Simplified Drawings: By referencing ISO 2768 in the title block, designers can focus only on "critical" dimensions that require tighter control.Cost Efficiency: Manufacturing parts to unnecessarily tight tolerances increases costs. ISO 2768 provides realistic, "workable" ranges for non-critical features.Global Consistency: Since it is an international standard, a drawing made in Europe can be interpreted accurately by a machine shop in Asia or North America.Ease of Inspection: Quality control teams can quickly determine if a part is within acceptable limits using standardized tables. ISO 2768-1: Linear and Angular Dimensions
If your drawing block contains a note like "ISO 2768-m" or "General Tolerances ISO 2768-f," the entire part is governed by these rules.
Straightness, flatness, perpendicularity, symmetry, circular run-out. iso 2768 general tolerances pdf exclusive
The ISO 2768 standard is split into two distinct parts, each covering different geometric characteristics. Part 1: Linear and Angular Dimensions (ISO 2768-1)
Linear dimensions (external sizes, internal sizes, step sizes, diameters, radii) Angular dimensions Broken edges (external radii and chamfers) Simplified Drawings: By referencing ISO 2768 in the
Permissible deviations in mm for ranges of the nominal length of the shorter leg.
If a specific feature on that same drawing requires an incredibly tight fit—like a bearing housing—the designer will manually write a tight tolerance (e.g., If a specific feature on that same drawing
This article is provided for informational purposes only and does not constitute legal advice. All tolerance values presented are based on ISO 2768-1:1989 and ISO 2768-2:1989. For official certification or legal use, always consult and purchase the complete standards from authorized distributors.
Soft materials like plastics, rubber, or soft aluminum expand and warp easily. Machining them to "Fine (f)" specs under ISO 2768 requires specialized thermal environmental controls.
ISO 2768 defines four tolerance classes: