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Torque Wrench Prevents Over-Torque Conditions

Posted by Mountz Torque December 21st, 2011 0 Comments   
TSN is a preset cam-over torque wrench that’s ideal for maintenance and production applications where over-torque conditions are not tolerated. The use of cam-over wrenches takes the operator influence out of the torque equation and offers more accurate and repeatable results than a standard ‘click’ type wrench.

The Mountz TSN cam-over torque wrenches utilizes a ball and lobe design that allows the tool to slip free once the preset torque is reached. Even if the application of force is repeated, the preset torque value wont be exceeded, eliminating the possibility of over-torque.

A torque tester is a finely tuned instrument designed for testing and monitoring torque wrenches. Using a quality torque wrench calibration system is important for many companies to ensure that proper torque is being applied and maintained for their quality requirements.

Topics: Apply
 

The Facts About Stainless Steel

Posted by Mountz Torque December 14th, 2011 0 Comments   
mr.metric stainless steel

You’ve probably heard a lot about stainless steel this and that. But what’s the big deal about stainless steel — and when do you need to choose stainless steel fasteners for your project?

First let’s examine what goes into stainless steel that makes it, well, stainless. Ordinary carbon steel met the world’s steel needs for centuries, finding its way into everything from building projects to swords, but it was by no means a perfect metal. Before you could say “Taste my steel!” the exposure of the steel’s surface to oxygen would lead to oxidation, which would show itself in the form of iron oxide — in short, it would rust. The more corrosive your environment, the faster oxidation would take place. If you lived by the seaside, forget about it.

Stainless steel solves that problem by containing at least 11 percent chromium. When this metal is mixed into the steel, it oxidizes too — but it oxidizes into a super-strong, corrosion-resistant film of chromium oxide. This outer layer of chromium oxide acts as a kind of protective sealant that prevents rust from penetrating the steel.

Stainless steel fasteners are an industry standard for other reasons as well. These screws maintain their strength under extreme temperatures (hot or cold), they’re easy to clean, and their anti-corrosive qualities give them a longer lifespan than fasteners made of other metals. Stainless steel is largely resistant to magnetic forces as well. And of course they look great — after all, they’re stainless!

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Topics: Fasteners
 

Ensure Screws are Correctly Tightened in the Correct Sequence

Posted by Mountz Torque December 7th, 2011 0 Comments   
Sequence Arm Story

Many joints consist of more than one fastener and bringing together surfaces that are not completely flat can be a very challenging torque problem. The sequence of tightening fasteners can have a major influence on the resulting preload and clamping force, which is what holds two parts together. With such joints, consideration should be given to specifying the sequence in which the fasteners are to be tightened. Because the joint surfaces compress, tightening one fastener in the vicinity of another will affect the preload generated by the first fastener tightened. This is called Cross Talk.

A good tightening sequence ensures that an even preload distribution is achieved in the joint. Since joints containing conventional gaskets have a comparatively low compressive stiffness, bolt preloads in such joints are particularly sensitive to the tightening sequence. Based on experience, if the bolts are in a circular pattern, a cris-cross (star) tightening pattern would normally be specified. For non-circular bolt patterns, a spiral pattern starting at the middle would normally be specified. On critical joints or joints that exhibit relaxation, a tightening pattern that tightens the fasteners more than once can be specified to ensure an even preload distribution.

Sequence based fastening is critical to proper process control and a quality fastening result for many applications. If an assembly exhibits cross talk, a phenomenon where torque to one fastener changes the result to another in the in fastening pattern, altering the sequence is often necessary to achieve proper results. Position Control torque arms are designed to reduce the risk of improperly fastened screws, ensuring that every screw is in the correctly tightened in the correct sequence. An encoded torque arm is perfect because it guides the operators sequence and provides feedback if done incorrectly.

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