Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2101B5K found under Resistor Variable W by Bunker Ramo Corp. The National Stock Number assigned to this part is 5905008779806, 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 2101B5K.