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screws

A screw and a bolt (see Differentiation between bolt and screw below) are similar types of fastener typically made of metal and characterized by a helical ridge, called a male thread (external thread). Screws and bolts are used to fasten materials by the engagement of the screw thread with a similar female thread (internal thread) in the matching part.
Screws are often self-threading (also known as self-tapping) where the thread cuts into the material when the screw is turned, creating an internal thread that helps pull fastened materials together and prevents pull-out. There are many screws for a variety of materials; materials commonly fastened by screws include wood, sheet metal, and plastic.

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  1. J

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  2. P

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  3. B

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  4. M

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  5. M

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  6. Z

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  7. A

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  8. A

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  9. B

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  10. H

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  11. M

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  12. J

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  13. W

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  14. M

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  15. B

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  16. J

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  17. P

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  18. D

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  19. V

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    • vanillaspice
    • Thread
    • close fixing forward oil problem screws tighten toilet toilet seat
    • Replies: 6
    • Forum: Plumbing Jobs | The Job-board
  20. P

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