nut Most nuts look similar from the outside, but in reality, every design is made to solve a specific problem. When many people choose a nut, their first reaction is: “Just find the right size.” But the correct size is only the most basic requirement. If the type is wrong, problems can still occur—unstable fastening, loosening, or even having to redesign the entire structure. If you have ever been unsure which type to use, or only realized after assembly that it was the wrong