We were able to start supplying only in October, because the customer has shifted deliveries with respect to what was expected.Anyway, we have already reported the problem when the material arrived, it was already present, the storage time of the plain material not have any effect.As you can see from the sectioned NC sample is clean, there are no residues inside the thread.The thread is not correctly for diameter and geometry of the first 2 pitch.If we measure the thread without cutting the chimney:- with calibrated plug : at the end of chimney = 3.24 – 3.27 OK - at the start of chimney = 3,10 – 3.13 – 3. 18 KO ( Area measured at 2.89 - 2.36 on the cutted part.)On pieces that are at 3.10 - 3.13 the 6H buffer does not screw. ( Plain part)At the moment the customer has stopped deliveries, because he is unable to screw in 20% of the parties.We are doing re-threading tests in-house, with great difficulty and loss of time, currently it costs us more to rework the details respect to purchase.Herefore we invite you to take responsibility for the non-compliance found on the thread.