The ring nut is a part that closely connects 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 treated, but according to requirements, can be galvanized passivation, chrome plating and other surface treatments, 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.

Carbon steel is a common metal material with the following advantages:

• High strength: Carbon steel has excellent strength characteristics and can withstand large external forces and pressures.
• Good wear resistance: Carbon steel has high wear resistance and can resist wear and scratches.
• Strong plasticity: Carbon steel is easy to process and form through cold working, hot working and forging processes.
• Price economy: Compared with other metal materials, the production cost of carbon steel is relatively low.