The bolt head of the Smartbolt induction bolt has an induction disc, and the tighter you screw it, the darker it is. When your strength is used to the maximum, its "face" is black, as if shouting: "Don't screw it, I hurt!", without any electronic device, it is completely visual. It also has a more accurate version: when the intensity reaches 90%, it turns from yellow to green, and after 100%, it is black.
As for the principle, after reading the cross-section below, you will understand
Creative reproduction: bolts without nuts
The news about the transformation of hand tools, we can hear at least 1 or 2 times a year, for example, the American hand tool professional brand Craftsman has recently introduced the pliers with LED lights. However, the news of the transformation of fasteners is relatively rare; the most recent one occurred in 2008, the main fastener manufacturer and supplier of Canada, GRK, launched W-Cut, a new screw that does not require the use of drill bits. Recently, fasteners have been reinvigorated, and Japanese auto parts supplier Lock'n Bolt has introduced bolts without nuts.
Lock'n Bolt's product is quite elaborate. This product will be specially used in the industrial and commercial field to prevent the continuous vibration from loosening the structure of the original nut bolt. There are two cracks on the inner side of the inner end of the bolt. A small piece of metal is placed in the crack. When the bolt is drilled, the small piece of metal will touch the bottom first, and the bolt end will start to push away from the bolt itself. The entire bolt can be fully drilled.
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