General Tolerance Iso 2768-mk [patched] Review

The following values apply based on the nominal size of the feature: Linear Dimensions (Class m)

This part controls the shape and position of features to ensure proper fit and function. Straightness and Flatness Nominal Length Range (mm) Tolerance (mm) Over 10 to 30 Over 30 to 100 Over 100 to 300 Over 300 to 1000 Over 1000 to 3000 Other Geometrical Controls (Class K) ISO 2768 Tolerance Standards for CNC Machining - JLCCNC general tolerance iso 2768-mk

: Governed by ISO 2768-1 , this defines permissible deviations for linear and angular dimensions, such as lengths, radii, and chamfers. The following values apply based on the nominal

The Ultimate Guide to ISO 2768-mK: Streamlining Your Manufacturing Drawings Ø10 mm: a) m: ±0

Section B (using table) 6. Ø10 mm: a) m: ±0.15 → range 9.85–10.15 mm b) k: ±0.5 → range 9.5–10.5 mm 7. Length 45 mm: a) m: for 30–120 → ±0.2 → 44.8–45.2 mm b) k: for 30–120 → ±0.8 → 44.2–45.8 mm 8. Ø2.5 mm: a) m (≤3) ±0.1 → 2.4–2.6 mm b) k (≤3) ±0.3 → 2.2–2.8 mm 9. Angle 60°: m: ±1.0° → 59.0°–61.0° k: ±3.0° → 57.0°–63.0° If groove requires ±0.05 mm explicit tolerance, that explicit tolerance overrides ISO 2768 for that feature and ISO 2768 does not apply to that groove.

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.

For the designer, using 'mk' cleans up drawings and signals a mature understanding of manufacturing realities. For the machinist, it provides clear, enforceable limits for size and geometry. For the quality engineer, it defines the precise inspection criteria.