±30' for lengths up to 50mm.
Table 1: General Tolerances for Linear Dimensions (Except Broken Edges)
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A well-drafted feature utilizes ISO 2768 to reduce drawing clutter while ensuring functional precision for critical areas. ISO 2768 Tolerance Standard: Classes, Tables & How to Apply
The Definitive Guide to ISO 2768 General Tolerances: Download Your Exclusive PDF Tables iso 2768 general tolerances pdf exclusive
Applies to rotating features. Class H allows 0.1 mm; Class K allows 0.2 mm; Class L allows 0.5 mm. How to Indicate ISO 2768 on a Drawing
ISO 2768 sets global standards for general linear, angular, and geometric tolerances in manufacturing, covering f, m, c, and v classes for linear dimensions and H, K, L for geometrical features. While ISO 2768-1 remains active, ISO 2768-2 has been withdrawn and replaced by ISO 22081, though both are used for streamlining technical drawings, says What is ISO 2768? | CNC Machining Tolerance Standards
The 2025 revision expands the nominal size range and clarifies the "two-point size" measurement requirement, which is essential for engineers to understand.
You can download the ISO 2768 standard from the official ISO website or other authorized sources. ±30' for lengths up to 50mm
: Applied to rough components with wide acceptable variations. Part 2: Geometrical Tolerances for Features (ISO 2768-2)
These apply to external sizes, internal sizes, steps, diameters, and radii. Nominal Size Range (mm) Medium (m) Coarse (c) Very Coarse (v) Over 3 to 6 Over 6 to 30 Over 30 to 120 Over 120 to 400 Over 400 to 1000 Over 1000 to 2000 Over 2000 to 4000 2. External Radii and Chamfer Heights
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Perpendicularity rules use the longer of the two sides forming the right angle as the reference baseline. Max variance of 0.2 mm to 0.6 mm. Class K: Max variance of 0.4 mm to 1.0 mm. Class L: Max variance of 0.6 mm to 2.0 mm. Symmetry and Run-out Class H allows 0
Most general mechanical engineering applications utilize the "m" (medium) class.
Symmetry tolerances apply to features that share a common central plane. Nominal Length Range (mm) 100 to 300 300 to 1000 1000 to 3000 How to Indicate ISO 2768 on a Drawing
General tolerances for Class H are 0.5 mm, Class K is 0.6 mm, and Class L is 0.8 mm (applicable across a nominal length of up to 1000 mm). How to Read the Code: Deciphering "ISO 2768-mK"