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Difficulty: MediumGripping and Holding Tools

When assembling threaded iron piping, which tool utilizes hardened directional teeth and a floating hook jaw designed to wedge tighter against cylindrical stock as rotational force is applied?

  1. A
    Adjustable wrench
  2. Pipe wrenchAnswer
  3. C
    Needle-nose pliers
  4. D
    Bench-mounted machinist vise

Answer

Pipe wrench
A pipe wrench is specifically engineered for turning cylindrical workpieces. Its floating hook jaw is mounted with slight clearance, allowing it to pivot toward the fixed heel jaw when rotational force is exerted in the forward direction. This rocking action causes the hardened, angled teeth to dig into the metal pipe and increase clamping friction proportionally with applied torque.

Step-by-Step Solution

1
Analyze the workpiece geometry and functional requirement
The task involves applying rotational force to round, cylindrical iron pipe lacking flat drive surfaces.
Tools with smooth, parallel jaws slip on round stock, necessitating aggressive directional grip.
2
Evaluate the mechanical design of candidate gripping tools
The pipe wrench possesses a pivoting hook jaw that pivots toward the fixed heel jaw as torque is applied.
This toggle-wedge action forces the hardened, serrated teeth to bite into the surface of the pipe, preventing slippage during rotation.

Key Concept

Directional wedging mechanics and serrated jaw design in pipe gripping tools
Estimated Time:45s
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Topics

Gripping and Holding Tools

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