1.Hawaii is rather south than other parts of the United States.(from a test paper)
That's probably a typo error. Further south than?
You always use the comparative(bigger, better, further) with 'than'.
2.The screw located for end stop going right.Is it a correct sentence?
The sentence does not make any sense. You normally say 'located at', not 'located for'. Where did you get this from?
not a teacher
Student or Learner