Screw hreads are helical in dorm and helical ridges are formed by cutting or rollig a grooves into the surface of cylindical bar, are called ecternal threads and threads ct in a hole are called internal threads.
The scres are also used for power transmssion such as lead screws of Lathe machine, Milling machine and fly presses etc.
TYPES OF SCREWS
1: Cap screws
2: Machine screws
3: Set screws
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