FULLERKREG® Direct Tension Indicators are a product whose benefits are shared by every stakeholder involved in a structural steel project. From the engineer's office to the inspector on the beam, every party gains measurably from correct, verifiable bolt tension.
🏛️ For Structural Engineers & Designers
Joint design is based on bolt tension — not torque. FULLERKREG® DTIs are the only bolt-tightening method that directly controls and verifies tension, the very parameter that joint design depends on. Engineers can confidently specify DTIs knowing that the installed bolt tension will match design intent.
🏢 For Building Owners & Facility Operators
Every bolt in the structure can be visually verified — not just a sample. FULLERKREG® DTIs allow 100% inspection of bolt tension at every joint without special instruments.
🔩 For Steel Fabricators & Steel Erectors
FULLERKREG® DTIs simplify shop and field bolting operations. No daily torque wrench calibration, no turn-of-nut marking, no proprietary breakaway tools. Multiple major erectors — including Dick Construction, V&M Erectors, Wood Hopkins Erectors, Babcock Wilcox Construction Company, Fluor Daniel Construction, and Bechtel Construction Company — have adopted FULLERKREG® DTIs as their standard method.
🏛️ For General Contractors & Structural Steel Contractors
FULLERKREG® DTIs reduce construction time and eliminate re-work from under- or over-tightened bolts. Visual confirmation is instant — inspectors do not need to physically access every joint with a feeler gage.
⚙️ For Equipment Manufacturers & OEM Suppliers
FULLERKREG® DTIs provide precise, repeatable tension control within ±10% of target preload (GL Certified for M36–M48 wind turbine flange connections). Leading OEMs including Siemens Westinghouse, Boeing, and FMC Jetway have confirmed that FULLERKREG® DTIs meet the precision requirements of their critical bolted connections.
📋 For EPC Contractors & Turnkey Project Managers
FULLERKREG® DTIs allow QA supervisors to verify 100% of structural bolts by visual walkdown. Major EPC firms — including Bechtel, Fluor Daniel, Foster Wheeler (Parsons), Black & Veatch, and Kellogg Brown & Root — have successfully implemented FULLERKREG® DTIs on projects where constructability and schedule reliability are paramount.
🔍 For Inspectors, QA/QC Teams & Certifying Authorities
FULLERKREG® DTIs transform bolt inspection from a sampling exercise into a 100% verification process. Inspectors can identify the tightening status of every bolt from a distance — trace silicone means snug-tight, partial extrusion means approaching preload, full extrusion means correct tension achieved.
Specify FULLERKREG® DTI Squirtern Washers on your next structural steel project: FULLERKREG® ASTM F959 DTI Squirtern Washers.