Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BR4-1A09032-501 found under Holder Assembly Ele by Leidos Engineering And Sciences Llc. The National Stock Number assigned to this part is 5977015057920, 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 BR4-1A09032-501.