General Tolerance - Iso 2768-mk

| Shorter Leg Length (mm) | Tolerance Class H | Tolerance Class K | Tolerance Class L | | :--- | :---: | :---: | :---: | | | 0.20 | 0.40 | 0.60 | | 100 up to 300 | 0.30 | 0.60 | 0.80 | | 300 up to 1000 | 0.40 | 0.80 | 1.00 | | 1000 up to 3000 | 0.50 | 1.00 | 1.20 |

Tight tolerances require specialized tooling, slower machine feeds, and frequent quality inspections. Class "mK" represents a highly achievable, cost-effective standard for standard CNC mills and lathes.

Perpendicularity defines the allowable deviation from a perfect 90-degree angle between two planes or axes. 0.4 mm max deviation. Over 100 to 300 mm: 0.6 mm max deviation. Over 300 to 1000 mm: 0.8 mm max deviation. Over 1000 to 3000 mm: 1.0 mm max deviation. Symmetry and Run-Out general tolerance iso 2768-mk

These tolerances apply to the heights of chamfers and the radii of rounded external corners.

O-ring grooves and sealing surfaces require incredibly tight control over depth and surface finish to prevent leaks. | Shorter Leg Length (mm) | Tolerance Class

The standard represents the "Medium" standard of modern manufacturing. It balances manufacturing cost with functional reliability. By applying this standard, companies reduce drawing clutter, minimize misinterpretation, and ensure that parts are manufactured to a consistent, acceptable quality level.

The tolerance is defined by the longer of the two legs forming the right angle. For class 'K', the permissible deviation is as follows: Over 1000 to 3000 mm: 1

Instructions:

The designation refers to the general geometrical tolerances. It controls features such as straightness, flatness, perpendicularity, and symmetry when specific Geometric Dimensioning and Tolerancing (GD&T) callouts are not used.