{
  "section_mm": {
    "across": 5.0,
    "thickness_max": 2.0
  },
  "engagement_threads_min": 3,
  "pitch_mm": 5.08,
  "first_hole_mm": 3.58,
  "end_margin_mm": 6.08,
  "length_added_mm": 4.58,
  "per_rail": 1,
  "threads": [
    {
      "thread": "M3",
      "pitch_mm": 0.5,
      "tap_drill_mm": 2.5
    },
    {
      "thread": "M2.5",
      "pitch_mm": 0.45,
      "tap_drill_mm": 2.05
    },
    {
      "thread": "#4-40 UNC",
      "pitch_mm": 0.635,
      "tap_drill_mm": 2.26
    }
  ],
  "provenance": {
    "section_mm": {
      "kind": "informative",
      "source": "Schroff EuropacPRO p. 6.37; Gie-Tec 138049",
      "note": "Recommended practice; Annex A"
    },
    "pitch_mm": {
      "id": "EIS-RAIL-001",
      "kind": "calculated",
      "from": [
        "EIS-RACK-001"
      ]
    },
    "first_hole_mm": {
      "kind": "informative",
      "source": "34561-484 model",
      "note": "Recommended practice; Annex A"
    },
    "end_margin_mm": {
      "kind": "informative",
      "source": "34561-484 model",
      "note": "Recommended practice; Annex A"
    },
    "length_added_mm": {
      "kind": "informative",
      "from": [
        "EIS-RACK-001"
      ],
      "note": "Recommended practice; Annex A"
    },
    "threads": {
      "id": "EIS-RAIL-003",
      "kind": "calculated",
      "from": [
        "EIS-RAIL-005"
      ],
      "note": "M3"
    },
    "thickness_min": {
      "id": "EIS-RAIL-004",
      "kind": "calculated",
      "from": [
        "EIS-RAIL-006",
        "EIS-RAIL-008"
      ],
      "note": "Three thread pitches"
    }
  }
}