Turnasure Direct Tension Indicators provide the most cost effective solution to achieving the correct tensions on high-strength bolts, studs and anchor bolts. They have grown in use worldwide on major projects and other bolting applications since our legacy company invented them in 1962. They are manufactured to several ASTM Standards and in the European Union to EN 14399-9. TurnaSure is the world's leading manufacturer of these fasteners. (less)