Published
screw
vr.tr.screw · thing-q11022
Let an agent describe screw types, threads, drives and standards, from engineering sources.
Thing Registry Physical world and living systems PHY.OBJ
Bundle → Layer → Finding → QuestionsClassifiersWhat it isWhy it existsDistinguishing featuresWhat robots and AI may and may not doMoral aspectsOwnersLinks to other meta-modelsIdentity and identifiersDirect propertiesRecognitionCapabilities and actionsHazards and failure modesStandards and interfacesContext of useSources
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Screw Which screw.
Type
Kind.
Type
Kind.
- Which type? boundary
- Per which product standard? provenance
Drive
Head and drive.
Drive
Type and size.
- Which drive? provenance
- Which size? measurement
Thread Geometry.
Thread
Designation.
Thread
Designation.
- Which thread? provenance
- Per which standard? provenance
Dimensions
Length.
Dimensions
Diameter, pitch, length and its reference, thread hand and tolerance class.
- What diameter and length? measurement
- Measured how? provenance
Material Strength.
Material
Steel or other.
Material
Material and finish.
- Which material and coating? provenance
- Per which marking? provenance
Grade
Property class.
Grade
Class.
- Which property class? provenance
- Per which standard? provenance
Use Application.
Application
Joint.
Application
Materials joined.
- What does it join? provenance
- With what load? measurement
Torque
Tightening.
Torque
Value.
- What tightening torque? measurement
- Per which specification? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.OBJ
- Other names and narrower kinds
- 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
What it is Filled
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.
Why it exists Filled
Let an agent describe screw types, threads, drives and standards, from engineering sources.
Distinguishing features Filled
- 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.
What robots and AI may and may not do Filled
Must not
- give structural design approval
Only with a human decision
- structural fastening design by engineers
May
- describe types and standards
Moral aspects Filled
- safety
Who is affected
- users of structures
Owners Filled
Steward
nobody; a fastener type
Links to other meta-models Filled
parent
- Q186713 - registry parent class
- Q7797167 - registry parent class
related
- fastener - hardware
- bolt - fastener
- screw thread - geometry
- screwdriver - tool
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- 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
Direct properties required Filled
- ISO metric thread designation: M followed by nominal diameter in mm, such as M6 x 1 - pitch in mm
Recognition required Filled
- 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 and actions required Filled
- describe types and drives
- explain thread standards (ISO metric, UTS)
- explain strength grades
- explain how to identify a screw by dimensions
Hazards and failure modes required Filled
- Thread stripping or insufficient engagement
- Loosening
- Fatigue failure
- Drive damage, galling or seizure
- Corrosion
Standards and interfaces required Filled
- 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 of use required Filled
- Fastening, securing or positioning parts.
- machine screw
- wood screw
- self-tapping and self-drilling screw
- lag screw
- set screw
- drywall screw
- security screws
Sources Filled
- Q11022 - identity of the registry item, labels and sitelinks
- Screw - general description of the subject
- Customs Bulletin and Decisions, Volume 45, Number 31 - Multiple design and intended-use criteria distinguish bolts from screws; head operation alone is insufficient.
- ASTM F880-24: Standard Specification for Stainless Steel Socket, Square Head, and Slotted Headless-Set Screws - Existence of headless screws and separate requirements for stainless set screws.
- ISO 898-1:2013: Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1 - Property-class scope, covered materials and threads, and exclusion of set screws not under tensile stress.
- ISO 68-1:2023: ISO general purpose screw threads - Basic and design profiles - Part 1: Metric screw threads - ISO metric fastening-thread profiles and the relevant issuing body.
- ASME B1.1: Unified Inch Screw Threads - Unified inch thread forms, series, classes, tolerances and designations.
- Fastener Design Manual, NASA RP-1228 - Materials, coatings, corrosion, locking, engagement, fatigue, thread classes and torque considerations.
Open questions
- The registry merges many specific screw types and some assemblies or bolt labels; each needs review.
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q11022/spec.json