Backbore

{
  "id": "MLC-T-IND-000368",
  "term": "Backbore",
  "field": "Industrial and trades",
  "definition": "To enlarge the diameter of a previously drilled hole from the side opposite to its initial entry. This machining operation is performed to create a recess for a fastener head, a shoulder for a bearing, or to reduce the weight of a component without affecting the entry-side diameter. Backboring requires specialized tooling that can be inserted through the existing hole and then expanded to cut the larger diameter.",
  "subject": "Machining",
  "see_also": [
    "overbore"
  ],
  "references": [
    "Back counterboring (Hermann Bilz)"
  ],
  "translations": {
    "de": "Rückseiten-Bohren",
    "es": "mandrinado posterior",
    "fr": "contre-aléser"
  },
  "url": "https://mlchart.com/terminology/industrial/backbore/"
}