A connecting device comprising a nut and a nut holder made of synthetic resin for holding the nut in a predetermined position in a T- groove made in one side of an elongated standardized member. The nut holder consists of an elastically deformable portion and two projections integrally formed with the opposing ends of the deformable portion. The deformable portion has a width slightly greater than that of the T-groove. The nut is held between the projections of the nut holder, and the nut holder is inserted into the T-groove. Once in the T-groove, the deformable portion of the nut holder remains elastically deformed, thus holding the nut at the predetermined position.
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