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How to distinguish between high-strength bolt nuts and common bolt nuts?

There are generally two ways to distinguish between high-strength bolt nuts and ordinary bolt nuts: one is to hit hardness, and the other is to read warranty. If there is no warranty, it is basically an ordinary bolt nut, and the high-strength bolt nut has a warranty.

The high-strength bolt nut belongs to a standard piece. The characteristics of high-strength bolt nuts are limited to single use and are generally used for permanent connections. Reuse is strictly prohibited. According to the state of force, it is divided into: friction type and pressure type; According to the construction technology, it is divided into: twisted shear high strength bolt and large hexagonal high strength bolt. The mechanical properties and calculation methods of high strength bolt nut and common bolt nut are different. The force of the high-strength bolt nut is first applied to the internal pretension P, and then friction resistance is generated on the contact surface between the connectors to withstand the external load, while the ordinary bolt nut is directly subjected to the external load.

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