One screw does not open. This is probably a scenario that many craftsmen and home improvement know. Here are some tips and tricks on how to unscrew a screw that can not get out.
Preparations when a screw does not go out
This is often the case with metal screws in particular: they try to unscrew a screw, but it sits securely in place. You now have several options for helping to make sure the screw opens:
- with targeted hammer blows
- with rust remover and / or penetrating oil
- with heat and possibly cold
basically for loosening screws
Never use open-end wrenches with hexagon bolts. These destroy the screw head and make it round. Preferably always use high quality nuts and ring spanners!
Remove screw with rust remover
Rust remover should be part of the basic equipment of your tool and auxiliary equipment, although metal screws are important in your work. However, we strongly recommend to use a really high quality rust remover, so only branded products. In cheap products, the composition is often inferior and the rust is not solved.
Using Rust Remover
Preferably spray the screws or bolts you want to loosen vigorously with Rust Remover the day before and several times. Spray really generously so that the screw or bolt literally "floats" in the rust remover. This ensures that enough rust remover can run over the thread between the workpiece and the screw.
Loosen the screw with sensitive hammer strokes
This method is ideal for combining with the rust remover. Slap the head of the screw a few times with a suitable hammer. For some screws and bolts (for example, lug nuts or wheel bolts and other screws), it is advisable to set a nut before, in order not to damage the screw head and any protruding thread of the bolt. Never hit too hard, but not too timid. The strokes should always match the screw size.
Loosen the screw with heat and possibly cold
A particularly efficient technique for loosening screws and nuts is heating. Unfortunately this can not be done with every screw or nut. On wheels, you must not do that, and then not if plastic parts could melt. In addition, you must remember that you practically sinter the screw or nut by heating. That is, the metal structure becomes porous and brittle. Heavily heated screws (which have been annealed) should not be reused in any case.
Heating the screw or bolt
The usual procedure is to heat the screw or nut. Then install the wrench very quickly and start turning. You may also need to extend a tap wrench (or reversible iron) with nut or a wrench. With a glowing mother or screw, the chances are very good that they can be solved with relatively much strength, but nevertheless.
Combination of heat and cold
You can also heat the environment, ie the workpiece. Then quickly spray the screw yourself with a cold spray. But of course there is a risk of cracking certain components here. This technique can only be used in a few cases. Usually, however, helps heating the screw without cold spray. Incidentally, it is useful in this case, in addition to solve the screw or nut with hammer blows.Tips & TricksIf the screw is turned round or even torn off, only techniques that are considerably more time-consuming can be used. Here you will find detailed instructions for a screw extractor.