MS standards (Military Standards) originated with the U.S. Department of Defense. Many are now maintained by (formerly SAE Aerospace). MS812021 specifically details:
| Source | Type | Cost | Pros | |--------|------|------|------| | | Official | ~$50–$150 | Most current revision, certified PDF | | IHS Markit (now part of S&P Global) | Reseller | Varies | Historical revisions available | | Techstreet | Reseller | Similar to SAE | Easy search by document number | | Defense Logistics Agency (DLA) | Free (if active/unchanged) | $0 | For legacy MS standards not superseded | ms812021 standard pdf best
Once you download a file claiming to be , run it through this 5-point checklist: MS standards (Military Standards) originated with the U