Historical
BS ISO 9649:2016
Metallic materials. Wire. Reverse torsion test (British Standard)
ISO 9649:2016 specifies a method for determining the ability of metallic wire of diameter dimension from 0,3 mm to 10,0 mm inclusive to undergo plastic deformation during reverse torsion. This test is used to detect surface defects, as well as to assess ductility.
British Standards Institution [bsi]