... have several kinds of scaffolding couplers, includes German type, American type, Australian Type, Japanese type, Korean type, British type, and so on. All the produces in ... join two scaffolding tubes having outside diameter of 48.3mm at right angles. 2.tightening nuts suit standard scaffold spanner 3 ... 1.joins scaffold tube having outside diameter of 48.3mm at any angle. 2.each half of the coupler is ...