If you have ever looked at a technical drawing, you have likely seen a small, unassuming box in the title block that reads: “General Tolerances: ISO 2768-mK” or “ISO 2768-fH” .
Disclaimer: This post is for informational purposes. Always consult the official ISO document for legal and contractual compliance. iso 2768 standard pdf
Simply put: You cannot realistically put a tolerance on every single corner, chamfer, hole depth, or angle in a complex part. If you tried, the drawing would be unreadable. Instead, you use ISO 2768. It applies to all dimensions that do not have a specific tolerance written next to them. If you have ever looked at a technical
You have two ethical options:
ISO 2768 is titled: “General tolerances — Tolerances for linear and angular dimensions without individual tolerance indications.” Simply put: You cannot realistically put a tolerance
If you are in the US, visit ASME.org (they sell the ISO standard as an identical adoption). If you are in the UK, visit BSI Group . In Germany, DIN . These bodies often allow you to view the first 10-15 pages as a "preview" PDF for free. The tolerance tables are usually in those first few pages.