BSI BS 1139-2.1
BS BS 1139-21 1991-JAN-31 Metal Scaffoldng Part 2 Couplers Secton 21 Specfcaton for Steel Couplers Loose Spgots and BasePlates for Use n Workng Scaffolds and Falsework Made of Steel Tubes-CORR 10294 October 15 1998
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Requirements for materials and design and test procedures for couplers, loose spigots and base plates used for connecting steel tubes of 48.3 mm outside diameter and of at least 3.2 mm nominal wall thickness.