... , with various type of Full size,Slim Hole, Over Size, with Big Chamfer ,with Wrench Flat,with ... T coupling,Sub coupling,Full size, Slim hole and Over Size.Main Couplings list Name Size Grade Characters Remarks ... ”; 1”1_1/8”T,Full Size, Slim Hole and Over Size Couplings Sub Coupling 5/8”-3/4”;3 ... alloy AISI 5140,covers Full sizes,Slim hole and Over size ,and has many types like Standard,Sub OD ,with ...