Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M161S-28-B W found under Indicator Fault Locating by Minelco Inc. The National Stock Number assigned to this part is 6625001734977, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like M161S-28-B W.