Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HM053-027-1 found under Nut Plain Hexagon by Robertson Fuel Systemsllc. The National Stock Number assigned to this part is 5310016643945, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HM053-027-1.