Why are screws right handed?We tighten the screws often whenever we find them loose in our appliances or furniture or any other utility item in our household and once we tighten them up, it helps to make the item more sturdy and usable. Have you ever wondered as why we tighten them in a clockwise direction. Even the cap or lid of a bottle, we rotate it in a clockwise direction to close it. The answer lies in the working of our hands. If we observe, using our right hand, we can rotate a screw driver more easily in a clockwise direction than in the anti clockwise direction. Same thing happens when we close the cap of a bottle. That is the main reason why the screws are designed in that way and the thread on the screws are engraved accordingly. Only problem will be that a left handed person might not feel comfortable with this but as most of the people are right handed, the most used and versatile item called screw evolved in that way only.
In some machines due to the technical reasons and requirements sometimes a few left handed screws are also used but that is a rare thing. In such cases most of the screws will be right handed except a few which are intentionally kept left handed. So, if there is such a left handed screw in some machine and someone is trying to open it in the usual way not knowing that it is a specifically fitted left handed screw then he will be actually tightening it more and more!
All the nut-bolts and other big sized screws etc are right handed which are used in various industries for different purposes. The big sized bolts are known as fasteners also.
This is my entry for the month end topic based TOW contest - Right.