Why Does the Revision Matter When Specifying an EN / ASTM / AMS Standard?

Standards and specifications such as EN, ASTM and AMS are updated at intervals. Between revisions, chemical limits, mechanical values, testing and inspection requirements or the scope may change.

How is the revision shown?

• EN standards: With the year of publication (e.g. EN 10204:2004).
• ASTM standards: With the year of publication next to the standard number (e.g. ASTM B348/B348M-xx).
• AMS specifications: With the revision letter (e.g. AMS 4928W).

Why does it matter?

• If a customer specification or drawing refers to a particular revision, material produced to a different revision may not be accepted.
• Some revisions introduce new testing or inspection requirements.
• In long-running projects, the revision valid at the start of the project may be the one that applies.

How should it be stated in a request?

• Write the standard or specification together with its revision.
• If a specific revision is not mandatory, state whether the “current revision” is acceptable.
• Check that the revision declared on the certificate is the same as in your request.

Conclusion

Revision information directly affects the acceptance process, especially in specification-driven applications such as aerospace, defence and pressure equipment. Stating the revision in the request reduces the risk of misunderstanding and repeat sourcing.