integrity of jointing - Security of Operation To meet the demands of outages and shutdowns HYDRA-LOC provides comprehensive bolt tightening and tensioning services to a wide variety of New Zealand industries to identify potential bolting problems. We ensure the maximum integrity of all bolted joint applications. Bolt tensioning is the most cost effective solution in many cases. Services and products: applications for high and low pressure systems in the following industries: · Tensioning · Torque Tightening · Flange Breakout · Ultrasonic Stress Management · Re-Studding · Guarantees available · Power generation · Petrochemical · Pressure vessels and piping · Dairy industry · Mining Marine · Critical structural fabrications