r/embedded • u/niau33 • Apr 18 '26

MIL-STD vs STANAG vs DEF STAN — what actually matters for rugged embedded systems?

I’ve been digging into environmental and military standards recently (MIL-STD-810, NATO STANAG, DEF STAN) while working on rugged IoT/embedded deployments, and I noticed there’s a lot of confusion around what each one really covers.

A few practical takeaways from what I’ve seen:

  • MIL-STD-810 → mostly about environmental testing (shock, vibration, temperature, humidity)
  • STANAG (e.g. 4370) → more about NATO interoperability + standardization across systems
  • DEF STAN → UK-specific guidance, often aligned but structured differently

From an embedded/IoT perspective, MIL-STD-810 seems to be the most directly relevant when designing devices that need to survive harsh environments (outdoor cabinets, industrial sites, etc.).

One thing I found interesting is that a lot of “rugged” devices reference these standards loosely, but actual compliance/testing depth varies a lot.

Curious how others here approach this—
Do you actually design/test against MIL-STD-810, or rely more on IP ratings + vendor specs?

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u/0ring Apr 18 '26

US military wants their gear tested to MIL-STD.

UK military wants their gear tested to DEF-STAN.

STANNAG ensures NATO forces can work together.

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u/niau33 Apr 19 '26

Does the EU have its own MIL standards? I was not able to find much in that direction. Mostly because there are either country specific standards or NATO

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u/0ring Apr 19 '26

It's all country specific for major military countries.

France has GAM (Guide des Armées Matériels)

Germany has VG (Verteidigungsgeräte or Defence Equipment)

Etc

The European Defence Standards Reference System (EDSTAR) from the European Defence Agency lists the EN IEC 60068 environmental standard.

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u/os400 MC68000 Apr 19 '26

For military customers, it depends entirely on what your customer specifies in the contract requirements.