Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1A99638 found under Holder Electrical Contact Brush by Teco Westinghouse Motor Company. The National Stock Number assigned to this part is 5977013780552, 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 1A99638.