Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MDL50B found under Brush Electrical Contact by Ametek Inc. The National Stock Number assigned to this part is 5977004568159, 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 MDL50B.