Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 91R12S12C found under Box Shipping by Tharco Containers Colorado Inc. The National Stock Number assigned to this part is 8115011120544, and the Federal Supply Class is 8115 Boxes Cartons And Crates. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 91R12S12C.