Abstract: A clamp-on ultrasonic meter includes a housing with first and second portions which define an aperture for receiving a pipe, which include an ultrasonic transmitter and receiver that engage the pipe. The first and second portions are hingedly connected and clamped to one another around the pipe using an overcenter latch mechanism that incorporates a hinge with first and second ends each comprising a bearing, with the bearing in the first end of the hinge coupled to an axle on the housing and the bearing in the second end coupled to an axle on the latch. The latch couples to and engages a hook on the second housing portion, engaging the pipe within the aperture in compression pressure produced by the latch.