Permanent Traceability

Lot number for lot sizes up to 250,000 pieces allow for permanent traceability of installed parts to all original manufacturing and test data.


Indents assist in fast & easy inspection.

Patented Protrusion Pockets

Patented protrusion pockets assure consistency regardless of surface condition.
Friction Free Push BackTM

Reverse side of DTI

TurnaSure Trademark

The TurnaSure trademark is the symbol of the most accurate system on the market (±1% accuracy).

Curved Protrusions

New curved protrusions for superior fit under bolt heads and perfected reliability. Now eliminates hardened washers when tightened under turned element.

ASTM Grade Marking

Indicates proper grade of bolt the DTI must be paired with.

The TurnaSure DTI Direct Tension Indicator Click on the targets to explore
the benefits of TurnaSure DTIs
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 »


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