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Difficulty: HardFasteners and Joints

Match each specialized fastener or component to the primary mechanical function it serves in an assembly.

  • Shoulder BoltProvides a smooth, unthreaded cylindrical bearing surface for rotating or sliding components.
  • Belleville WasherActs as a heavy-duty spring to compensate for thermal expansion or loss of tension in a bolted joint.
  • Castellated NutUtilizes a cross-drilled hole and a securing pin to physically block rotational loosening.
  • Blind RivetExpands a deformable body against the inaccessible side of a panel using a break-away mandrel.

Answer

Shoulder Bolt matches with providing a bearing surface; Belleville Washer matches with compensating for thermal expansion; Castellated Nut matches with physically blocking rotation; Blind Rivet matches with expanding against an inaccessible panel.
Each fastener has a specific design intended for a unique mechanical application. Shoulder bolts provide bearing surfaces, Belleville washers maintain tension through spring action, castellated nuts provide positive locking via a pin, and blind rivets allow for one-sided installation.

Step-by-Step Solution

1
Analyze the function of a Shoulder Bolt.
Identified that it has an unthreaded 'shoulder' section.
This unthreaded section acts as a dowel or pivot point for linkages, pulleys, or sliding components.
2
Analyze the function of a Belleville Washer.
Identified that it is a conical spring washer.
Its conical shape allows it to act as a heavy spring, absorbing vibrations and thermal expansion to maintain bolt tension.
3
Analyze the function of a Castellated Nut.
Identified that it has slots cut into one end.
These slots are designed to receive a cotter pin that passes through the bolt, creating a positive lock against rotation.
4
Analyze the function of a Blind Rivet.
Identified that it is used when only one side of the workpiece is accessible.
A tool pulls a mandrel that deforms the blind end, clamping the materials together before the mandrel breaks off.

Key Concept

Specialized Fasteners and Locking Mechanisms
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Topics

Fasteners and Joints

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