... type of Full size,Slim Hole, Over Size, with Big Chamfer ,with Wrench Flat,with Bidirectional Cambered Surface Protection .And the thread size ... ”;7/8”; 1”11/8”SM It is processed with some special technology, sprayed with a layer of rust-proof, wear-proof and ... ,and has many types like Standard,Sub OD ,with Big Chamfer ,with Wrench Flat,with Bidirectional Cambered surface protection. It has three basic ...