: General tolerances (Series 1) apply to explicitly drawn dimensions that lack individual tolerance indications.
To ensure your manufacturer interprets your designs correctly, follow these documentation standards on your engineering prints: iso 20457 tolerance table pdf
Look for "ISO 20457:2018 – Preview" on the ISO website. The free preview usually includes the scope, the first few pages, and crucially, the main tolerance table . For many internal design purposes, the preview table is sufficient, though you should buy the full standard for legal manufacturing contracts. : General tolerances (Series 1) apply to explicitly
Practical application guidance
If you have specific critical dimensions that require higher precision than the general block, call them out directly on the dimension line (e.g., the first few pages