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Question

Difficulty: EasyWrenches

A technician needs to assemble threaded steel conduit sections that have smooth, round cylindrical surfaces without flat hexagonal sides. Which type of wrench is specifically designed with hardened, serrated jaws that pivot to bite into round stock when turning force is applied?

  1. A
    Flare-nut wrench
  2. Pipe wrenchAnswer
  3. C
    Box-end wrench
  4. D
    Adjustable open-end wrench

Answer

Pipe wrench
The pipe wrench is engineered specifically for round stock and piping. Its upper hook jaw is loosely mounted in a threaded collar, allowing it to pivot slightly so its sharp, hardened teeth bite deeper into the pipe surface as rotational force increases.

Step-by-Step Solution

1
Analyze the workpiece geometry described in the scenario.
The workpiece is a smooth, round cylindrical pipe lacking flat hexagonal drive surfaces.
Standard wrenches require flat parallel surfaces or multi-point hex corners to transfer turning force.
2
Evaluate the gripping mechanism of specialized hand wrenches.
A pipe wrench (Stillson wrench) possesses hardened, directional teeth cut into pivoting jaws.
When turned in the operating direction, the upper hook jaw rocks slightly in its housing to wedge and dig into the curved steel surface, providing non-slip leverage.

Key Concept

Identifying specialized wrench designs and selecting a pipe wrench for round cylindrical stock.
Estimated Time:45s
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Topics

Wrenches

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