Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 0025100-503 found under Attenuator Variable by Interstate Electronics Inc. The National Stock Number assigned to this part is 5905008213707, 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 0025100-503.