ISO 2768 General Tolerance Lookup

Quickly determine unindicated linear, broken edge, and angular tolerances for machined parts per ISO 2768-1.

Tolerance Results

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Min Limit -
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About the ISO 2768 General Tolerance Lookup

Quickly find the correct standard manufacturing tolerances for linear and angular dimensions on technical drawings. Mechanical engineers and CNC machinists can look up ISO 2768 allowances for fine, medium, coarse, and very coarse classes instantly. Streamline blueprint creation and quality inspections by replacing heavy reference manuals with an immediate, precise digital lookup.

How it works

  1. Select the tolerance class specified in your drawing's title block (f, m, c, or v).
  2. Choose the type of physical dimension (linear, angular, or broken edge/chamfer).
  3. Enter the nominal dimension value taken from your CAD model or blueprint.
  4. Retrieve the exact upper and lower deviation limits required for machining or inspection.

Frequently asked questions

What do the tolerance classes f, m, c, and v indicate?

These represent the four general tolerance classes established in ISO 2768-1: fine (f), medium (m), coarse (c), and very coarse (v). Medium is widely considered the standard default for general CNC machining and metalwork.

Does the ISO 2768 standard dictate geometric tolerances like flatness?

ISO 2768-1 specifically covers linear and angular dimensions. Geometric tolerances, including straightness, flatness, and symmetry, are addressed in part 2 of the standard (ISO 2768-2), which utilizes classes H, K, and L.

How should ISO general tolerances be designated on a technical drawing?

The standard dictates adding a single declarative note in or near the title block, such as 'ISO 2768-m' (for linear/angular) or 'ISO 2768-mK' (for linear/angular and geometric), eliminating the need to tolerance every individual dimension.

Is the ISO 2768 standard obsolete?

While heavily relied upon in legacy blueprints, ISO 2768 is gradually being phased out and replaced by ISO 22081 for general geometrical and dimensional product specifications. However, ISO 2768 remains functionally essential across modern manufacturing supply chains.

References