Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4-18449 IT 19 found under Washer Seal by Hyde Corp. The National Stock Number assigned to this part is 5310014367212, 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 4-18449 IT 19.