| Class | Name | Typical Application | |-------|------|---------------------| | | Fine | High-precision components, medical devices, precision instruments | | m | Medium | Standard CNC parts, housings, general-purpose machined components | | c | Coarse | Less critical parts, support structures, frames | | v | Very Coarse | Large industrial frames, rough components where precision is not critical |
For professionals searching for the you are likely tired of generic, low-resolution charts or broken links. You need the authoritative standard explained in a way that saves time, reduces scrap rates, and ensures your parts fit on the first try.
Angles are treated specially. For a 90° angle on a large part, a ±0.5° tolerance is massive. ISO 2768-1 uses to determine tolerance. iso 2768 general tolerances pdf exclusive
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.
In a drawing's title block, you will typically see a combination of these classes, such as : m : Medium class for linear dimensions (Part 1). K : Class K for geometrical features (Part 2). General Tolerance Tables (Summary) 1. Linear Dimensions (ISO 2768-1) | Class | Name | Typical Application |
Specifying "ISO 2768-m" allows the machinist to use standard, efficient tools rather than specialized, slow, and expensive precision equipment.
Download the official PDF from your national standards body today. Print it, laminate it, and hang it next to every CMM machine and lathe in your shop. It is the most cost-effective insurance policy against rejected parts you will ever buy. For a 90° angle on a large part, a ±0
To legally enforce general tolerances, the drawing title block must feature a specific note. The note must clearly state the standard designation followed by the chosen tolerance classes from both Part 1 and Part 2. ISO 2768 - [Part 1 Class][Part 2 Class]
The search for usually comes from a place of urgency—a drawing is on the table, a CNC is waiting, and the title block only says "ISO 2768-m."
Sign up for our engineers’ newsletter below to receive a proprietary Excel calculator that automatically computes ISO 2768 tolerances based on your input size and class—no PDF scrolling required.
Determined by the length of the shorter side of the angle. Symmetry: Applies to features with a shared median plane.