Dimensions of ball and socket for the special type are in accordance with dimension of ball and socket coupling of string insulator units IEC-120 and dimension of hanging insulator units for high voltage transminssion lineGB 4056-83
F-square J-strengthen,grading ring T-Adjustmentable.
L-yoke plate,tension rod,rhomb Z-90
The closed-pin stainless is steel work,the other parts are hot-dip galvanized steel.