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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