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SESK: Stuff Everyone Should Know · sesk.info/ham-turnbuckle-safety-wire

Why put a safety wire through a guy-line turnbuckle?

The wire prevents vibration from loosening the turnbuckle.

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  1. Provide a lightning path
  2. Prevent vibration from loosening it ✔
  3. Measure guy-line tension

Why: Wind and other vibration can slowly rotate a turnbuckle. A safety wire locks it in position so the guy-line tension stays set.

Huh, didn't know that: A turnbuckle adjusts tension by changing its effective length.

The dad joke
The turnbuckle used safety wire so it would not unwind after work.
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References

Answer: Prevent vibration from loosening it. Wind and other vibration can slowly rotate a turnbuckle. A safety wire locks it in position so the guy-line tension stays set.

  1. NCVEC 2026-2030 Technician Question Pool www.ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    B. Prevent loosening of the turnbuckle from vibration
    Checked 2026-10-09.

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