T-Type Nut

For the circulation of this type,the steel balls roll forward along the grooves between the screws and the nut,then are picked up at the front end of the external circulation tube,which further pass through the circulation tube and circle around to the other end of the circulation tube,finally return to the origin point(as per Fig.3.23).
It is generally provided with several rolls of steel balls and a single pass circulation tube,both round type and projecting tube type of profile may be adopted.

I-Type Nut

In this type,the steel balls move along the grooves of the internal circulator,diagonally pass over the tooth tops of the screws,then return to the origin point.it generally possesses one roll of steel balls and one single pass circulation (as per Diagram 3.24)
This type of screws has at least one end with completely through threading,sultable for screws of smaller diameters,it is equipped with metal circrlator.

K-Type Nut

It applies the similar circulation as that of I-type,but circulation takes place in key slots lf identical angle for different circulation (as per Fig.3.25)

E-Type Nut

This type has the features of both the external circulation type and the internal circulation type;the steel balls roll forward in the grooves between the screw and the nut,and are further guided by the end cap circulator at the nut end to the circulating hole in the nut body.It is generally similar to the external circulation type featuring multipe rolls of steel balls and single pass of circulation,but is not provided with external tubes (as per Fig.3.26).