Ceramic insulator base fitting`s material can be ductile cast iron, malleable cast iron, and low temperature ductile cast iron. And the thread of base for porcelain insulator/ceramic insulator have 3/4``-10, 5/8``-11+. 015`` ect according to client`s drawing.
And the tread will be checked strictly by special gauge. The base for ceramic/porcelain insulator can be one hole, four hole. And will be tipped accroding to client`s requirments.
If you have any needs in the ceramic insulato base fitting, pls contact with us freely. We will make better price for you base on your base drawing.