Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HU53A4R found under by High Precision Incorporated. The National Stock Number assigned to this part is 3010009384171, and the Federal Supply Class is 3010 Torque Converters And Speed Changers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HU53A4R.