How to distinguish the difference between steel, titanium, zinc and aluminium screws?
No special requirements, no higher corrosion requirements, usually surface oxidation treatment or electro galvanized treatment, surface oxidation treatment will make the outside of the black surface of the screw, which is very good identification.
As for the titanium screw thread, mainly used for aerospace vehicles such as connection, everyday is rare, don't bother to tell you, if in a similar institute or company of course may encounter, the price and quality requirements are high, there must be a list of purchase, check can, of course, the weight is lighter.
In general, no separate with metallic zinc as threaded parts of the material, the thickness of zinc if needed a little, can be galvanized or zinc thermal spraying, this kind of situation, the weight and the ordinary steel screw component can determine roughly the same weight. The aluminum screws are light in weight and light in appearance.
Electro galvanized treatment of threaded parts, the surface is not particularly bright bright white, galvanized color zinc will have color lines, but also very good distinction.
Commonly used bolt (screw) material according to bolt performance level, usually used for carbon steel, low carbon alloy steel, medium carbon steel and alloy steel. There may be different materials for heat treatment.
