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Difficulty: MediumSpecialty Fasteners and Anchors

A fabricator is assembling an enclosed sheet-metal housing where the back side of the joint is completely inaccessible. Which of the following specialty fasteners are specifically designed for blind installation from only one side of the workpiece? (Select all correct answers.)

  1. Blind (pop) rivetsAnswer
  2. B
    Standard hex-head cap screws with hex nuts
  3. Threaded rivet nuts (blind insert nuts)Answer
  4. D
    Common penny wire nails

Answer

Blind (pop) rivets and threaded rivet nuts (blind insert nuts) are the correct specialty fasteners for single-sided blind assembly.
Blind (pop) rivets and threaded rivet nuts are engineered specifically for blind fastening. A blind rivet consists of a tubular rivet body and an internal mandrel; when the installation tool pulls the mandrel, it deforms the blind end of the rivet into a bulb before snapping off. A threaded rivet nut functions similarly by collapsing a tubular shank against the back of the sheet to lock a permanent threaded insert into place, requiring access to only one side.

Step-by-Step Solution

1
Analyze the assembly constraint described in the scenario
The rear side of the sheet-metal housing is enclosed and inaccessible, requiring blind fasteners operable entirely from one side.
Blind fasteners are specifically engineered to mechanically deform and clamp material without requiring backing tools or rear access.
2
Evaluate the mechanical function of each candidate fastener
Blind rivets expand via an internal pulled mandrel, and rivet nuts collapse a rear sleeve to create a captive female thread. Both operate from a single accessible side. Standard nuts and bolts require two-sided access, and common nails are wood fasteners relying on fibrous friction.
Identifying the operating mechanism determines which fasteners satisfy the blind installation requirement.

Key Concept

Blind Fasteners and Single-Sided Sheet Metal Anchoring
Estimated Time:1m 0s
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Topics

Specialty Fasteners and Anchors

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