The machine screw has been around forever but there are still new designs and models coming out to service an ever discerning market place. The machine screw was developed in the first place as a single bolt and can have a nut fitted onto it if required but the name just emanates from the days when all bolts and screws were called screws. The machine screw has developed over the years as a major fixing for the small and large equipment market. These screws provide a first class fixing for any equipment or machinery where future access may be required to machinery or electronic equipment where it is difficult or impossible to fit a nut or to get a spanner to it to release it. The machine screw can be screwed into plastic or metal or plastic with a metal sleeve that has been tapped with a screw thread. The joint is made by tightening the machine screw into the tapped thread. The problem comes with the force that can be applied on tightening into plastic or soft metals and tightening torque control can be important.
This is the major reason for the ever increasing range of machine bolts as the equipment world demands bolts of different sizes and dimensions and different tightening techniques. The bolt size can be decided by the width of base that is available into which a screw can be fitted. The pressure for smaller products means things are thinner and the screw length available for the machine screw is less. The tightening control then has to be changed by using more screws or fatter screws to roughly keep the total screw thread length the same. The shorter the screw the less screw length available to tighten and the fatter the screw the more thread length is available for tightening. The tightening torque should be decided so that there is no chance of over tightening and pulling out the thread from the socket as this can be disastrous. The size of head must be balanced to the size and type of screwing action required. A large head may be useful but it may require a small screw driving socket to limit the torque onto the head.
The new ranges of machine screws are filling a vacuum that has gradually become more important with far more different lengths and diameters and with different sized heads and tightening procedures and are well worth examining. A good supplier will provide full technical information.
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