{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.screw","code":"thing-q11022","url":"https://ver.cy/models/thing/q11022/","name":"screw","alternateNames":["machine screw","lag screw","furniture screw","Phillips-head screw","flat head screw","Allen screw","Safety screw","wood hanger screw","rail bolt","security screw","fine adjustment screw","captive fastener"],"kind":"thing","status":"published","version":"0.2.0-wave.5","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.OBJ"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"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.","purpose":"Let an agent describe screw types, threads, drives and standards, from engineering sources.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["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."],"structure":{"bundles":[{"id":"screw","name":"Screw","description":"Which screw.","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.","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.","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.","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"}]}]}]}]},"agentConduct":{"may":["describe types and standards"],"mustNot":["give structural design approval"],"requiresHuman":["structural fastening design by engineers"]},"ethics":{"considerations":["safety"],"affectedParties":["users of structures"]},"owners":{"steward":"nobody; a fastener type","roles":[],"masterSystems":[]},"relations":[{"target":"Q186713","type":"parent","note":"registry parent class"},{"target":"Q7797167","type":"parent","note":"registry parent class"},{"target":"fastener","type":"related","note":"hardware"},{"target":"bolt","type":"related","note":"fastener"},{"target":"screw thread","type":"related","note":"geometry"},{"target":"screwdriver","type":"related","note":"tool"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.screw","Wikidata: Q11022 (https://www.wikidata.org/wiki/Q11022)","ISO metric designation: M diameter x pitch","ISO 4762 and similar product standards: standard number socket head cap screws and others"]},"properties":{"applicability":"required","items":["ISO metric thread designation: M followed by nominal diameter in mm, such as M6 x 1 - pitch in mm"]},"recognition":{"applicability":"required","items":["Threaded shank with a slotted, cross, hex or Torx head","A threaded metal shank with a head, often with a slot, cross or hex socket."]},"capabilities":{"applicability":"required","items":["describe types and drives","explain thread standards (ISO metric, UTS)","explain strength grades","explain how to identify a screw by dimensions"]},"hazards":{"applicability":"required","items":["Thread stripping or insufficient engagement","Loosening","Fatigue failure","Drive damage, galling or seizure","Corrosion"]},"interfaces":{"applicability":"required","items":["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)"]},"context":{"applicability":"required","items":["Fastening, securing or positioning parts.","machine screw","wood screw","self-tapping and self-drilling screw","lag screw","set screw","drywall screw","security screws"]}},"sources":[{"title":"Q11022","url":"https://www.wikidata.org/wiki/Q11022","note":"identity of the registry item, labels and sitelinks"},{"title":"Screw","url":"https://en.wikipedia.org/wiki/Screw","note":"general description of the subject"},{"title":"Customs Bulletin and Decisions, Volume 45, Number 31","url":"https://www.cbp.gov/bulletins/Vol_45_No_31_Title.pdf","note":"Multiple design and intended-use criteria distinguish bolts from screws; head operation alone is insufficient."},{"title":"ASTM F880-24: Standard Specification for Stainless Steel Socket, Square Head, and Slotted Headless-Set Screws","url":"https://store.astm.org/f0880-24.html","note":"Existence of headless screws and separate requirements for stainless set screws."},{"title":"ISO 898-1:2013: Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1","url":"https://www.iso.org/standard/60610.html","note":"Property-class scope, covered materials and threads, and exclusion of set screws not under tensile stress."},{"title":"ISO 68-1:2023: ISO general purpose screw threads - Basic and design profiles - Part 1: Metric screw threads","url":"https://www.iso.org/standard/85107.html?browse=tc","note":"ISO metric fastening-thread profiles and the relevant issuing body."},{"title":"ASME B1.1: Unified Inch Screw Threads","url":"https://www.asme.org/codes-standards/find-codes-standards/b1-1-unified-inch-screw-threads-un-unr-thread-form","note":"Unified inch thread forms, series, classes, tolerances and designations."},{"title":"Fastener Design Manual, NASA RP-1228","url":"https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19900009424.pdf","note":"Materials, coatings, corrosion, locking, engagement, fatigue, thread classes and torque considerations."}],"openQuestions":["The registry merges many specific screw types and some assemblies or bolt labels; each needs review."],"resources":{"spec":"/models/things/publications/thing-q11022/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q11022/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-10-22T11:44:46Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-22T13:06:26+00:00: completeness 1.00; sense: Wikidata description; 6 live sources; review by codex: pass"},"score":1.0}}