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Question

Difficulty: MediumSpecialty Fasteners and Anchors

A technician needs to repair stripped internal machine threads in an aluminum engine component so that the original-size bolt can be securely reinstalled. Which TWO of the following specialty fasteners are designed to restore internal machine threads in metal components? (Select TWO correct answers.)

  1. Helical coiled wire insertAnswer
  2. Solid threaded bushing insertAnswer
  3. C
    Expansion lag shield
  4. D
    Self-drilling hollow-wall anchor

Answer

Helical coiled wire insert and Solid threaded bushing insert
Both the helical coiled wire insert and the solid threaded bushing insert are specialty fasteners engineered to repair stripped internal machine threads in metal components. The damaged hole is drilled out and tapped with a specialty oversized tap, and the insert is installed to provide durable, standard-sized internal threads that receive the original bolt.

Step-by-Step Solution

1
Identify the base material and fastener function required in the scenario.
The application requires restoring female machine threads in an aluminum metal casting to accept an original-size machine bolt.
When soft metal internal threads strip out, standard bolts can no longer achieve proper clamping torque without a specialty thread replacement insert.
2
Evaluate the fasteners designed for internal thread restoration in metal versus building substrate anchors.
Helical coiled wire inserts and solid threaded bushing inserts are engineered specifically for metal thread repair, whereas lag shields and hollow-wall anchors are designed for masonry and drywall respectively.
Thread inserts provide wear-resistant internal threads matching standard machine screw thread pitches.

Key Concept

Specialty Thread Repair Inserts and Fasteners
Estimated Time:1m 0s
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Topics

Specialty Fasteners and Anchors

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