Load Indicating Washers

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ARE DTIs REALLY WORTH IT?

Could something that costs 10 cents actually guarantee better bolt tension accuracy than your company’s designer?

This question sounds ridiculous to many people since they blindly trust their designer’s torque calculations. Unfortunately, the calculations they rely on to get proper tension may have been determined 10 years earlier by someone that cannot predict all bolt conditions.

In many instances, a designer can only predict some, but not all, of the conditions a bolt may encounter when ...

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There’s a Torque Wrench for That!

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LOOSENING BOLTS: UNDERSTANDING THE NEED FOR A SEPARATE HYDRAULIC TORQUE WRENCH

What’s the harm in using the same torque wrench to make-up and break-out a nut on a bolt? Surprisingly, more than you may realize.

It’s a common misconception that a professional torque wrench can perform both functions equally well. It seems logical that a torque wrench that makes up a nut should also be able to break it out as easily as it made it up. However, this flawed logic doesn’t take certain factors into consideration and often causes productivity and safety to suffer.

The torque required ...

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Flange Spreader Safety Revealed

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By Lisa Raynor-Keck

Lurking on the shelf of your shop is one of the most underestimated safety hazards you’ll encounter. It appears innocent and is often harmless until something goes wrong. Surprisingly, it’s your poorly designed flange spreader.

A flange spreader’s uncomplicated appearance is deceiving. Every year people are treated for injuries when seemingly adequate flange spreaders fail. The results can be anything from cuts and gashes to serious injuries. That’s why having a flange spreader that incorporates strength and safety into ...

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How Tight is Tight?

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By Bill Washington

When answering this question, it is important to understand what happens when we tighten a bolt.  The bolt acts as a heavy spring that clamps two or more pieces together. When we turn a nut we stretch the bolt.  Stretch or elongation provides clamping force. Not enough clamping force allows the nut to vibrate loose causing leaks. Too much clamping force causes gasket damage, bolt ...

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