. It covers geometrical tolerances like flatness, straightness, and perpendicularity. "K" is a medium-grade class, balancing accuracy with manufacturing costs. Why should you use it? Cleaner Drawings: You don't have to clutter your CAD files with ±0.1 on every single line. Global Language: Whether your part is made in Berlin or Bangkok, "fK" means the same thing to every engineer. Cost Control: By using general tolerances for non-critical areas, you avoid over-specifying and driving up the price of your parts. Pro Tip: If you’re designing a part with critical fits (like a bearing housing), always specify those tighter tolerances individually. For everything else? Let
Please consult the full ISO 2768 standard for detailed definitions, examples, and applications to ensure you're applying it correctly for your specific use case. iso 2768 fk
ISO 2768 defines several tolerance classes, including: Why should you use it