Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BA90313-5 found under Insulator Washer by American Telephone And Telegraph Co. The National Stock Number assigned to this part is 5970002809496, 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 BA90313-5.