Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5 601 142 found under Nut Plain Castellated Hexagon by Urdan Industries Usa Inc. The National Stock Number assigned to this part is 5310014995783, 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 5 601 142.