Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MS20257H1-449 found under Leaf Butt Hinge by Dayton Granger Inc. The National Stock Number assigned to this part is 5340008899045, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MS20257H1-449.