Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B5731 found under Holder Electrical C by Laselco Pacific. The National Stock Number assigned to this part is 5977012704495, 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 B5731.