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Obsolescence watch
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.
28 stock numbers at watch risk
| NSN | Item | Risk | Why | Sources | Last award | Open |
|---|---|---|---|---|---|---|
| 1630-00-107-5546 | Sleeve Assy,Valve | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC R on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 1630-01-457-8677 | Wheel Half,Aircraft | 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 |
| 1630-01-587-1879 | Sleeve, Adjuster | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC R on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 1630-01-601-7816 | Sensor,Anti-Lock Br | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC R on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 1630-01-694-1637 | Wheel Assembly,Aircr | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC C on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 1630-01-700-8194 | Heat Shield,Wheel,Ai | Watch 31 | single approved source (registered in SAM); solicited in the last 12 months; no award in our record; AMSC C on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | none on record | 1 in 12 m |
| 1630-00-006-8709 | Key,Disk Drive,Brake | Watch 30 | single approved source (registered in SAM); solicited in the last 12 months; last award Jul 2014 | 11 active · 0 expired · 0 unverified | Jul 2014$219.01 | 2 in 12 m |
| 1630-00-676-0766 | Sleeve Assembly,Cyl | Watch 28 | single approved source, SAM status unverified; solicited in the last 12 months; last award May 2019; AMSC P on the latest solicitation: only approved sources may supply | 10 active · 0 expired · 1 unverified | May 2019$3,873.00 | 1 in 12 m |
| 1630-00-939-8443 | Fitting,Valve,Brake | Watch 25 | one active source in SAM out of 2 approved (0 expired, 1 unverified); that source's SAM registration (70236) is due for renewal by Dec 9, 2026 | 21 active · 0 expired · 1 unverified | Oct 2025$797.00 | 1 in 12 m |
| 1630-00-939-8450 | Cam,Brake Valve | Watch 25 | one active source in SAM out of 2 approved (0 expired, 1 unverified); that source's SAM registration (70236) is due for renewal by Dec 9, 2026 | 21 active · 0 expired · 1 unverified | Aug 2026$2,063.00 | 1 in 12 m |
| 1630-00-939-8945 | Seat Assy,Brake Cyl | Watch 25 | one active source in SAM out of 2 approved (0 expired, 1 unverified); that source's SAM registration (70236) is due for renewal by Dec 9, 2026 | 21 active · 0 expired · 1 unverified | Apr 2026$1,416.00 | 1 in 12 m |
| 1630-01-553-3044 | Wheel Half Assembly, | Watch 18 | solicited in the last 12 months; last award Feb 2020; AMSC P on the latest solicitation: only approved sources may supply | 33 active · 0 expired · 0 unverified | Feb 2020$1,821.30 | 2 in 12 m |
| 1630-00-137-7037 | Weight,Wheel Balanci | Watch 18 | one active source in SAM out of 2 approved (0 expired, 1 unverified); AMSC R on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | Mar 2025$75.10 | 1 in 12 m |
| 1630-00-167-0644 | Retainer,Grease | Watch 18 | single approved source (registered in SAM); AMSC R on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | Jun 2026$119.15 | 1 in 12 m |
| 1630-00-186-8698 | Plate Assy,Brake | Watch 18 | one active source in SAM out of 3 approved (0 expired, 2 unverified); AMSC C on the latest solicitation: only approved sources may supply | 31 active · 0 expired · 2 unverified | Feb 2026$4,605.55 | 1 in 12 m |
| 1630-00-506-1320 | Cover,Valve,Antiski | Watch 18 | single approved source (registered in SAM); AMSC R on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | Oct 2024$977.00 | 1 in 12 m |
| 1630-00-565-8551 | Wheel,Tail,Swivel | Watch 18 | single approved source (registered in SAM); AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | Jan 2024$1,290.00 | 1 in 12 m |
| 1630-01-120-4788 | Body Assembly | Watch 18 | one active source in SAM out of 4 approved (1 expired, 2 unverified); AMSC P on the latest solicitation: only approved sources may supply | 41 active · 1 expired · 2 unverified | May 2026$6,774.64 | 1 in 12 m |
| 1630-01-261-3090 | Push Rod,Hydraulic B | Watch 18 | single approved source (registered in SAM); AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | Jul 2026$2,019.99 | 1 in 12 m |
| 1630-01-455-1455 | Rotor,Disc Brake | Watch 18 | solicited in the last 12 months; last award Aug 2017; AMSC D on the latest solicitation: only approved sources may supply | 22 active · 0 expired · 0 unverified | Aug 2017$20.87 | 1 in 12 m |
| 1630-01-595-9369 | Cylinder Assembly,Hy | Watch 18 | single approved source (registered in SAM); AMSC C on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | Oct 2024$143.65 | 1 in 12 m |
| 1630-01-673-8451 | Stator Tube,Torque, | Watch 18 | single approved source (registered in SAM); AMSC D on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | Nov 2023$16,077.60 | 1 in 12 m |
| 1630-01-685-5041 | Rim,Wheel,Pneumatic | Watch 18 | one active source in SAM out of 2 approved (0 expired, 1 unverified); AMSC R on the latest solicitation: only approved sources may supply | 21 active · 0 expired · 1 unverified | Jul 2026$17,532.43 | 1 in 12 m |
| 1630-01-714-1562 | Adapter Special | Watch 18 | single approved source (registered in SAM); AMSC R on the latest solicitation: only approved sources may supply | 11 active · 0 expired · 0 unverified | Jul 2026$655.00 | 1 in 12 m |
| 1630-00-780-5815 | Seal,Bearing | Watch 15 | one active source in SAM out of 3 approved (0 expired, 2 unverified) | 31 active · 0 expired · 2 unverified | Jun 2025$573.38 | 1 |
| 1630-01-290-3120 | Plate,Tail Landing | Watch 15 | single approved source (registered in SAM) | 11 active · 0 expired · 0 unverified | Feb 2024$51.45 | 1 in 12 m |
| 1630-00-136-5521 | Piston Assy,Brake S | Watch 15 | single approved source (registered in SAM) | 11 active · 0 expired · 0 unverified | none on record | — |
| 1630-00-511-0006 | Piston Assembly,Brake Valve | Watch 15 | single approved source (registered in SAM) | 11 active · 0 expired · 0 unverified | none on record | — |
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.