Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B21-00565 found under Gear And Shaft by Curtis Straus Llc. The National Stock Number assigned to this part is 2990001436445, and the Federal Supply Class is 2990 Miscellaneous Engine Accessories Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B21-00565.