[±45] graphite fiber/epoxy resin composites were fabricated to form double lap bolted joints, each containing three bolts abreast at constant pitch distance. The specimens were tested to measure the joint strenghtening effectiveness of colaminated boron/polyimide film, introduced locally at 6 or 12 volume percent levels. Such film additions increased the load transfer capacity of the joint systems to nearly double that of the corresponding fiber-only specimens. This behavior, in qualitative and quantitative agreement with the earlier experiments on single-bolted lug configurations, indicated that boron film can contribute significant tensile, bearing, and shear strength to this type of multifastened joint design. The resulting stiffness increase did not prevent the uniform distribution of the load among the several fasteners in these experiments.