Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ZL4253-6-02 found under Nut Self Locking Cl by Harvard Industries Inc. The National Stock Number assigned to this part is 5310004563144, 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 ZL4253-6-02.