Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HX48B4-1 found under Drive Unit Angle by W M Berg Inc. The National Stock Number assigned to this part is 3010011243924, 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 HX48B4-1.