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Difficulty: MediumSpecialty Fasteners and Anchors

When anchoring heavy machinery, such as a floor-standing drill press, onto a solid poured concrete shop floor, which specialty fastener is designed to mechanically expand its collar against the drilled hole walls to deliver high pull-out and shear resistance?

  1. A
    Plastic expansion plug
  2. Wedge anchorAnswer
  3. C
    Spring-wing toggle bolt
  4. D
    Blind pop rivet

Answer

Wedge anchor
A wedge anchor (often called an expansion bolt or stud anchor) is engineered specifically for solid concrete applications. When inserted into a hole drilled to match its diameter and torqued down, the tapered lower section draws upward into a split steel collar, expanding it outward into the concrete walls to provide superior tensile and shear resistance.

Step-by-Step Solution

1
Identify the base material and load requirements from the scenario.
The substrate is solid poured concrete, and the application involves heavy, vibrating shop equipment requiring high tensile and shear strength.
Different specialty fasteners are engineered for specific base substrates (solid masonry vs. hollow walls vs. sheet metal) and load capacities.
2
Evaluate the mechanical holding mechanism of the fastener options.
A wedge anchor features a tapered mandrel with a steel expansion collar that wedges tightly into solid concrete as the outer nut is torqued down.
This mechanical wedge action generates immense friction and grip against solid concrete walls without relying on a hollow cavity.

Key Concept

Heavy-duty mechanical expansion anchors for solid concrete substrates
Estimated Time:45s
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Topics

Specialty Fasteners and Anchors

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