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October 26, 2023 Subject: Application and Interpretation of ISO 2768-mK

This part controls the "form" of the part. For example, "K" ensures a surface stays reasonably flat or straight without needing a specific GD&T callout for every face. The General CNC Machining Tolerance: ISO 2768-mk

: The choice of tolerance class should always be guided by the functional requirements of the part. In some cases, even medium tolerance classes might be too loose.

ISO 2768 is an international standard for . It is designed for parts where dimensional accuracy is not critical enough to warrant an individual tolerance on every single feature.

ISO 2768-1: General Tolerances for Linear and Angular Dimensions (The "m")

For the 'm' class, the allowable deviation depends on the size of the dimension: Nominal Size (mm) Tolerance (± mm) 120 to 400 400 to 1000 External Radii and Chamfer Heights Nominal Size (mm) Tolerance (± mm) ISO 2768-2: Geometrical Tolerances (The 'k')

ISO 2768-1 uses four classes: (fine), m (medium), c (coarse), and v (very coarse). The "m" class is the most common industry standard for CNC machining and general metalwork. Nominal Dimension Range (mm) Tolerance for "m" Class (mm) ±plus or minus Over 3 to 6 ±plus or minus Over 6 to 30 ±plus or minus Over 30 to 120 ±plus or minus Over 120 to 400 ±plus or minus Over 400 to 1000 ±plus or minus Data sourced from standard ISO 2768-1 charts . ISO 2768-2: General Geometrical Tolerances (The "K")

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General Tolerance Iso 2768-mk Site

October 26, 2023 Subject: Application and Interpretation of ISO 2768-mK

This part controls the "form" of the part. For example, "K" ensures a surface stays reasonably flat or straight without needing a specific GD&T callout for every face. The General CNC Machining Tolerance: ISO 2768-mk general tolerance iso 2768-mk

: The choice of tolerance class should always be guided by the functional requirements of the part. In some cases, even medium tolerance classes might be too loose. October 26, 2023 Subject: Application and Interpretation of

ISO 2768 is an international standard for . It is designed for parts where dimensional accuracy is not critical enough to warrant an individual tolerance on every single feature. In some cases, even medium tolerance classes might

ISO 2768-1: General Tolerances for Linear and Angular Dimensions (The "m")

For the 'm' class, the allowable deviation depends on the size of the dimension: Nominal Size (mm) Tolerance (± mm) 120 to 400 400 to 1000 External Radii and Chamfer Heights Nominal Size (mm) Tolerance (± mm) ISO 2768-2: Geometrical Tolerances (The 'k')

ISO 2768-1 uses four classes: (fine), m (medium), c (coarse), and v (very coarse). The "m" class is the most common industry standard for CNC machining and general metalwork. Nominal Dimension Range (mm) Tolerance for "m" Class (mm) ±plus or minus Over 3 to 6 ±plus or minus Over 6 to 30 ±plus or minus Over 30 to 120 ±plus or minus Over 120 to 400 ±plus or minus Over 400 to 1000 ±plus or minus Data sourced from standard ISO 2768-1 charts . ISO 2768-2: General Geometrical Tolerances (The "K")