... joint Surface protect:Oil Machined and turned SGS audited More than 20 years experience in special fastener 1,Name:Steel pipe joint ... ;Pipe joint;Steel joint2,For the similar joint,what can we do ?(1), Ability ... for the material of this kind of joint: Grade3.6,4.6,4.8,5.6,6.8 ... fastener ,especially the cutting/turning parts. Steel pipe joint