Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 257-00011-50 found under Ring Assembly Elect by Kovatch Corp. The National Stock Number assigned to this part is 5977010955206, and the Federal Supply Class is 5977 Electrical Contact Brushes And Electrodes. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 257-00011-50.