At present, most of the screws are all Yongnian County produced from Hebei. Every county in all counties all in the country has a standard parts, and the standard screws include bolts, screws, studs, nuts, machine screws, self-tapping screws, gaskets. Ten categories: pin, rivet, and ring. It is a basic part widely used in various aspects, and its function is a joint fastening role. The coupling form can be divided into detachable coupling (using threaded fasteners such as bolts, nuts) and sex coupling (using rivets).


How to distinguish between stainless steel screws, galvanized and nickel-plated screws from appearance?

Firstly by: Stainless steel is the primary color of the iron, the galvanized screw is white, colored, black, and nickel-plated screws are silver.

1. Stainless steel screws are stainless steel, and the color of stainless steel is mainly iron and carbon alloy, so color is close to iron color;

2, the surface galvanizing of galvanized screws has white zinc, color zinc, black zinc, etc., so the color of the galvanized screw is generally white, colored, black;

3, the color and nickel plating of nickel plated screws, generally presented very bright silver.





Other methods of distinguishing stainless steel screws, galvanized and nickel-plated screws:
1. Differentiation with magnets: stainless steel generally does not have magnetic properties, cannot be adsorbed by the magnet, is the stainless steel screw, galvanized and nickel-plated screws can be adsorbed by the magnet.

2, distinguishable by oxidant: metal nickel has strong passivation capability, when electroplating can quickly generate a thin layer of passivation, so the surface of the nickel plated screw has a layer of passivation film, galvanizing surface is a layer Zinc, there is no thing on the surface of the stainless steel, and can be distinguished with a strong oxidant.

3, distinguishable with strong acids: stainless steel and nickel, there is a strong anti-corrosion resistance, no strong acid, nickel-plated screw surface has a layer of passivation film, slowly, galvanized screw Corrosion is fast.

Summary: From the appearance of the stainless steel screw, galvanized and nickel-plated screws is to see the color of the screw, the color of the stainless steel screw is close to the primary color of the iron, the galvanized screw is white, colored, black, and nickel-plated screws are very bright. In addition to this, the stainless steel screw, galvanized and nickel-plated screws can be distinguished by magnet, oxidant and strong alkaline.