Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 28W1-2180 found under Resistor Variable W by Servo Instrument Corporation. The National Stock Number assigned to this part is 5905006511673, 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 28W1-2180.