All hydraulic “no-tack” line-up clamps are precision fitted to the proper specifications to ensure proper alignment and quick clamping. All hydraulic clamps have an arched cross bar design and a hydraulic jack with hand lever for quick line-up of the pipe. All “No-Tack” clamps have an arched cross bar design to allow 360º continuous welding without clamp removal, eliminating “tack” welds. The hydraulic line-up clamps are quick and easy to use, and have the extra power of hydraulics to maintain tight alignment of the pipe.