Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 8AB4 found under Insert Flexible Coupling by Charles Bond Company. The National Stock Number assigned to this part is 3010005280812, 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 8AB4.