Coarse threads & fine threads

Q.  Which of the following threads have greater pitch and lead angle for a given nominal diameter when compared with each other?
- Published on 14 Sep 15

a. Coarse threads
b. Fine threads
c. Both a. and b.
d. None of the above

ANSWER: Coarse threads
 

    Discussion

  • Sravanthi   -Posted on 04 Nov 15
    - Coarse threads have greater pitch and lead angle for a given nominal diameter when compared with each other.

    Coarse threads:

    - Coarse threads are stronger than fine threads. These threads offer less resistance and have less possibility of thread shearing and crushing.
    - Coarse threads apply less resistance during loosening or unscrewing. So these threads can be used where frequent assembly or disassembly of connected parts is needed.
    - These threads are designated as 'M' which is followed by nominal diameter. For eg: M30

    Fine threads:

    - Fine threaded bolts are more stronger than coarse threaded bolts of same hardness because these bolts have large diameter and tensile stress area.
    - The screw body is stronger even though threads weaker.
    - These threads offer more resistance while unscrewing.
    - These threads are designated as 'M' which is followed by pitch and nominal diameter.

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