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nails vs screws
Nails have a smooth shaft and Screws have a threaded shaft.
What kind of force do nails resist best?
Sliding forces (sheer force)
What kind of force do screws resist best?
Pulling forces (holding/withdrawal strength).
Which bolt has a round head and is good for attaching wood to metal or wood to wood?
carriage bolt
Which type of bolt is the best for attaching large pieces of lumber?
lag bolt