Torque specifications aren’t just random numbers pulled out of thin air. They’re set out by manufacturers to ensure a bolt or stud is stretched enough to safely do its job, and provide the proper clamp load. Bolts stretch when they are put under sufficient tension and that’s how they keep parts together. So when the proper functioning of a piece of equipment that can cost in the tens of thousands of dollars to repair, requires bolts to meet certain specifications, you better be sure you meet those specs.
Do it the easy way
The easiest and fastest way to ensure you’re meeting the outlined torque specifications is to invest in a product like the new RAD Transducer Verification (TV) Series. This pneumatic bolting tool with a built in transducer for torque verification has an instant torque read out and pass or fail LED indicator. With a maximum torque of 3400 ft. lbs, it can handle any job you throw at it.
Know the lube
Most bolting requires lubrication to achieve the proper level of torque. Check the manufacturer specifications to ensure you’re using the right kind of lube, if it is recommended. Lubrication reduces the friction of the bolt head, or nut, while it is turning on the part being tightened. If the tool stops turning the fastener, it may be because of galling of metal, rather than reaching sufficient torque to produce the desired clamp load.
Proven torque verification methods
Three general methods are used for torque verification today.
- The first movement test.
Grab a torque audit wrench like the Stahlwille Torque Audit Wrench after you’ve tightened your fastener. Slowly but firmly apply force in the tightening direction with the audit wrench until you notice the first movement in the fastener. The reading that appears is +/- 3% accurate and is a good indication of the torque applied originally. This is the most trusted measure of torque after tightening.
- The marking test.
After tightening the bolt or nut, mark the surface of the fastener as in a circular pattern and continue that mark to the surface being fastened to. Now loosen the fastener, wait 15 seconds and retighten until the marks you just made align. The torque required to get to that point is a good reference to the original torque used.
- The loosening test.
This is the same as the first movement text except it moves in the opposite direction. The moment in which you feel the first loosening movement will create a good reading on your audit wrench.
Out with the old and in with the new
These three methods of torque verification still take more time than the new RAD TV. Save time and money by investing in this modern solution. To request a demo, contact our expert staff in Ontario or Quebec here.