was looking at these screws on Ebay and I noticed the pictures showed the ends machined but as far as I can discern there is no specs about it. I sent a message to the seller inquiring and this was the reply I got:
"hi,friend.
Thanks for you kindly inquiry,
It is end machining.
Have a sketch map in the item.You can refer..
any question please contact me again.
thank you."
gotta love speaking to someone who doesn't understand English.
For those of you suggesting Linearmotionbearings, from what I have seen, too many people have had to deal with warped screws due to bad packaging. I just have no desire to deal with such a headache.