Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5900251-4 found under Line Shaft by Tec Design And Manufacturing Inc. The National Stock Number assigned to this part is 4210011894353, and the Federal Supply Class is 4210 Firefighting Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 5900251-4.