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Why do screws have so many heads? What difference does it have?

Mar 28, 2018

First of all, because the contact area between the word, the cross opening and the tool and the inside and outside six angle and the tool contact area is not a level, so the inside and outside six corners will hardly have the problem of screwing the flower (but also has to the inside six twist to round hole). In addition, screw tools must be appropriate, and must be appropriate (if you want to reload it, one-time not discussed), we will be very casual find an inappropriate tool to wring a word and cross screws more than a case (take a stout big screwdriver to screw the back of the laptop computer nails),


But the six corners inside and outside are hard to find unsuitable tools.


Then, a word and a cross screw is not to make you hard to wring, the strength is appropriate on the line, so that big twist on, but later to wring down that person without you so vigorously road and skillful skills, there is a great risk to twist flowers. Finally, the slot will be spent or has been spent, after the twist, please change a new ...


At the same time, rust, please first solve the problem of rust, in addition to rust and twist. "If you want to learn mechanical well, Bolt must draw the skillful", how many mechanical students first is folded on the drawing bolts ... Fold the drawing bolts in the check bolts.

Basic skills should be solid, so that you can spit the other people's drawings, a person finished painting and a little wrong without the picture is very little, learn graphics can be "both offensive and defensive." If you're only talking about "screws" in standard parts, rather than the wider "threaded connectors" or "threaded fasteners", "screws" are common to have a cross and a word, there is a hexagon (in the household appliances less, but cars, bicycles and so on to see).


Non-standard of course it is unrestrained, is to not let you easily disassemble, so must be either the same.


Let's say why there are at least three kinds of words: a word, a cross, and a hexagon. In fact, the word used less and more, carpentry will be more, because it is not too many advantages than the cross, has considered the processing cost of the problem has no difference now, another in the hands of the tool conditions in the next word easier to find alternatives. Now these are not very big problems, many places, or almost all occasions can be replaced by the cross.


The advantage of the cross is that it is not easy to twist the flowers, the inner hexagon is easier to tighten.


To expand a little, the main question may also want to ask is: why "joint" has round, cylindrical and conical? In fact, the main is the application of the decision. The latter two are countersunk head screws, used in the need to sink the head of the place, do not understand the notebook computer in turn to see, are countersunk head, why do you want. Why not use the countersunk head?


Because the sinking of the head to more processing, in the absence of necessary occasions, save money and convenience. Countersunk head screws, used in the need to sink the head of the place, do not understand the notebook computer in turn to look at, are sinking head, why do you want. Why not use the countersunk head?


Because the sinking of the head to more processing (in fact, not necessarily, "special" tool to fix the countersunk head and Hole), in the absence of necessary occasions, save money and convenience.


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