Black M8 M12 Carbon steel eye nuts Class8. 8 Grade 8.8 eye nut square neck

Black M8 M12 Carbon steel eye nuts Class8. 8 Grade 8.8 eye nut square neck
 
 

 
 

Product Description:
The ring nut is a part that closely connects the mechanical equipment. Through the inner thread, the ring nut and screw of the same specification can be connected together. The ring nut is often used in conjunction with the external thread column to lift various equipment, such as molds, chassis, motors, etc.

The ring screw is generally not surface treatment, but according to the requirements, can be galvanized passivation, chrome plating and other surface treatment, and according to GB5267-85 provisions.
After electrogalvanizing, the chemical composition and mechanical properties of the material should be tested in accordance with GB699. During routine inspection, the grain size test may not be advanced, and the grain size test method shall be prescribed by YB27. Thread inspection is carried out with thread gauges and smooth limit gauges or universal gauges.

The ring should be scrapped when visible deformation occurs.

When lifting, accompanied by an increase in acceleration or impact, you must choose a smaller load than the table above.

When lifting at 45°, measures such as sinking holes should be added to make the supporting surface of the bolt or nut closely stick with the mating part. Secondly, an appropriate washer is added so that the direction of the two rings is in the same plane. The error (deflection) of this combination should be within 5 degrees from the plane containing the axis.

For the purpose of increasing mechanical properties, when special steel and other materials are used and heat treated, the ductility becomes smaller, and it is easy to break before overloading and ring deformation, which is dangerous.

Applications

What is blackening
Various steel products in contact with the air for a long time, will naturally form a layer of oxide film on the surface, but this layer of film is not very complete and dense, so it is easy to cause the steel from the surface to be oxidized and corroded.
Blackening is the use of a variety of chemical substances, produce a chemical reaction on the surface of the metal, so that its surface is attached to a layer of black oxide film.
The purpose of blackening treatment is to make the metal parts not subject to oxidation, so as to make the metal parts completely isolated from the air, improve the rust prevention ability, after blackening treatment, it can also increase the surface luster of the metal parts to make it more beautiful, and can also reduce some internal or external deformation caused by the workpiece.

 
Galvanising is a surface treatment technique of plating a layer of zinc on the surface of metals, alloys or other materials to provide a beautiful and rust-resistant appearance. The colour of zinc after galvanising is silver-white, and the colour after passivation of galvanising can be white, coloured, army green, etc.

 
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