is possible (by European standards) to have two (or more) valid drawings with same drawing number but different revision indexes?

For example:

  • DRW-001 = Some Bolt M20x50
  • DRW-001a = Same bolt but length changed (M20x60)

And then BOM(s) where both (DRW-001, DRW-001a) are used for bolts M20x50 respectively M20x60?

I know this is far from good solution, but it is even legal/valid?

(My 6th sense tells since a new revision is released, all previous versions became invalid. But can't find any stamdard citation supporting my feeling.)



1 Answer 1


Typical ISO practice is the most recently approved and released drawing is valid. A common work around for off the shelf parts, like bolts, is to have one generic drawing number for multiple part numbers that just lists a table of dimensions for a common part. An example for your bolt:


P/N        LENGTH     PITCH
DRW-0011   50         1.5
DRW-0012   50         2
DRW-0013   60         1.5
  • $\begingroup$ I agree with typical practice (I use it too, consider it correct), but I'd like to support my feeling by some hard-evidence from some standard. Only what I've found yet is (ČSN) EN 82045-1 Paragraph 4.5.3 which describes the typical practice. BUT right below is paragraph 4.5.4 which describe opposite system - more than 1 valid revisions in one moment. (I don't have an English version of the standard, so I'm unable to cite it precisely.) $\endgroup$
    – Lluser
    Dec 10, 2020 at 13:40

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