Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 506 171 found under Lug Engine by Man Diesel And Turbo Se. The National Stock Number assigned to this part is 2990123813989, 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 506 171.