Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M1377-4007-SS-0 found under Spacer Sleeve by R A F Electronic Hardware Inc. The National Stock Number assigned to this part is 5365015268306, and the Federal Supply Class is 5365 Bushings Rings Shims And Spacers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like M1377-4007-SS-0.