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The material must withstand the test of the force in the application scene, not curved,

The inner surface hardness of the barrel is higher than the screw

1, the screw should be twisted according to the actual diameter of the barrel to consider

1. Look from the appearance: In general, Sweden wear-resistant board for the entire layout has rust-proof layer;

Any material that is subjected to an increasing or constant or continuous change

First, the material under the external force, elastic deformation, followed Hooke's law.

The yield strength is only for elastic materials, the inelastic material has no yield strength.