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Difficulty: EasySpecialty Fasteners and Anchors

A mechanic needs to secure heavy shop machinery bases directly to a solid poured-concrete floor. Which of the following fasteners are specifically engineered to anchor fixtures into solid concrete? (Select all that apply.)

  1. Concrete sleeve expansion anchorsAnswer
  2. B
    Light-duty plastic conical wall anchors
  3. Hardened screw-in concrete anchorsAnswer
  4. D
    Standard fine-thread drywall screws

Answer

Concrete sleeve expansion anchors and hardened screw-in concrete anchors are the fasteners engineered specifically for securing fixtures into solid concrete.
Both concrete sleeve expansion anchors and hardened screw-in concrete anchors are specifically manufactured to grip dense, non-hollow concrete. Sleeve anchors expand radially against drilled concrete hole walls when tightened, while hardened concrete screws tap directly into the concrete, providing the required tensile and shear strength for heavy machinery.

Step-by-Step Solution

1
Identify the base material and load requirements from the scenario.
The substrate is solid poured concrete and requires securing heavy shop machinery.
Matching anchor design to the substrate material and load magnitude is required for safe fastening.
2
Evaluate the fastener options designed specifically for solid concrete.
Sleeve expansion anchors and hardened screw-in concrete anchors provide mechanical interlock and friction in solid concrete, whereas drywall screws and plastic conical plugs are designed for hollow wall or light-duty drywall applications.
Specialty concrete anchors use expansion or thread-cutting mechanisms designed exclusively for masonry substrates.

Key Concept

Selection and mechanical principles of specialty masonry and concrete anchors
Estimated Time:45s
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Topics

Specialty Fasteners and Anchors

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