{
  "text_replacements": {
    "O": "0",
    "I": "1", 
    "l": "1",
    "S": "5",
    "G": "6",
    "B": "8",
    "|": "",
    "~": "",
    "`": "",
    " ": " ",
    "Ø": "Ø",
    "±": "±",
    "×": "×"
  },
  "diameter_corrections": {
    "044±0.02": "Ø44±0.02",
    "028-0.03": "Ø28-0.03",
    "0(\\d+)([±\\+\\-]?\\d*\\.?\\d*)": "Ø$1$2"
  },
  "dimension_patterns": [
    "\\d+\\.?\\d*\\s*±\\s*\\d+\\.?\\d*",
    "\\d+\\.?\\d*\\s*\\+\\s*\\d+\\.?\\d*\\s*/\\s*-\\s*\\d+\\.?\\d*",
    "\\d+\\.?\\d*\\s*-\\s*\\d+\\.?\\d*",
    "\\d+\\.?\\d*\\s*\\+\\s*\\d+\\.?\\d*",
    "Ø\\d+\\.?\\d*\\s*±\\s*\\d+\\.?\\d*",
    "Ø\\d+\\.?\\d*\\s*\\+\\s*\\d+\\.?\\d*\\s*/\\s*-\\s*\\d+\\.?\\d*",
    "Ø\\d+\\.?\\d*\\s*-\\s*\\d+\\.?\\d*",
    "Ø\\d+\\.?\\d*\\s*\\+\\s*\\d+\\.?\\d*"
  ],
  "confidence_threshold": 0.7,
  "min_text_length": 1,
  "thread_patterns": [
    "M\\d+[Xx×]\\d+",
    "\\d+[Xx×]\\d+",
    "[A-HG]+\\d*"
  ],
  "iso_tolerance_classes": {
    "H7": {"plus": 0.025, "minus": 0.0},
    "H8": {"plus": 0.039, "minus": 0.0},
    "H9": {"plus": 0.062, "minus": 0.0},
    "F6": {"plus": 0.0, "minus": 0.013},
    "F7": {"plus": 0.0, "minus": 0.025},
    "G6": {"plus": 0.0, "minus": 0.009},
    "G7": {"plus": 0.0, "minus": 0.020}
  }
}