Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6603-S found under Connector Plug Fiber Optic by Blue Helix Limited. The National Stock Number assigned to this part is 6060015770205, and the Federal Supply Class is 6060 Fiber Optic Interconnectors. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 6603-S.