{
  "title": "Fastener manufacturing data for AI series and length records",
  "source_page": "https://fiund.com/industries/fastener-series-length-reference-data",
  "authorship": "Original fictional Fiund editorial exercise. No actual operating records or third-party source assets are included.",
  "example": {
    "title": "Two equally labeled lengths start from different places",
    "context": "Paper fastener drawings use invented series names and dimension conventions.",
    "records": [
      [
        "1",
        "Glossary",
        "Series F measures from underside of head; series G measures from head top."
      ],
      [
        "2",
        "Order",
        "F length 12 mm on the underside basis."
      ],
      [
        "3",
        "Candidate",
        "G 12 mm overall, head 2 mm high on same axis."
      ]
    ],
    "question": "Does the candidate match the requested length and series?",
    "answer": "No. It is G rather than F, and its equivalent underside-to-tip span is 10 mm (12 − 2), not 12 mm. Records 1–3 require preserving series and converting measurement origin before comparing geometry. This exercise does not determine actual interchangeability.",
    "failureModes": [
      "Matching the printed length without its datum",
      "Treating equal dimensional spans as proof of series equivalence"
    ],
    "fields": [
      [
        "series_id",
        "Selects measurement convention"
      ],
      [
        "length_datum",
        "Identifies the origin"
      ],
      [
        "head_height_mm",
        "Supports the stated origin conversion"
      ]
    ],
    "holdout": "Provide an F candidate measured from the wrong datum and require a conversion without changing its series ID.",
    "boundary": "No real fastener standards, torque guidance, fit decisions or supplier specifications."
  }
}