to simplify drawing indications and specifies general tolerancesin 4 tolerance classes (f – fine, m – medium, c – coarse, v – very coarse) . It applies for the linear dimensions and angular dimensions such as external sizes, internal sizes, step sizes, diameters, radii, distances, external radii, and chamfer heights for broken edges. If general tolerances in accordance with ISO 2768 shall apply, ISO 2768 followed by the tolerance class (Ex: ISO 2768-m) shall be indicated in or near the title block. The following is the tolerance table corresponding to the 4 class precision levels, you can choose the most suitable one according to machining capabilities and your design requirements. Table 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 | For nominal sizes below 0.5 mm, the deviations shall be indicated adjacent to the relevant nominal size(s) . WWW. DEKMAKE.COM Table 2-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 | For nominal sizes below 0.5 mm, the deviations shall be indicated adjacent to the relevant nominal size(s) . Table 3-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 | ±1º | ±1º | ±1º30′ | ±3º | | over 10 up to 50 | ±0º30′ | ±0º30′ | ±1º | ±2º | | over 50 up to 120 | ±0º20′ | ±0º20′ | ±0º30′ | ±1º | | over 120 up to 400 | ±0º10′ | ±0º10′ | ±0º20′ | ±0º30′ | | over 400 | ±0º5′ | ±0º5′ | ±0º10′ | ±0º20′ | WWW. DEKMAKE.COM Part 2 General Tolerances ISO 2768-2 ISO 2768-2 is for simplifying drawing and fixes general tolerances in 3 tolerance classes (H, K, and L), this part including General Geometrical Tolerances range of flatness & straightness, cylindricity, and circularity. You can check the tolerance chart below: Table 4-General Tolerances on Straightness and Flatness | Ranges of nominal lengths in mm | Tolerance Class | | | | --- | --- | --- | --- | | | H | K | L | | up to 10 | 0.02 | 0.05 | 0.1 | | above 10 to 30 | 0.05 | 0.1 | 0.2 | | above 30 to 100 | 0.1 | 0.2 | 0.4 | | above 100 to 300 | 0.2 | 0.4 | 0.8 | | above 300 to 1000 | 0.3 | 0.6 | 1.2 | | above 1000 to 3000 | 0.4 | 0.8 | 1.6 | Table 5-General Tolerances on Perpendicularity | Ranges of nominal lengths in mm | Tolerance Class | | | | --- | --- | --- | --- | | | H | K | L | | up to 10 | 0.2 | 0.4 | 0.6 | | above 10 to 30 | 0.3 | 0.6 | 1.0 | | above 30 to 100 | 0.4 | 0.8 | 1.5 | | above 100 to 300 | 0.5 | 1.0 | 2.0 | WWW. DEKMAKE.COM Table 6-General Tolerances on Symmetry | Ranges of nominal lengths in mm | Tolerance Class | | | | --- | --- | --- | --- | | | H | K | L | | up to 10 | 0.5 | 0.6 | 0.6 | | above 10 to 30 | 0.5 | 0.6 | 1.0 | | above 30 to 100 | 0.5 | 0.8 | 1.5 | | above 100 to 300 | 0.5 | 1.0 | 2.0 | Table 7-General Tolerances on Circular Run-Out | Ranges of nominal le

FAQs

What is the purpose of ISO 2768-1 in drawings?

ISO 2768-1 simplifies drawing indications by specifying general tolerances in four precision classes for common linear and angular dimensions.

How should the applicable ISO 2768 tolerance class be shown on a drawing?

If general tolerances in accordance with ISO 2768 apply, indicate ISO 2768 followed by the tolerance class (e.g., ISO 2768-m) in or near the title block.

Which nominal size ranges and tolerances are provided in the tables?

The document provides tolerance values in millimeters for multiple nominal length ranges, covering linear dimensions, external radii/chamfer heights, and angular dimensions, with deviations varying by precision class.

Oct 23, 2026

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