Screw threads

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Across
  1. 5. where something is going
  2. 6. closing something tightly
  3. 7. changing something slightly
  4. 9. a large amount of something
  5. 13. turning around a central point
  6. 14. screws that move things up and down
  7. 15. coming together as one
  8. 17. an outline of something
  9. 18. using measurements like metres and grams
Down
  1. 1. rough
  2. 2. very good quality
  3. 3. being able to do many different things
  4. 4. how big or small something is
  5. 6. metal objects used to hold things together
  6. 8. sending signals or power from one place to another
  7. 10. a structure that supports a wall
  8. 11. having four equal sides and angles
  9. 12. the highest point of something
  10. 16. joining two things together
  11. 18. movement