Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A2550-68001B found under Resistor Fixed Wire Wound Noninductive by A Vox Systems Inc. The National Stock Number assigned to this part is 5905004889741, and the Federal Supply Class is 5905 Resistors. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A2550-68001B.