The dimension of a nut is expressed in terms of:

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ALP CBT 2 Fitter Previous Paper: Held on 21 Jan 2019 Shift 1
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  1. pitch diameter of the bolt
  2. core diameter of the bolt 
  3. nominal diameter of the bolt
  4. head of the bolt 

Answer (Detailed Solution Below)

Option 3 : nominal diameter of the bolt
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Detailed Solution

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Explanation:

  • Nuts are used along with bolts in an assembly which may loosen due to vibration.
  • Different types of nut-locking devices are used depending on the severity of the condition in which the fastener is used.
  • The following are the most commonly used types:
    • Swan nut
    • Groove nut
    • Castle nut
    • Lock nut
  • The dimensions of a bolt head or a nut cannot be expressed exactly in terms of the nominal diameter of the bolt.
  • However, for engineering drawing purposes, the dimensions are approximated in terms of the diameter "d".

26 June 1

The height of the standard hexagonal nut is 0.8 d. The threads of the bolt in the standard nut will not fail by shear. So, the height of the nut is the most important design dimension.

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