Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C6557 C6558 found under Connector And Tube by Vacuumatic North America Inc. The National Stock Number assigned to this part is 3610010579497, and the Federal Supply Class is 3610 Printing Duplicating And Bookbinding Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like C6557 C6558.