Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1 2 13 2B HEAVY HEX found under Nut Plain Hexagon by Flomega Industries Inc. The National Stock Number assigned to this part is 5310013812341, 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 1 2 13 2B HEAVY HEX.