Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 81500001 found under Nut Self Locking Spline by Aish Technologies Ltd. The National Stock Number assigned to this part is 5310013922038, 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 81500001.