Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number TA21-54940B found under Resistor Fixed Wire by R H O Engineering Co. The National Stock Number assigned to this part is 5905008243107, 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 TA21-54940B.