Abstract: A clamp assembly which together with a single nut can be used to form a secure lap-joint between overlapped ends of telescoped pipes, includes a yoke having a rigid body defining a concave semicircular pipe-engaging edge, and an elongate member having an arcuate central portion and a pair of parallel legs which extend integrally and tangentially from the arcuate central portion, with one of the legs being pivotally secured to the yoke. A free end of the other leg is threaded for engagement with a nut. The yoke includes a bearing seat upon which the nut can be tightened onto the threaded end of the elongate member to urge the concave semicircular pipe-engaging edge of the web and the concave semicircular pipe-engaging perimeter surface of the elongate member together to apply radially compressive forces about the circumference of overlapped ends of telescoped pipes.