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Question

Difficulty: EasySpecialty Fasteners and Anchors

Which specialty fastener is inserted through the slots of a castle nut and a drilled hole in a shaft to physically lock the nut in place?

  1. A
    Split lock washer
  2. Cotter pinAnswer
  3. C
    Finishing nail
  4. D
    Snap ring

Answer

Cotter pin
A cotter pin (also called a split pin) is a specialty metal pin with two prongs that is pushed through a cross-drilled hole in a bolt or spindle and through the slots of a castle nut. Once inserted, the legs are bent in opposite directions around the nut, providing a positive mechanical lock that prevents the nut from backing off.

Step-by-Step Solution

1
Identify the fastener assembly described in the problem.
The assembly features a castle (slotted) nut threaded onto a shaft containing a pre-drilled through-hole.
Castle nuts are specifically designed with top slots (castellations) to align with a shaft hole for positive locking.
2
Select the fastener that passes through the aligned slot and hole to mechanically prevent rotation.
A cotter pin is inserted through the assembly and its split ends are bent outward.
This forms a physical shear pin barrier that makes it impossible for the nut to spin off under severe vibration.

Key Concept

Positive mechanical locking fasteners (castle nuts and cotter pins)
Estimated Time:45s
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Topics

Specialty Fasteners and Anchors

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