Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 37N421WB found under Insulation Sleeving Electrical by Newark Corporation. The National Stock Number assigned to this part is 5970012570520, 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 37N421WB.