Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4C1-150 found under Nut Blank by Eastman Machine Co. The National Stock Number assigned to this part is 5310015029615, 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 4C1-150.