Part number 866-021 appears under 4 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.

5331-00-250-0227 — O-RING · FSC 5331
5935-01-188-1963 — JACKSCREW,ELECTRICAL CONNECTOR · FSC 5935
7025-01-463-9426 — INTERFACE UNIT,AUTOMATIC DATA PR · FSC 7025
4330-01-488-6458 — SYSTEM RELIEF VALVE · FSC 4330