7 Key Features of FULLERKREG® Direct Tension Indicators That Make Structural Bolting Simpler and Safer
Easier & Superior to Turn-of-Nut and Calibrated Wrench Methods
No need to mark or remember to stop tightening at 1/3, 1/2, or 2/3 turns. No need for daily or per-batch bolt condition and torque wrench verification or recalibration.
Superior to Torque Control Bolts
Direct tension control, not torque control. No special proprietary tightening tools required. No broken-off ends that become potential jobsite safety hazards and sources of bolt corrosion. No issues with the tail end breaking off due to torque before the steel components are joined.
Suitable for High-Strength Bolts of Any Length; Bolt Quality Inspection
Even for extremely short or long bolts, FULLERKREG® Direct Tension Indicators activate accurately when the tension value is reached. Derived inspection function — to examine bolt performance when pre-tension locking quality cannot be reached repeatedly or when there are doubts about bolt sourcing.
Prevents Excessive Torque, Accurately Controls Bolt Tightening
The installer knows exactly when to stop tightening. Some applications require bolts to be slightly tighter without over-tightening. FULLERKREG® Direct Tension Indicators achieve effective, accurate control that was previously impossible.
Achieves Optimal Snug-Tight Conditions
The orange silicone compound appears in trace amounts, small amounts, or full amounts (design preload), allowing bolt tightening status to be known and controlled. This facilitates completing correct tension on every bolt in sequence, achieving the most uniform and optimal bolt snug-tight condition and consistency across all bolt groups for the best steel assembly quality.
Simple Visual Direct Tension Indicator; Saves Construction Time
The orange silicone compound is easily identified visually. No other inspection tools are needed during installation; both novice and experienced installers can easily master it. Visual confirmation of locking tension shortens identification time and increases tool relocation speed, saving installation labor hours.
Safer for Inspectors
Inspectors (quality control checkers) can easily see the amount of orange silicone compound extruded from a distance to identify bolt tightening status. They do not need to carry inspection tools and climb up and down steel structures to personally inspect bolts at every joint, nor rely solely on initial feeler gage sampling of a few bolts. In fact, the adoption of FULLERKREG® Direct Tension Indicators allows every single bolt to be inspected.
View the complete FULLERKREG® DTI product range: FULLERKREG® ASTM F959 DTI Squirtern Washers.