Abstract: A T nut having a tubular body with an inner thread and a flange with upright retaining teeth around one end of the tubular body is disclosed. The tubular body of the T nut has a first section connected to the flange and a second section axially extended from one end of the first section remote from the flange, which second section having a plurality of longitudinal splits that separate the periphery of the second section into multiple curve surfaces that will curve radially outwards to engage the workpiece after installation of the T nut in the workpiece and threading of a screw into the inner thread of the tubular body.

Abstract: A bund nut includes a duct having a latch section formed on the peripheral surface and a flange extending from the periphery. The duct has a first area and a second area joining at a juncture to form an annular ring. The annular ring has a ring surface inclined from the wall of the second area to the wall of the first area. During the bund nut is undergoing riveted process coupling objects, the pulling force concentrates on the peripheral surface of the duct. Thus applying a minimum force can bend the duct quickly to enable the flange and the bending section of the duct to tightly clamp and couple the objects.