This standard simplifies drawings by providing a set of rules for general tolerances. When a drawing references , it applies standard accuracy limits to all dimensions that do not have explicitly stated tolerances.
Angular deviations are scaled based on the length of the shorter leg of the angle being measured: Length of Shorter Leg (mm) Tolerance Limit (Degrees/Minutes) 120 to 400 ISO 2768-2: Geometrical Tolerances (Class K)
ISO 2768-mK is suitable for parts that require reasonable precision but do not need extremely high-tolerance aerospace or fine-mechanical specifications. Standard milled or turned components. Metal Fabrication: Laser-cut and bent sheet metal. Plastic Injection Molding: Standard functional components. Tolerance Iso 2768 Mk Pdf
General mechanical assemblies where components need to fit together without precise interference or clearance needs. Common Mistakes to Avoid (ISO 2768 MK sdocuments)
Geometrical tolerances control the form and orientation of a part's features. If a drawing requires ISO 2768-mk, the general geometrical tolerances follow class . Table 4: General Tolerances for Straightness and Flatness This standard simplifies drawings by providing a set
Angular deviations are scaled based on the length of the shorter leg of the angle being measured. Length of Shorter Leg (mm) Class m Tolerance Over 10 to 50 ±30' (minutes of a degree) Over 50 to 120 Over 120 to 400 Part 2: Geometrical Tolerances (ISO 2768-2 "k")
is an international standard published by the International Organization for Standardization (ISO). It is titled: "General tolerances — Tolerances for linear and angular dimensions without individual tolerance indications." Standard milled or turned components
: Covers linear and angular dimensions. It features four tolerance classes: f (fine), m (medium), c (coarse), and v (very coarse).
is the backbone of modern mechanical drawing interpretation. It prevents arguments between design and manufacturing. It saves money by allowing standard tolerances on non-critical features.
In simple terms, when a designer draws a part and does not write a specific tolerance next to a dimension (e.g., 10mm), the drawing relies on ISO 2768 to define how much that 10mm can vary. This speeds up drafting, reduces clutter on drawings, and standardizes manufacturing expectations.