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What is the correct use of a castellated or slotted nut?

A. It is used for blind fasteners.
B. It should be installed with a backing wrench.
C. It should always be used with a lock washer.
D. It is used when the fastener is pinned to the thread body.

Answer :

Final answer:

A castellated or slotted nut is designed to engage with a fastener that is pinned to the thread body, ensuring it remains securely fastened. While it may require a backing wrench for installation, it does not need to be used with a lock washer. The primary function of this type of nut is to prevent movement when pinned correctly.


Explanation:

Understanding Castellated or Slotted Nuts

A castellated or slotted nut is specifically designed to engage with a fastener that is pinned to the thread body. This is part of its purpose and correct usage, distinguishing it from other types of nuts.

Key Features of Castellated Nuts

  • Pinning: This type of nut features slots or castellations that allow for a pin to be inserted, which prevents the nut from spinning or loosening.
  • Installation: While it may seem practical to use a backing wrench, it is particularly important when installing a castellated nut to ensure it is tightened correctly without slippage.
  • Uses: It is not typically paired with a lock washer, as the design of the nut itself fulfills the locking function when properly pinned.

In conclusion, the correct answer regarding the usage of a castellated or slotted nut is that it is used when the fastener is pinned to the thread body.


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