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Why are stainless steel nuts more slippery than carbon steel nuts?

Update:27-01-2022
Summary:

When we use stainless steel hexagon nuts, we often enco […]

When we use stainless steel hexagon nuts, we often encounter slippery teeth, which makes stainless steel nuts unusable; and carbon steel nuts rarely do this. So what is the reason for this annoying problem?

Under normal circumstances: stainless steel nuts of the same diameter do not have the strength and rigidity of iron. Both carbon steel and stainless steel contain carbon, and the greater the proportion of carbon contained, the higher the hardness and strength of the metal. Carbon content below 3% is carbon steel, and below 1.5% is stainless steel. Obviously, carbon steel has higher hardness and strength than stainless steel. When the screw is screwed into the hex nut, the nut is subjected to torsion. The range of torsional force depends on the strength of the nut itself.

In the production of hexagon nuts, every link is very important:
1. Starting from the strict selection of the original wire of the nut, stainless steel or carbon steel.
2. The size of the wire diameter determines the stability of the quality of the nut. The nut wire of the same specification and type must be selected for the size of the hexagonal nut.
3. The choice of nut machine and the corresponding tap will affect the quality of the nut.

The strength of carbon steel is greater than that of stainless steel. It can be seen that the torsion range of carbon steel hexagon nuts is larger than that of stainless steel. When the torque of the hexagonal nut exceeds the acceptable range, there will be slippage or even breakage. At the same time, the stainless steel nut will be locked at this stage, also known as seized. Since the torsion range of carbon steel nuts is larger than that of stainless steel, under the same torque, if the torque is increased at the same progress, the stainless steel nut will exceed the torsion range faster than the carbon steel nut, that is to say , stainless steel nuts are more prone to slippery teeth than carbon steel nuts.

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