Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number T561-0329-001 found under Ring Piston by John Crane Inc. The National Stock Number assigned to this part is 2990012344823, 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 T561-0329-001.