Part number 666-5 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.

4720-00-857-1736 — HOSE,NONMETALLIC · FSC 4720
5210-00-277-1619 — GAGE STOCK,THICKNESS · FSC 5210
1630-01-216-5619 — LINING,FRICTION · FSC 1630
6510-01-562-1999 — SKIN GRAFT,HUMAN · FSC 6510
6150-01-388-5975 — LEAD,ELECTRICAL · FSC 6150
5331-01-268-0162 — O-RING · FSC 5331
5950-01-145-3042 — TRANSFORMER · FSC 5950
4820-00-254-8636 — VALVE,GLOBE · FSC 4820
5315-01-196-7925 — PIN,STRAIGHT,HEADLESS · FSC 5315
4730-01-172-7554 — ELBOW,PIPE · FSC 4730