... couplers are widely used with Ø48.3 steel scaffold tubes, we also produce a few number of ... special size couplers to suite with different diameter scaffold tubes, such as 34, 38, 60, 63 ... at right angles. 2.tightening nuts suit standard scaffold spanner 3.replaceable "t" bolts,nuts and washers ... tension or compression loads. Swivel coupler 1.joins scaffold tube having outside diameter of 48.3mm at ...