Honeywell Sperian® to 40MM NATO (RD40x1/7) Adapter

This prototype design for a legacy Honeywell Sperian® respirator to 40MM NATO (RD40x1/7/DIN) gas mask thread adapter. Designed to help cross compatibility of commercial off the shelf (COTS) filters with other manufacturer’s respirators, during this PPE shortage, should be compatible with any RD40x1/7 filter canisters.

Part Description:

HONEYWELL_SPERIAN_TO_40MM_NATO_ADAPTER_GEN1.stl

Sized female threads based on male threads provided from midnightsmith in his Sperian® to 3M™ adapter, clearance for threads 0.16 mm.
https://www.thingiverse.com/thing:4263683

Disclaimers/Risks:

1.) Requires 40 mm OD gasket or o-ring on the interior RD40x1/7 pocket and 30 mm OD gasket or O-ring on Sperian ~M30X1.8 pocket to ensure proper seal maintained between cartridge and threads.

3.) 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 return to normal users should purchase OEM OSHA/NIOSH/EN standard approved adapters and respirator accessories.

Dev. Notes:

04/21/2020 – Initial model release. In work, pending support 3D printing community for any fitment and model revisions.

Credits:

Thanks to midnightsmith publishing his 3M™ version of this legacy Sperian® respirator filter adapter.