The world’s most popular bolting technology and DTI

Simplest solution for properly tensioning bolts

TurnaSure manufactures simple washer type load cells known as a Direct Tension Indicator or a Load Indicating Washer. TurnaSure's legacy company invented this brilliant concept of bolting technology. When this washer device is compressed while tightening a bolt or stud, the required clamp load is indicated in the fasteners and induced in the bolted joints. TurnaSure was the world's first company to devote all its energies to developing and supplying this unique fastener.

Most comprehensive product line of bolting technology

TurnaSure manufactures the world's largest variety of Direct Tension Indicator Washers (DTIs). These are used for achieving required tension loads on bolts in countless applications. These include Structural Steel Buildings and Bridges as well as DTI Washers for Studs used in the Petro-Chemical Industry, Anchor Bolts, and SAE Cap Screws for Automotive applications. TurnaSure also supplies special Direct Tension Indicators to customer's individual specifications in a variety of materials including Stainless Steel.

More about the TurnaSure DTIs »


TurnaSure DTIs are currently manufactured to the following standards:

  • ASTM F959 and F959M for use on inch or metric A325 or A490 ASTM (American Standard Structural Fasteners).
  • CEN Standard EN 14399-9 (replacing BS 7644) for use on CEN Standard Structural Fasteners in the European Union.
  • ASTM F 2437-06 for Carbon Steel Compressible-Washer-Type Direct Tension Indicators for use with Cap Screws, Bolts, Anchors, and Studs.
  • TurnaSure’s DTIs are also manufactured for use on DIN 6914 10.9 structural bolts and Japanese Standard JISB 1186-F10T High Strength Structural Bolts.
Full List of Grades, Sizes and Specifications of TurnaSure DTIs »

Bolting technology Projects
Featured Bolting Projects Using Direct Tension Indicators The Shard in London: Built Using TurnaSure Direct Tension Indicators DTIs

Europe's tallest building

TurnaSure CEN DTIs have been used on the entire project.
 

DTI’s are recognized by the following international bodies:
TurnaSure Bolting technology