Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SST 48 20M FR found under Insulation Sleeving Electrical by Sigmaform Corp. The National Stock Number assigned to this part is 5970011896935, and the Federal Supply Class is 5970 Electrical Insulators And Insulating Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SST 48 20M FR.