Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HR166-3249 found under Seal Ring Transmisson by Lydall Inc. The National Stock Number assigned to this part is 2520006796974, and the Federal Supply Class is 2520 Vehicular Power Transmission Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HR166-3249.