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TurnaSure Sets the Bolting Technology Standard for Properly Tensioned Bolted Connections

World's simplest solution to properly tension control bolts

TurnaSure manufactures simple washer-type load cells known as Direct Tension Indicators or Load Indicating Washers. TurnaSure's legacy company invented this brilliant concept of bolting technology. When these washer devices are compressed following tightening of bolts or studs, 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. Why are properly tightened bolts often critical?

Details of the TurnaSure DTI
Details of the TurnaSure DTI

World's most comprehensive product line of bolting technology

TurnaSure manufactures the world's largest variety of Direct Tension Indicator Washers (DTIs). Our DTIs 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, on Anchor Bolts, and SAE Cap Screws for Off-Highway, Specialty Vehicle, and Class 8 Automotive applications. TurnaSure also supplies special Direct Tension Indicators to customer's individual specifications in a variety of materials including nonferrous or stainless steels.

The most precise and reliable bolting technology product design

TurnaSure produces the most precise Direct Tension Indicators available, assuring accurate clamping loads on bolts and studs. In fact, we've been setting the standard, and developing and improving our patented unique bolting technology product designs for load-indicator washer technology since their introduction more than half a century ago!

Unique Patented Design of Direct Tension Indicators

The unique designs of our patented Direct Tension Indicators significantly improve field tensioning accuracy. TurnaSure Direct Tension Indicators retain their accuracy regardless of their surface condition during tightening, be they oiled, coated or even rusted. Learn more about our patents here.

TurnaSure DTI

TurnaSure DTIs are manufactured under numerous world-wide pending patent applications and one or more of the following granted patents: United States Patents No. 9,863,457, No. 7,635,243, No. 5,667,346, No. 5,487,632, and No. 5,370,483; Canada Patent No. 2,244,415; United Kingdom Patents No. 0528912, No. 2279421, and No. 0874955; German Patent No. 69707641; France Patent No. 0874955; Italy Patent No. 0874955; Australia Patent No. 707497; India Patent No. 191732; and South Africa Patent No. 97/0936.

How does a Direct Tension Indicator (DTI) work? Direct Tension Indicators work by compressing in a very predictable rate in reaction to generation of axial tensile force in a bolt or stud. The compression (‘flattening’) of the protrusions on a DTI has no effect on the torque necessary to tighten fasteners. DTIs are ignorant of the torque needed to tighten bolting assemblies, yet expert on reporting the resulting tension.

Final inspection is simple, quick, and easy. A visual inspection to determine the Direct Tension Indicators (DTIs) are sufficiently flat is all that is needed, And ViewTite® self-indicating DTIs go a step further – providing a visually obvious neon green indication of proper tensioning.

Advantage's of our patented Direct Tension Indicators:

  • Provide absolute assurance that bolts, anchors, and studs and properly tensioned
  • Improves structural rigidity
  • Verify compatibility and capability of all of the components which make up each fastener assembly
  • Reduce inspection costs and effort, while making inspection safer for installers, special inspectors or quality assurance staff,

Contact TurnaSure today for more information, availability and quotes.