Smart bolt, see the color to know whether you have tightened it!
Screw, the simplest traditional thing, feels difficult to have room for innovation. However, a foreign company has invented a smart screw smartbolts, which makes people see whether the screw is loose at a glance.
There is a red dot on the top of the smart screw smartbolts. When it is completely relaxed, the dot is pure red. When tightened with a wrench, the red will darken, and when fully tightened, it will turn black. People can judge whether the screw is loose by color, which greatly ensures safety. For example, accidents in amusement parks due to loose screws can be avoided in advance.
What is the principle? The invention company did not give a detailed explanation, but only a general description. The bolt has a built-in visual indication system, which can make the color change proportional to the tension of the fastener, and the pressure change can change the light transmittance to cause discoloration.
Although there are many advantages to using these bolts, they are not cheap. A 1 / 2 "- 13 x 2.5" Hex Cap screw is about $26. Moreover, the service life is only about 20 years.
But in any case, this kind of screw that can change color is also an innovation to subvert the tradition. It can be known at a glance if the screw is not tightened.