40MM NATO to MSA® Bayonet Adapter ============================ This prototype design for a 40 MM NATO, gas mask thread, to MSA® bayonet adapter. The adapter should make RD40x1/7 threaded full face CBRN masks compatible with MSA® Advantage chemical, combination, and particle cartridges.
Part Description: ============ 40MM_TO_MSA_BAYONET_ADAPTER_MONO.stl Single piece construction adapter, for MSA® Advantage filters that do not require clocking.
40MM_TO_MSA_BAYONET_ADAPTER_INNER_SHELL_LOW.stl 40MM_TO_MSA_BAYONET_ADAPTER_OUTER_SHELL_LOW.stl Two piece construction, not just for clocking purposes, but to also allow cross compatibility to outer shell of previous Gen 4 40 MM to 3M™ bayonet adapter. Tolerance are more forgiving, lower, to enable ease of 3D printer variation.
40MM_TO_MSA_BAYONET_ADAPTER_INNER_SHELL_HIGH.stl 40MM_TO_MSA_BAYONET_ADAPTER_OUTER_SHELL_HIGH.stl Two piece construction, not just for clocking purposes, but to also allow cross compatibility to previous outer shell of Gen 3 40 MM to 3M™ bayonent adapter. Higher tolerance parts requiring proper scaling and calibrated 3D printer.
40MM_TO_MSA_BAYONET_ADAPTER_MONO_GEN2.stl 40MM_TO_MSA_BAYONET_ADAPTER_INNER_SHELL_LOW_GEN2.stl 40MM_TO_MSA_BAYONET_ADAPTER_OUTER_SHELL_LOW_GEN2.stl 40MM_TO_MSA_BAYONET_ADAPTER_INNER_SHELL_HIGH_GEN2.stl 40MM_TO_MSA_BAYONET_ADAPTER_OUTER_SHELL_HIGH_GEN2.stl Gen. 2 features engraved markings to identify adapter.
Disclaimers/Risks: =============== 1.) Requires gasket/o-ring, below bayonet to ensure proper seal between cartridge and bayonet. Source a gasket or O-ring with a nominal diameter of 25.5 mm or ~1.00".
2.) 3D printing materials are not resistant to many solvents, are water soluble, and degrade when exposed to chemicals. 3D printing this adapter is only a temporarily ad-hoc solution against biological threats. Once supply chain returns to normal, users should purchase OEM OSHA/NIOSH/EN standard approved adapters and respirator accessories.
Dev. Notes: ========= 04/06/2020 - Initial model release. In work, pending support and feedback from 3D printing community for any fitment and model revisions.
04/14/2020 - Updated with engraved markings to easily differentiate between adapters.
Credits: ====== Thanks to firescale for just releasing a MSA® to 3M™ bayonet adapter that allowed me to pull reference MSA® bayonet geometry.