Part number 21904 appears under 10 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.

3020-00-269-9687 — GEAR,SPUR · FSC 3020
5310-00-741-1379 — NUT,PLAIN,OCTAGON · FSC 5310
1650-00-083-4040 — PISTON,LINEAR ACTUATING CYLINDER · FSC 1650
5940-01-089-2540 — TERMINAL,STUD · FSC 5940
5965-00-404-0486 — SHELL,MICROPHONE · FSC 5965
5930-00-101-2298 — SWITCH,THERMOSTATIC · FSC 5930
3460-01-360-0376 — ARBOR,HOLE SAW · FSC 3460
5342-01-011-0229 — HANDLE,HANDWHEEL · FSC 5342
4810-01-049-3723 — PLUNGER,VALVE · FSC 4810
4330-00-478-6574 — FILTER,SPECIAL · FSC 4330