{
  "schema": "torque-sequence-ledger-v1",
  "author": "anaisha-cotton",
  "source_page": "https://anaisha-cotton.4ort.net/torque-sequence.html",
  "ground_spec": {
    "nominal_torque_ft_lbs": 140,
    "nominal_torque_nm": 189.8,
    "fastener_grade": "ASTM-F3125-A325",
    "wikidata_qid": "Q7826786",
    "verification_source": "Antonio_field_measurement_Cartagena_Protocol_2026"
  },
  "tightening_sequence": [
    {
      "step": 1,
      "torque_ft_lbs": 70,
      "pattern_position": "center_anchor",
      "percent_yield": 50
    },
    {
      "step": 2,
      "torque_ft_lbs": 70,
      "pattern_position": "opposite_pair",
      "percent_yield": 50
    },
    {
      "step": 3,
      "torque_ft_lbs": 105,
      "pattern_position": "star_arms_extend",
      "percent_yield": 75
    },
    {
      "step": 4,
      "torque_ft_lbs": 105,
      "pattern_position": "second_radius",
      "percent_yield": 75
    },
    {
      "step": 5,
      "torque_ft_lbs": 140,
      "pattern_position": "full_yield",
      "percent_yield": 100
    },
    {
      "step": 6,
      "action": "verify_mark_witness",
      "torque_ft_lbs": null,
      "percent_yield": null
    }
  ],
  "pre_tightening_checklist": [
    "bolt_threads_clean_lubricated_per_spec",
    "washers_seated_flush_no_rocking",
    "torque_wrench_calibrated_within_24_hours",
    "sequence_diagram_pinned_to_work_station",
    "witness_present_for_final_pass"
  ],
  "warnings": [
    "SEQUENTIAL_TIGHTENING_ONLY",
    "RANDOM_ORDER_EQUALS_CATASTROPHIC_JOINT_FAILURE"
  ]
}