Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 172B4315P1 found under Insulator Plate by Ross Milton Co. The National Stock Number assigned to this part is 5970011257517, 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 172B4315P1.