Since their mass production and standardization became possible in the late 18th century, threaded fasteners have played a large role in industry. The strength, versatility, ubiquity, and low cost of threaded fasteners has resulted in their use in everything from structural supports for buildings to the bolts used to mount a motor to its base. While relatively simple in design and construction, selecting the proper fastener can be a very important choice. Many industrial disasters and fatalities have been attributed to a poorly chosen or defective fastener.
"Define the major terms relating to screw threads.
Discuss the various classes of fit.
Describe thread specifications for unified and metric threads.
Explain the various mechanical properties of threaded fasteners.
Discuss the advantages and disadvantages of different fastener materials."
You will not be required to pass the knowledge check questions to move on to the next lesson. These will not be counted as a grade, but each question gives you insight into what you should have learned and the sorts of things you'll need to remember moving forward.
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