Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PR3401-1PC81-82 found under Gear Assembly by The Electric Tachometer Corp. The National Stock Number assigned to this part is 6680003141885, 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 PR3401-1PC81-82.