National Stock Number
4240-99-701-5789
National Stock Number (NSN) 4240-99-701-5789, or NIIN 997015789, (bonnet,regulator,breathing apparatus) has an unknown assigned date. This NSN does not replace any other NSNs.
There are 2 manufacturer part numbers associated with this NSN. None of the associated part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by one supplier. Today, one supplier is listed as an Active supplier for this NSN. Of the active suppliers, there are no suppliers that are deemed design controlled or valid supply parts.
This part number has not been procured by the US Government in over 5 years.
This NSN is assigned to Item Name Code (INC) 39127. [A METALLIC/NONMETALLIC ITEM DESIGNED TO MATE WITH A REGULATOR BODY FOR PROTECTION PURPOSES. IT MAY ALSO PROTECT A BREATHING APPARATUS COMPONENT FROM THE REGULATOR WHEN THIS ONE HAS SHARP EDGES. IT MAY HAVE AN ORIFICE THROUGH WHICH A ROD, SHAFT, STEM, OR AN ADJUSTING SCREW PASSES.].
This information was last updated on Oct 22, 2025.