A fixed-angle centrifuge rotor fabricated from fiber-reinforced composite material including a composite rotor plate, composite tube holders, and a hub to attach the rotor plate to a centrifuge. The rotor plate has counterbored through holes with each counterbore defining an annular step. The tube holders are cylindrical in shape and are mounted to the rotor plate in each of the counterbored through holes. Each tube holder has an circumferential flange that mates with and is bonded to the annular step in a counterbore of the rotor plate.
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