Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CR-5937 found under Nut Self Locking Assembled Washe by Alcoa Global Fasteners Inc. The National Stock Number assigned to this part is 5310004025711, 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 CR-5937.