The co-cured joint is an efficient joining technique because both curing and joining for composite structures are achieved simultaneously. In this paper, the torque capacities of the co-cured tubular lap joint with and without knurling of the pyramid type were experimentally measured. From the experiment, it was found that the excess resin of composite prepreg should not be extracted much because the excess resin played a role as an adhesive in the co-cured tubular lap joint whose steel adherends were not knurled. Also, it was found that the torque capacity of the co-cured joint was increased as the knurling size of the pyramid type on the surface of the steel adherend was increased.
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