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Nuts & Bolts; Tips for Overcoming Failure in Bolts
Got a difficult bolted
joint? We recently helped a marginal joint who's bolts just weren't living,
simply by going outside the torque tables. Most bolting applications use
standard tables to define bolt torques, and these tables generally try to
bring bolts up to 3/4 of proof load (slightly less than yield). Because a
torque wrench's gage won't read any higher once a bolt yields, it is necessary
to stay well below yield when using this torquing technique. But remember
that a bolt lives because it's preload is so far above the fluctuating applied
load that it seems static. We applied some tricky math, and used the
turn-of-the-nut torquing method to bring these bolts up above yield, making
the applied load insignificant from a stress point of view, and allowing them
to live in a difficult environment.
If you are having issues with bolts not holding or any other engineering concern, don't hesitate to
get in touch. We are always happy to help
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