Male threaded hex union Surface :Plain Machined and turned SGS audited More than 20 ... special fastener 1,Name: Male threaded hex union;Hex union;Male threaded union2,For the similar union,what can we do ?(1), Ability ... for the material of this kind of union:Grade3.6,4.6,4.8,5.6,6.8 ... hardware fastener ,especially the cutting/turning parts. Male threaded hex union