A bolt of M 24 × 2 means that: 

This question was previously asked in
ISRO VSSC Technical Assistant Mechanical 7 April 2012 Official Paper
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  1. 2 means that the pitch of the thread is 24 mm and depth is 2 mm 
  2. Cross-sectional area of the threads is 24mm2
  3. The nominal dia of bolt is 24 mm and pitch is 2 mm
  4. The effective diameter of bolt is 24 mm and there are 2 threads per cm

Answer (Detailed Solution Below)

Option 3 : The nominal dia of bolt is 24 mm and pitch is 2 mm
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Detailed Solution

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Explanation:

Designation of bolts:

F1 Ashiq 17.11.20 Pallavi D2

 M 24 × 2 means the nominal diameter of bolt is 24 mm and pitch is 2 mm

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