Classification of wire thread insert and thread insert

Thread insert is a new type of threaded fastener, which can meet the international standard of high precision internal thread after loading into the product, and its performance is better than the thread formed by direct tapping. Thread braces are divided into ordinary thread braces and lock thread braces according to the use function, and can be divided into stainless steel thread braces and copper alloy thread braces from the material.

(1) Classified according to the function of thread insert

A, common thread Inserts (Free-Running Inserts) marked "FR"

B, Screw Lock Inserts marked "SL"

(2) Classified according to thread insert material

A, Cr-Ni stainless steel material: through the combination of strength and material, it is usually used in light micro-structure, aluminum alloy structure, seawater, chlorine-containing liquid, and increased corrosion resistance.

B, Copper alloy material: in the case of requiring copper or often adjust the rotation of the threaded connection used; Use when required in situations such as conducting electricity or self-lubricating.

C, Superalloy material: temperature at 500-750 ℃ heat resistant use; It is used for aerospace assembly technology, aircraft engines and internal combustion engine turbine compressors operating at 750 ° C.

(3) According to the thread system of the thread insert classification

A, international standard ISO "M, MJ" series thread insert thread series mark "M", "MJ"; Spark plug Thread (Spark plug Thread) wire insert in this series

B, UNIFIED Thread "UN" Series thread braces (UNIFIED Thread Series)

Coarse thread marked "UNC", fine thread marked "UNF", ultra-fine thread marked "UNEF"

C, non-thread sealed Pipe Thread (British Standard Pipe Thread) thread mark number is "G"

(4) Classified according to the direction of rotation of the thread insert

A, right-hand thread insert

B, left-hand thread insert

(5) According to the thread insert mounting handle classification:

A, with mounting handle thread insert B, without mounting handle thread insert

(6) According to the surface of the thread insert coating is classified

A, no surface coating thread insert (thread insert)

B, the surface of the plated thread insert such as: silver, cadmium plating, etc.