# CNC Standards Index: ISO, ASME, ASTM, GB, JIS, DIN

> Standards that govern CNC machining: ISO 2768 & 286 tolerances, ASME Y14.5 GD&T, ASTM material specs and GB/JIS/DIN equivalents, with cross-references.

https://www.sinbo-machining.com/wiki/standards/

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# CNC Machining Standards Index
Drawings cite standards; standards drive every dimension, finish, and material callout on a part. This section is a working index: what each major standard actually covers, which clause you usually need, and how the international (ISO, ASME, ASTM), regional (DIN, JIS, EN), and national (GB) systems cross-reference. Why this matters. A drawing that cites “ISO 2768-mK” means a specific tolerance class on every uncited dimension. A drawing that cites “ASME Y14.5-2018” means Concentricity and Symmetry symbols are not to be used. If you don’t know the standard, you don’t know the part. Tolerance & Geometry Standards - [ISO 2768 — General Tolerances Tolerance classes f, m, c and v, the linear and geometrical tolerance tables, IT grades IT01–IT18, and what each class actually costs you in scrap ](https://www.sinbo-machining.com/wiki/tolerances/iso-2768/)
- [ISO 286 — Limits and Fits Clearance, transition and interference, the ISO hole basis, and what H7/g6, H7/k6 and H7/p6 mean on a drawing — including what a shrink or interference fit does to assembly ](https://www.sinbo-machining.com/wiki/tolerances/fit-types/)
- [ASME Y14.5 & ISO 1101 — Geometric Tolerancing The geometric tolerance symbols with feature control frame examples, datum rules and the MMC / LMC / RFS modifiers, and how the ASME and ISO systems differ ](https://www.sinbo-machining.com/wiki/tolerances/gdt/)
Surface & Texture Standards - [ISO 4287, ISO 1302 & ASME B46.1 — Surface Texture What Ra and the other roughness parameters mean, which finish actually reaches which value, and the cost of specifying finer than the part needs ](https://www.sinbo-machining.com/wiki/surface/finishing/)
Material Standards - [ASTM & EN Steel Designations The carbon and alloy steel grades that actually get machined — 1045, 4140, 4340, D2, H13 — how the grade callout changes the machining plan, and what a product-form spec such as A36 or A519 is really specifying ](https://www.sinbo-machining.com/wiki/materials/steel/)
- [ASTM Aluminum Designations 6061, 7075, 5052 and the product-form specs that tell you whether you are looking at plate, sheet, bar or extrusion ](https://www.sinbo-machining.com/wiki/materials/aluminum/)
- [SAE AMS Aerospace Materials Inconel 718, 625 and Hastelloy C-276 — why aerospace drawings cite an AMS number, and what that changes about the machining plan ](https://www.sinbo-machining.com/wiki/materials/superalloys/)
Coating, Certification & Quality Systems - [MIL-A-8625 — Anodizing Type I, II and III, class and dye-seal designations, and the dimensional consequence of a coating that adds thickness to a toleranced feature ](https://www.sinbo-machining.com/wiki/surface/anodizing/)
- [ISO 9001, AS9100, IATF 16949 & ISO 13485 What each quality system adds on top of ISO 9001, which industry expects it, and what it means for the supplier you are actually auditing ](https://www.sinbo-machining.com/wiki/quality/certifications/)
- [AS9102 — First Article Inspection Why FAI reports get rejected, the report forms involved, and the balloon numbering conventions a buyer checks before accepting the paperwork ](https://www.sinbo-machining.com/wiki/quality/as9102-fai-rejection-reasons/)
Material Certification - [EN 10204 — Material Test Reports The difference between a 3.1 and a 3.2 certificate, who is allowed to sign each, and when a customer can insist on one over the other ](https://www.sinbo-machining.com/wiki/quality/en10204-material-certificate-guide/)
- [AIAG PPAP Which of the 18 elements apply to machined parts, the common rejection reasons, and when the automotive industry demands a submission at all ](https://www.sinbo-machining.com/wiki/quality/ppap-submission-cnc-automotive/)
Reading standards. Most standards cost money, but the scope clause and the table of contents are usually available free from ISO/ASME. We cite the clause numbers we use, so even without buying the full standard you can usually find what you need from the public scope + Wikipedia + this wiki. Always cite the standard and the edition year on your drawing.