Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 256 NKS 056 found under Nut Plain Clinch by Precision Metal Products Inc. The National Stock Number assigned to this part is 5310013964299, 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 256 NKS 056.