Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MAS-1 found under by Ramko Research Inc. The National Stock Number assigned to this part is 5820011414974, and the Federal Supply Class is 5820 Radio And Television Communication Equipment Except Airborne. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MAS-1.