Good Day!
Regarding the samples of pan framing screw we send to you, were from the production line which offered to another customer.
We agreed on your samples really did a good performance on drilling is 0.5 sec on averages , but for ours on average is 0.8.
Thanks for your comments, we may can improve better quality on such pan framing screw drilling to be same with yours, but we don’t think it’s a main cause of grey or back phos resulted in.
We found that there is a difference between our samples and yours, after re-study carefully to see the real problem may be.
The TPI of yours is #7-20, which is different from ours #7-16, and we think it may be why it is.
By the way, we found yours with serration under head, is that important on it or NOT, we noticed your don’t specify serration on the order, though it has been confirmed to cancel this item already! But, the most important is on drilling speed.
Now, my boss is preparing for new die of the new screw samples, and it will take around 30 days to run out, we will send you samples again, then
Thanks for your attention on all above, and look forward to hearing your comments soon ~