Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B57-2620-13 found under Resistor Fixed Film by Drs Power And Control Technologies. The National Stock Number assigned to this part is 5905012449398, 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 B57-2620-13.