Part number B321 appears under 8 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.

3455-00-194-0550 — CUTTER,MILLING,SIDE · FSC 3455
3010-00-174-5633 — COUPLING,SHAFT,FLEXIBLE · FSC 3010
4140-00-829-8765 — FAN,CENTRIFUGAL · FSC 4140
5955-01-029-7044 — CRYSTAL UNIT,QUARTZ · FSC 5955
5342-00-200-3757 — MOUNT,RESILIENT,WEAPON SYSTEM · FSC 5342
3120-01-457-6827 — BUSHING,SLEEVE · FSC 3120
6850-01-051-0581 — CLEANING COMPOUND,OPTICAL LENS · FSC 6850
5365-00-829-0965 — SPACER,RING · FSC 5365