Part number 21-2-5 appears under 36 stock numbers

Manufacturers reuse part numbers across items. Each stock number below is its own federal item record — pick the one your drawing or solicitation cites.

5960-00-860-7709 — SHIELD,ELECTRON TUBE · FSC 5960
5331-00-444-0850 — O-RING · FSC 5331
5975-00-100-8706 — BUSHING,ELECTRICAL CONDUIT · FSC 5975
5975-00-177-6408 — BOX CONNECTOR,ELECTRICAL · FSC 5975
4310-00-875-8188 — FILTER ELEMENT,INTAKE AIR CLEANE · FSC 4310
5210-01-139-7444 — TAPE,MEASURING · FSC 5210
3110-00-100-4470 — BEARING,ROLLER,TAPERED · FSC 3110
5120-00-756-2209 — BIT,SCREWDRIVER · FSC 5120
6515-01-422-6153 — COOLER,CRYOTHERAPY · FSC 6515
5331-00-006-2430 — O-RING · FSC 5331
4820-00-822-0652 — VALVE,GATE · FSC 4820
5120-01-430-5690 — BIT,SCREWDRIVER · FSC 5120
5999-00-502-4746 — CLAMP,ELECTRICAL · FSC 5999
6810-00-281-8804 — CADMIUM OXIDE · FSC 6810
6810-00-241-4752 — POTASSIUM OXALATE · FSC 6810
5940-00-127-9997 — TERMINAL,QUICK DISCONNECT · FSC 5940
5331-01-132-1556 — O-RING · FSC 5331
5340-01-415-6702 — STANDOFF,THREADED,SPACING · FSC 5340
5210-01-397-3211 — TAPE,MEASURING · FSC 5210
5950-00-648-5621 — TRANSFORMER,POWER,VIBRATOR · FSC 5950
6675-01-022-8454 — POINT,SCRIBING INSTRUMENT · FSC 6675
5963-01-431-6816 — OSCILLATOR,NONCRYSTAL CONTROLLED · FSC 5963
3510-01-229-3696 — BASKET ASSEMBLY,LAUNDRY · FSC 3510
5930-00-548-3038 — SWITCH,ROTARY · FSC 5930
5975-00-518-0275 — RACK,CABLE,UNDERGROUND · FSC 5975
5330-01-243-9906 — GASKET · FSC 5330
5340-00-944-5583 — SHIELD,EXPANSION · FSC 5340
5895-01-620-3478 — COMMUNICATION SET,SATELLITE · FSC 5895
6515-01-615-5000 — CUFF,SPHYGMOMANOMETER · FSC 6515
5331-01-556-0445 — O-RING · FSC 5331
6610-00-511-3320 — DIAPHRAGM ASSY,INDI · FSC 6610
5340-01-733-4816 — BRACKET,MOUNTING · FSC 5340
6540-01-626-6260 — RABIN SUPER VISION · FSC 6540
5360-01-222-7955 — SPRING,HELICAL,COMPRESSION · FSC 5360
4810-00-198-7484 — SEAL BONNET,VALVE · FSC 4810
5310-00-140-2135 — WASHER,LOCK · FSC 5310