... 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. ... 8,8.8,9.8,10.9,12.9,etcCarbon steelGr.B,Gr.C,Gr.D,Gr ... (3),Ability for the tolerance Roundess0.002mmCylindricity0.003mmRoughnessRa0.32Straightness0.01/200mm 3,How about the packing details?Plastic bags ...