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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 2026-09-28.

220

High risk

4,993

Elevated

20,143

Watch

9,976

With an open solicitation now

By supply class

All classes ←
4820 Valves, Nonpowered 1286 · 13 high
5330 Packing And Gasket Materials 1036 · 12 high
5340 Hardware, Commercial 1209 · 7 high
1560 Airframe Structural Components 463 · 7 high
4730 Hose, Pipe, Tube, Lubrication, And Railing Fittings 845 · 6 high
5935 Connectors, Electrical 778 · 6 high
4710 Pipe, Tube And Rigid Tubing 271 · 5 high
6140 Batteries, Rechargeable 101 · 5 high
5306 Bolts 512 · 4 high
5365 Bushings, Rings, Shims, And Spacers 412 · 4 high
5995 Cable, Cord, And Wire Assemblies: Communication Equipment 307 · 4 high
5325 Fastening Devices 298 · 4 high
5360 Coil, Flat, Leaf, And Wire Springs 283 · 4 high
4810 Valves, Powered 279 · 4 high
5998 Electrical And Electronic Assemblies, Boards, Cards, And Associated Hardware 190 · 4 high
4930 Lubrication And Fuel Dispensing Equipment 50 · 4 high
8465 Individual Equipment 32 · 4 high
5305 Screws 893 · 3 high
1680 Miscellaneous Aircraft Accessories And Components 295 · 3 high
6130 Converters, Electrical, Nonrotating 127 · 3 high
4130 Refrigeration And Air Conditioning Components 121 · 3 high
5342 Hardware, Weapon System 115 · 3 high
5970 Electrical Insulators And Insulating Materials 111 · 3 high
5962 Microcircuits, Electronic 109 · 3 high
4310 Compressors And Vacuum Pumps 107 · 3 high
5310 Nuts And Washers 830 · 2 high
4720 Hose And Flexible Tubing 503 · 2 high
5930 Switches 461 · 2 high
3040 Miscellaneous Power Transmission Equipment 381 · 2 high
4320 Power And Hand Pumps 315 · 2 high

How the score is built

AAC V (terminal, no replacement) 40 · AAC Y 30 · AAC X 25 · single source whose SAM registration has expired 45 · every verifiable source expired 35 · one active source 15, and 10 more if its SAM renewal is due within 90 days · FLIS marks every source CAGE inactive 15 · solicited this year, last award 3+ years ago 15 (no award on record 10) · a restricted AMSC on the latest solicitation adds a quarter. High is 60 and up, Elevated 35, Watch 15.

Sources: FLIS reference and management data, SAM.gov entity registrations, DLA DIBBS solicitations and awards. Same list for every reader. Data, not advice.

28 stock numbers

NSN	Item	Risk	Why	Sources	Last award	Open
6635-01-415-9101	Probe Set,Eddy Curre	High 62	every approved source we can verify in SAM has expired (1 of 2; 1 unverified); solicited in the last 12 months; last award Jan 2017; AMSC L on the latest solicitation: only approved sources may supply	20 active · 1 expired · 1 unverified	Jan 2017$5,570.06	1 in 12 m
6635-01-735-7169	Detector Kit,Water,A	Elevated 43	single approved source (registered in SAM); that source's SAM registration (4EKX8) is due for renewal by Dec 2, 2026; 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
6635-00-921-6255	Tensiometer,V-Belt	Elevated 43	one active source in SAM out of 5 approved (0 expired, 4 unverified); that source's SAM registration (81337) is due for renewal by Sep 30, 2026; solicited in the last 12 months; no award in our record; AMSC L on the latest solicitation: only approved sources may supply	51 active · 0 expired · 4 unverified	none on record	1 in 12 m
6635-01-615-5182	Test Set Subassembl	Elevated 43	one active source in SAM out of 2 approved (0 expired, 1 unverified); that source's SAM registration (06097) is due for renewal by Oct 3, 2026; solicited in the last 12 months; no award in our record; AMSC R on the latest solicitation: only approved sources may supply	21 active · 0 expired · 1 unverified	none on record	1 in 12 m
6635-01-500-8112	Probe,Eddy Current	Elevated 35	every approved source we can verify in SAM has expired (1 of 2; 1 unverified)	20 active · 1 expired · 1 unverified	May 2026$392.00	1 in 12 m
6635-01-500-8114	Probe,Eddy Current	Elevated 35	every approved source we can verify in SAM has expired (1 of 2; 1 unverified)	20 active · 1 expired · 1 unverified	none on record	—
6635-01-509-4085	Detector,Metal Flaw,Electronic	Elevated 35	every approved source we can verify in SAM has expired (1 of 2; 1 unverified)	20 active · 1 expired · 1 unverified	none on record	—
6635-01-737-5674	Camera,Infrared,Indu	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
6635-01-633-8964	Light,Ultraviolet,Me	Watch 31	one active source in SAM out of 3 approved (0 expired, 2 unverified); that source's SAM registration (20772) is due for renewal by Aug 28, 2026; AMSC D on the latest solicitation: only approved sources may supply	31 active · 0 expired · 2 unverified	Oct 2025$650.00	1
6635-01-124-1582	Tester,Torque Wrench	Watch 31	one active source in SAM out of 3 approved (0 expired, 2 unverified); that source's SAM registration (87641) is due for renewal by Dec 5, 2026; AMSC P on the latest solicitation: only approved sources may supply	31 active · 0 expired · 2 unverified	Nov 2023$8,762.01	1 in 12 m
6635-01-503-0094	Probe,Eddy Current	Watch 31	single approved source (registered in SAM); that source's SAM registration (97499) is due for renewal by Nov 14, 2026; AMSC B on the latest solicitation: only approved sources may supply	11 active · 0 expired · 0 unverified	Aug 2025$221.00	1 in 12 m
6635-41-002-7314	Tensiometer	Watch 31	no approved source on file in FLIS; solicited in the last 12 months; last award Feb 2021; AMSC D on the latest solicitation: only approved sources may supply	00 active · 0 expired · 0 unverified	Feb 2021$969.97	1 in 12 m
6635-00-918-5033	Tester,Spring Resili	Watch 28	single approved source, SAM status unverified; solicited in the last 12 months; last award Nov 2007; AMSC D on the latest solicitation: only approved sources may supply	10 active · 0 expired · 1 unverified	Nov 2007$37.94	1 in 12 m
6635-01-737-5672	Camera,Infrared,Indu	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
6635-01-421-1465	Tensiometer	Watch 25	single approved source (registered in SAM); that source's SAM registration (39428) is due for renewal by Sep 11, 2026	11 active · 0 expired · 0 unverified	Jun 2025$49.00	1
6635-01-682-2849	X-Ray Apparatus,Radi	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 2026$6,568.00	2 in 12 m
6635-01-519-4298	Transducer,Supersoni	Watch 18	one active source in SAM out of 3 approved (1 expired, 1 unverified); AMSC P on the latest solicitation: only approved sources may supply	31 active · 1 expired · 1 unverified	Aug 2026$737.20	1 in 12 m
6635-01-701-6392	Plate,Imaging,Radiat	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$1,025.00	1 in 12 m
6635-01-074-9979	Tensiometer	Watch 15	one active source in SAM out of 3 approved (1 expired, 1 unverified)	31 active · 1 expired · 1 unverified	Dec 2025$369.98	1
6635-01-583-1321	Meter,Density,Digita	Watch 15	solicited in the last 12 months; last award Aug 2021	22 active · 0 expired · 0 unverified	Aug 2021$168.44	1
6635-01-626-5116	Penetrant Test Pane	Watch 15	single approved source (registered in SAM)	11 active · 0 expired · 0 unverified	May 2026$927.00	1
6635-01-681-8597	Camera,Light	Watch 15	one active source in SAM out of 2 approved (0 expired, 1 unverified)	21 active · 0 expired · 1 unverified	Dec 2025$6,625.50	1
6635-00-527-6507	Tensiometer	Watch 15	one active source in SAM out of 4 approved (0 expired, 3 unverified)	41 active · 0 expired · 3 unverified	Apr 2026$805.00	1 in 12 m
6635-00-573-0824	Tester,Torque Wrench	Watch 15	solicited in the last 12 months; last award Aug 2013	20 active · 0 expired · 2 unverified	Aug 2013$3,732.00	1 in 12 m
6635-01-591-3752	Tensiometer	Watch 15	one active source in SAM out of 4 approved (0 expired, 3 unverified)	41 active · 0 expired · 3 unverified	Jan 2026$1,381.23	1 in 12 m
6635-01-621-7849	Penetrometer	Watch 15	single approved source (registered in SAM)	11 active · 0 expired · 0 unverified	Jun 2026$2,722.07	1 in 12 m
6635-01-722-2682	Probe,Eddy Current	Watch 15	single approved source (registered in SAM)	11 active · 0 expired · 0 unverified	none on record	—
6635-01-723-7955	Detector,Metal Flaw,Electronic	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.