Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DIN988-S40X50 found under Spacer Ring by Din Deutsches Institut Fuer Norm. The National Stock Number assigned to this part is 5365121742626, 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 DIN988-S40X50.