Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 491801 found under Holder Electrical Contact Brush by Ac Valve Inc. The National Stock Number assigned to this part is 5977009181922, 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 491801.