NATO / NIOSH CBRN / STANAG 4155 Screw Thread
thingiverse
There are several "gas mask thread" options out there, but none of them truly instill confidence in their adherence to specifications or seamless integration with other components. However, [mfxpyro's design](https://www.thingiverse.com/thing:3875269) lists the correct specifications, I required more detailed documentation. The STANAG 4155 document is notoriously difficult to obtain, but it can currently be accessed through the CDC website at [cdc.gov/niosh/npptl/resources/pressrel/letters/lttr-083007.html], and it's available for download. This design was created to support work related to Boston PANFAB.
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