As a convenient means of joining long metal rods at right angles, special three-coil triplenuts (TN parts) have been produced. The axes of two of the three coils make an angle of about 15 degrees while the third lies between the other two, off to one side, and has its axis perpendicular to the plane containing the other two. To use triplenuts, a rod is first passed through the shorter third coil, then a second rod is passed through the two longer coils (15 degree angle). Pulling the two longer coils into line locks the second rod by friction, and simultaneously reduces the turns diameter on the third coil. This reduction locks the first rod. Ceramic rods may also be locked together using the triple nuts.
Mo-TN-C (5 parts/standard package
See Drawing at left.