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Obsolescence watch: 4140 Fans, Air Circulators, And Blower Equipment
Stock numbers the government still buys whose supply base is thinning. Each one carries the reasons in plain words: the government's own terminal codes, approved sources whose SAM registration has expired, a single source, a registration about to lapse, years of solicitations without an award. A source we cannot verify in SAM is shown as unverified, never counted as gone. Rebuilt nightly; this list is from 2026-09-29.
81 stock numbers at watch risk
| NSN | Item | Risk | Why | Sources | Last award | Open |
|---|---|---|---|---|---|---|
| 4140-01-037-5307 | Housing,Fan | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 |
| 4140-01-154-7033 | Blower | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 |
| 4140-01-302-5258 | Fan,Vaneaxial | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC H on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 |
| 4140-01-481-6833 | Impeller,Fan,Axial | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 |
| 4140-01-602-5058 | Fan,Hydraulic Coolin | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 |
| 4140-01-708-8920 | Impeller,Fan,Axial | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 |
| 4140-01-299-6712 | Fan,Centrifugal | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 2 in 12 m |
| 4140-01-421-3615 | Impeller,Fan,Axial | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 2 in 12 m |
| 4140-00-554-8570 | Fan,Centrifugal | Watch 31 | one active source in SAM out of 6 approved (0 expired, 5 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 61 active · 0 expired · 5 unverified | none on record | 1 in 12 m |
| 4140-00-758-7686 | Impeller,Fan,Axial | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC P on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-037-5387 | Impeller,Fan,Axial | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-106-8952 | Fan,Centrifugal | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC H on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-182-5861 | Impeller,Fan,Centrif | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-193-1814 | Fan,Vaneaxial | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC L on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-227-9721 | Impeller,Fan,Axial | Watch 31 | one active source in SAM out of 3 approved (0 expired, 2 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 31 active · 0 expired · 2 unverified | none on record | 1 in 12 m |
| 4140-01-236-5694 | Impeller,Fan,Axial | Watch 31 | one active source in SAM out of 3 approved (0 expired, 2 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 31 active · 0 expired · 2 unverified | none on record | 1 in 12 m |
| 4140-01-286-0009 | Impeller,Fan,Axial | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-322-8129 | Impeller,Fan,Axial | Watch 31 | one active source in SAM out of 3 approved (0 expired, 2 unverified); solicited in the last 12 months; no award in our record; AMSC R on the latest solicitation: only approved sources may supply | 31 active · 0 expired · 2 unverified | none on record | 1 in 12 m |
| 4140-01-364-5287 | Impeller,Fan,Axial | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-388-8879 | Fan,Tubeaxial | Watch 31 | one active source in SAM out of 2 approved (1 expired, 0 unverified); solicited in the last 12 months; no award in our record; AMSC L on the latest solicitation: only approved sources may supply | 21 active · 1 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-396-5357 | Fan,Vaneaxial | Watch 31 | one active source in SAM out of 5 approved (0 expired, 4 unverified); solicited in the last 12 months; no award in our record; AMSC C on the latest solicitation: only approved sources may supply | 51 active · 0 expired · 4 unverified | none on record | 1 in 12 m |
| 4140-01-420-6508 | Fan,Centrifugal | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-421-3184 | Impeller,Fan,Axial | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-455-9893 | Fan,Vaneaxial | Watch 31 | one active source in SAM out of 4 approved (0 expired, 3 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 41 active · 0 expired · 3 unverified | none on record | 1 in 12 m |
| 4140-01-458-9626 | Fan,Vaneaxial | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-464-7795 | Impeller,Fan,Axial | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-476-7871 | Fan,Circulating | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC L on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-477-7220 | Fan,Vaneaxial | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-483-5520 | Fan Assy,Electronic | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-483-7212 | Fan,Circulating | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC B on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-490-5736 | Fan,Circulating | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-534-1008 | Fan,Tubeaxial | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-545-6800 | Fan,Circulating | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-549-8327 | Fan,Ventilating | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-562-3866 | Fan,Vaneaxial | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-578-3878 | Impeller,Fan,Axial | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-592-9161 | Fan,Centrifugal | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-619-6855 | Fan,Centrifugal | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-641-4713 | Fan,Tubeaxial | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-685-7152 | Fan,Ventilating | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-688-1959 | Fan,Tubeaxial | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-688-7473 | Fan,Tubeaxial | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-691-2226 | Fan Assembly,Centrif | Watch 31 | one active source in SAM out of 3 approved (0 expired, 2 unverified); solicited in the last 12 months; no award in our record; AMSC B on the latest solicitation: only approved sources may supply | 31 active · 0 expired · 2 unverified | none on record | 1 in 12 m |
| 4140-01-691-6069 | Fan,Centrifugal | Watch 31 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-702-5792 | Impeller,Fan,Axial | Watch 31 | one active source in SAM out of 3 approved (0 expired, 2 unverified); solicited in the last 12 months; no award in our record; AMSC C on the latest solicitation: only approved sources may supply | 31 active · 0 expired · 2 unverified | none on record | 1 in 12 m |
| 4140-01-719-5878 | Fan Assembly,Tubeaxi | Watch 31 | one active source in SAM out of 3 approved (0 expired, 2 unverified); solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 31 active · 0 expired · 2 unverified | none on record | 1 in 12 m |
| 4140-00-289-4304 | Fan,Centrifugal | Watch 25 | one active source in SAM out of 5 approved (0 expired, 4 unverified); solicited in the last 12 months; no award in our record | 51 active · 0 expired · 4 unverified | none on record | 1 |
| 4140-99-891-8050 | Fan Assembly,Tubeaxi | Watch 25 | no approved source on file in FLIS; solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 00 active · 0 expired · 0 unverified | none on record | 1 |
| 4140-00-289-8783 | Fan,Vaneaxial | Watch 25 | one active source in SAM out of 5 approved (0 expired, 4 unverified); solicited in the last 12 months; no award in our record | 51 active · 0 expired · 4 unverified | none on record | 1 in 12 m |
| 4140-00-554-8187 | Fan,Vaneaxial | Watch 25 | one active source in SAM out of 7 approved (0 expired, 6 unverified); solicited in the last 12 months; no award in our record | 71 active · 0 expired · 6 unverified | none on record | 1 in 12 m |
| 4140-01-037-5305 | Parts Kit,Fan | Watch 25 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-071-6183 | Fan,Centrifugal | Watch 25 | one active source in SAM out of 4 approved (0 expired, 3 unverified); solicited in the last 12 months; no award in our record | 41 active · 0 expired · 3 unverified | none on record | 1 in 12 m |
| 4140-01-097-4338 | Fan,Tubeaxial | Watch 25 | one active source in SAM out of 3 approved (0 expired, 2 unverified); solicited in the last 12 months; no award in our record | 31 active · 0 expired · 2 unverified | none on record | 1 in 12 m |
| 4140-01-300-8058 | Fan,Vaneaxial | Watch 25 | one active source in SAM out of 4 approved (0 expired, 3 unverified); solicited in the last 12 months; no award in our record | 41 active · 0 expired · 3 unverified | none on record | 1 in 12 m |
| 4140-01-306-8249 | Fan,Circulating | Watch 25 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-589-0141 | Guard,Fan Impeller | Watch 25 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-589-2215 | Blower,Exhaust | Watch 25 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-602-4829 | Fan,Circulating | Watch 25 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-602-4830 | Fan,Circulating | Watch 25 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-612-6182 | Fan Coil Assembly | Watch 25 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-628-3468 | Fan,Tubeaxial | Watch 25 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-662-0219 | Fan,Vaneaxial | Watch 25 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-727-5726 | Fan,Tubeaxial | Watch 25 | one active source in SAM out of 2 approved (0 expired, 1 unverified); solicited in the last 12 months; no award in our record | 21 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-728-0618 | Impeller,Fan,Centri | Watch 25 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-733-9907 | Fan Assembly,Centrif | Watch 25 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-12-388-8920 | Fan,Ventilating | Watch 25 | no approved source on file in FLIS; solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 00 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-15-028-8206 | Cover,Electric Fan | Watch 25 | no approved source on file in FLIS; solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 00 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 4140-01-432-4012 | Fan,Circulating | Watch 22 | single approved source, SAM status unverified; solicited in the last 12 months; no award in our record; AMSC H on the latest solicitation: only approved sources may supply | 10 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-456-0875 | Impeller,Fan,Axial | Watch 22 | single approved source, SAM status unverified; solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 10 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-514-7379 | Fan,Circulating | Watch 22 | single approved source, SAM status unverified; solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 10 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-660-0173 | Fan,Centrifugal | Watch 22 | single approved source, SAM status unverified; solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 10 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-663-5974 | Fan,Circulating | Watch 22 | single approved source, SAM status unverified; solicited in the last 12 months; no award in our record; AMSC D on the latest solicitation: only approved sources may supply | 10 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-12-365-0089 | Fan,Ventilating | Watch 20 | no approved source on file in FLIS; solicited in the last 12 months; no award in our record | 00 active · 0 expired · 0 unverified | none on record | 1 |
| 4140-01-356-2936 | Fan,Tubeaxial | Watch 18 | single approved source, SAM status unverified; solicited in the last 12 months; no award in our record | 10 active · 0 expired · 1 unverified | none on record | 1 |
| 4140-01-568-6658 | Fan Assembly,Centrif | Watch 18 | single approved source, SAM status unverified; solicited in the last 12 months; no award in our record | 10 active · 0 expired · 1 unverified | none on record | 1 |
| 4140-01-647-0691 | Housing,Vaneaxial F | Watch 18 | single approved source, SAM status unverified; solicited in the last 12 months; no award in our record | 10 active · 0 expired · 1 unverified | none on record | 1 |
| 4140-01-660-1314 | Shroud,Fan,Axial | Watch 18 | single approved source, SAM status unverified; solicited in the last 12 months; no award in our record | 10 active · 0 expired · 1 unverified | none on record | 1 |
| 4140-01-732-0418 | Fan,Ventilating | Watch 18 | single approved source, SAM status unverified; solicited in the last 12 months; no award in our record | 10 active · 0 expired · 1 unverified | none on record | 2 in 12 m |
| 4140-01-453-9043 | Fan,Tubeaxial | Watch 18 | single approved source, SAM status unverified; solicited in the last 12 months; no award in our record | 10 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-466-8879 | Shroud,Fan,Axial | Watch 18 | single approved source, SAM status unverified; solicited in the last 12 months; no award in our record | 10 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
| 4140-01-590-5141 | Guard,Fan Impeller | Watch 18 | single approved source, SAM status unverified; solicited in the last 12 months; no award in our record | 10 active · 0 expired · 1 unverified | none on record | 1 in 12 m |
Have one of these on the shelf, or can you make it? List it free and the solicitation lands on your dashboard the morning it posts. Buyers: every NSN page shows the same read with the full source list.