Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5B-0637 found under Nut Plain Hexagon by Finning Inc. The National Stock Number assigned to this part is 5310014857437, 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 5B-0637.