Table 3 breaks down the load distribution over the first six threads of a carbon-steel
threaded fastener.
Fore aft mentioned 3-D model of finite element has not been used in calculations of
threaded joints up to day.
Threaded glass vials, for example, are used by environmental monitoring firms to contain soil and water samples; pharmaceutical companies are using thread glass containers to deliver drugs into intravenous bags; and computer companies have incorporated tiny fluid-filled
threaded glass containers to cool circuit boards.
The elctrodeposited paints stick to everything, including
threaded fasteners.
Install same size die on pipe stock as size of pipe to be
threaded (Figure 1).
This eliminates not only the sideways motion that causes vibrational loosening, but it also distributes the
threaded joint's load throughout all engaged threads.
Any sideways movement in the conventional
threaded hole reduces locking friction between the thread flanks, and concomitantly, the tension, or load force, in the male fastener generates self-loosening rotational movement.
* Hydraulics are the usual power source driving unscrewing cores to separate
threaded parts from injection tools.
One development, called the Snap-Sert, is a handling device for securing
threaded inserts within a rotational mold that permits rapid installation and demolding of the insert.
"The ability to machine the thread in counter operations allows the end user to manufacture
threaded parts without secondary operations in most cases," says Mark Saalmuller, marketing and communications manager.