Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P420 found under Nut Self Locking Hexagon by Bae Systems Land And Armaments L P. The National Stock Number assigned to this part is 5310000503267, 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 P420.