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BS 1139-2.1:1991 Metal scaffolding. Couplers. Specification for steel couplers, loose spigots and base-plates for use in working scaffolds and falsework made of steel tubes
standard by BSI Group, 01/31/1991
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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.Cross References: BS 1139:Section 1.1*BS 1139:Section 2.2*BS 2856:Part 3*BS 3436*BS 6001:Part 1*BS 6002 *ISO 272*