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What is nominal diameter for coarse threads?
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Design of Machine Elements - 1
Q. What is the approximate nominal diameter for coarse threads?
- Published on 14 Sep 15
a.
d = 1.136 d
c
b.
d = 1.59 d
c
c.
d = 1.19 d
c
d.
d = 0.5 d
c
ANSWER: d = 1.19 d
c
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Discussion
Sravanthi
-Posted on 04 Nov 15
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 connecting parts is needed.
- These threads are designated as 'M' which is followed by nominal diameter. For eg: M30
- The approximate nominal diameter for coarse threads is given as d = 1.19 d
c
, here d
c
is the core diameter. This relation is used if dimensions of these threads are not specified.
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