{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-10-22T11:44:46Z",
    "providers": [
      "Claude"
    ],
    "breadth": "researched by Claude against the sources listed below",
    "pass": 2,
    "wave": 5,
    "engine": "claude",
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-22T13:06:26+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "6 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q11022",
    "registryId": "vr.tr.screw",
    "name": "screw",
    "version": "0.2.0-wave.5",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.OBJ"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q11022/",
  "model": {
    "registry_id": "vr.tr.screw",
    "name": "screw",
    "purpose": "Let an agent describe screw types, threads, drives and standards, from engineering sources.",
    "definition": "A fastener with a helical thread around a cylindrical or tapered shank, usually with a head and drive (many set screws are headless), used to join or position parts by engaging a mating internal thread or by forming its own thread in the material; the boundary with bolts varies by usage and terminology standard.",
    "what_it_is_for": "Fastening, securing or positioning parts.",
    "affordances": [
      "describe types and drives",
      "explain thread standards (ISO metric, UTS)",
      "explain strength grades",
      "explain how to identify a screw by dimensions"
    ],
    "distinguishing_features": [
      "ISO metric threads have a 60-degree thread angle (ISO 68-1).",
      "Wood and self-tapping screws form their own thread; machine screws need a tapped hole or nut.",
      "Property classes such as 8.8 and 10.9 (ISO 898-1) apply to carbon and alloy steel; set screws use ISO 898-5 and stainless fasteners other standards."
    ],
    "appearance": "A threaded metal shank with a head, often with a slot, cross or hex socket.",
    "visual_identification": [
      "Threaded shank with a slotted, cross, hex or Torx head"
    ],
    "physical_properties": [
      {
        "quantity": "ISO metric thread designation",
        "typical_range": "M followed by nominal diameter in mm, such as M6 x 1",
        "unit": "",
        "note": "pitch in mm"
      }
    ],
    "families_and_kinds": [
      "machine screw",
      "wood screw",
      "self-tapping and self-drilling screw",
      "lag screw",
      "set screw",
      "drywall screw",
      "security screws"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "fastener",
        "why": "hardware"
      },
      {
        "relation": "is related to",
        "target": "bolt",
        "why": "fastener"
      },
      {
        "relation": "is related to",
        "target": "screw thread",
        "why": "geometry"
      },
      {
        "relation": "is related to",
        "target": "screwdriver",
        "why": "tool"
      }
    ],
    "identifiers": [
      {
        "scheme": "ISO metric designation",
        "value_or_pattern": "M diameter x pitch",
        "note": ""
      },
      {
        "scheme": "ISO 4762 and similar product standards",
        "value_or_pattern": "standard number",
        "note": "socket head cap screws and others"
      }
    ],
    "standards_and_regulation": [
      "ISO 68-1 and ISO 261 metric threads",
      "ASME B1.1 Unified Inch Screw Threads",
      "ISO 898-1 and ISO 898-5 mechanical properties",
      "ISO 1891 fastener terminology (notes regional usage differences)"
    ],
    "failure_modes_and_hazards": [
      "Thread stripping or insufficient engagement",
      "Loosening",
      "Fatigue failure",
      "Drive damage, galling or seizure",
      "Corrosion"
    ],
    "agent_conduct": {
      "may": [
        "describe types and standards"
      ],
      "must_not": [
        "give structural design approval"
      ],
      "requires_human": [
        "structural fastening design by engineers"
      ]
    },
    "ethics": {
      "considerations": [
        "safety"
      ],
      "affected_parties": [
        "users of structures"
      ]
    },
    "owners": {
      "steward": "nobody; a fastener type",
      "master_systems": []
    },
    "facets_not_applicable": {},
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": []
  },
  "sources": [
    {
      "id": "SRC-001",
      "title": "Q11022",
      "publisher": "Wikidata",
      "url": "https://www.wikidata.org/wiki/Q11022",
      "what_it_supports": "identity of the registry item, labels and sitelinks",
      "url_status": "live"
    },
    {
      "id": "SRC-002",
      "title": "Screw",
      "publisher": "Wikipedia",
      "url": "https://en.wikipedia.org/wiki/Screw",
      "what_it_supports": "general description of the subject",
      "url_status": "live"
    },
    {
      "id": "SRC-003",
      "title": "Customs Bulletin and Decisions, Volume 45, Number 31",
      "publisher": "U.S. Customs and Border Protection",
      "url": "https://www.cbp.gov/bulletins/Vol_45_No_31_Title.pdf",
      "what_it_supports": "Multiple design and intended-use criteria distinguish bolts from screws; head operation alone is insufficient.",
      "url_status": "live"
    },
    {
      "id": "SRC-004",
      "title": "ASTM F880-24: Standard Specification for Stainless Steel Socket, Square Head, and Slotted Headless-Set Screws",
      "publisher": "ASTM International",
      "url": "https://store.astm.org/f0880-24.html",
      "what_it_supports": "Existence of headless screws and separate requirements for stainless set screws.",
      "url_status": "live"
    },
    {
      "id": "SRC-005",
      "title": "ISO 898-1:2013: Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1",
      "publisher": "International Organization for Standardization",
      "url": "https://www.iso.org/standard/60610.html",
      "what_it_supports": "Property-class scope, covered materials and threads, and exclusion of set screws not under tensile stress.",
      "url_status": "blocked"
    },
    {
      "id": "SRC-006",
      "title": "ISO 68-1:2023: ISO general purpose screw threads - Basic and design profiles - Part 1: Metric screw threads",
      "publisher": "International Organization for Standardization",
      "url": "https://www.iso.org/standard/85107.html?browse=tc",
      "what_it_supports": "ISO metric fastening-thread profiles and the relevant issuing body.",
      "url_status": "live"
    },
    {
      "id": "SRC-007",
      "title": "ASME B1.1: Unified Inch Screw Threads",
      "publisher": "American Society of Mechanical Engineers",
      "url": "https://www.asme.org/codes-standards/find-codes-standards/b1-1-unified-inch-screw-threads-un-unr-thread-form",
      "what_it_supports": "Unified inch thread forms, series, classes, tolerances and designations.",
      "url_status": "live"
    },
    {
      "id": "SRC-008",
      "title": "Fastener Design Manual, NASA RP-1228",
      "publisher": "National Aeronautics and Space Administration",
      "url": "https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19900009424.pdf",
      "what_it_supports": "Materials, coatings, corrosion, locking, engagement, fatigue, thread classes and torque considerations.",
      "url_status": "unverified"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "screw",
        "name": "Screw",
        "description": "Which screw.",
        "rationale": "Type first.",
        "layers": [
          {
            "id": "type",
            "name": "Type",
            "description": "Kind.",
            "findings": [
              {
                "id": "type",
                "name": "Type",
                "description": "Kind.",
                "questions": [
                  {
                    "text": "Which type?",
                    "kind": "boundary"
                  },
                  {
                    "text": "Per which product standard?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "drive",
            "name": "Drive",
            "description": "Head and drive.",
            "findings": [
              {
                "id": "drive",
                "name": "Drive",
                "description": "Type and size.",
                "questions": [
                  {
                    "text": "Which drive?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which size?",
                    "kind": "measurement"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "thread",
        "name": "Thread",
        "description": "Geometry.",
        "rationale": "Threads are standardised.",
        "layers": [
          {
            "id": "thread",
            "name": "Thread",
            "description": "Designation.",
            "findings": [
              {
                "id": "thread",
                "name": "Thread",
                "description": "Designation.",
                "questions": [
                  {
                    "text": "Which thread?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Per which standard?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "dimensions",
            "name": "Dimensions",
            "description": "Length.",
            "findings": [
              {
                "id": "dimensions",
                "name": "Dimensions",
                "description": "Diameter, pitch, length and its reference, thread hand and tolerance class.",
                "questions": [
                  {
                    "text": "What diameter and length?",
                    "kind": "measurement"
                  },
                  {
                    "text": "Measured how?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "material",
        "name": "Material",
        "description": "Strength.",
        "rationale": "Grades define strength.",
        "layers": [
          {
            "id": "material",
            "name": "Material",
            "description": "Steel or other.",
            "findings": [
              {
                "id": "material",
                "name": "Material",
                "description": "Material and finish.",
                "questions": [
                  {
                    "text": "Which material and coating?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Per which marking?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "grade",
            "name": "Grade",
            "description": "Property class.",
            "findings": [
              {
                "id": "grade",
                "name": "Grade",
                "description": "Class.",
                "questions": [
                  {
                    "text": "Which property class?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Per which standard?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "use",
        "name": "Use",
        "description": "Application.",
        "rationale": "Correct use prevents failure.",
        "layers": [
          {
            "id": "application",
            "name": "Application",
            "description": "Joint.",
            "findings": [
              {
                "id": "application",
                "name": "Application",
                "description": "Materials joined.",
                "questions": [
                  {
                    "text": "What does it join?",
                    "kind": "provenance"
                  },
                  {
                    "text": "With what load?",
                    "kind": "measurement"
                  }
                ]
              }
            ]
          },
          {
            "id": "torque",
            "name": "Torque",
            "description": "Tightening.",
            "findings": [
              {
                "id": "torque",
                "name": "Torque",
                "description": "Value.",
                "questions": [
                  {
                    "text": "What tightening torque?",
                    "kind": "measurement"
                  },
                  {
                    "text": "Per which specification?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "The registry merges many specific screw types and some assemblies or bolt labels; each needs review."
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}