screw
Enable an AI agent to recognise a screw, assess its compatibility and condition, and determine whether and how it may be installed, adjusted, removed or replaced.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex
Purpose and description
Enable an AI agent to recognise a screw, assess its compatibility and condition, and determine whether and how it may be installed, adjusted, removed or replaced.
It can be Inspect and measure the screw to establish or narrow its identity.; Compare it with a receiving feature or candidate replacement and identify unresolved compatibility checks.; Select a matching drive tool and an applicable installation or adjustment procedure.; Install, tighten, loosen or adjust it when the assembly requirements and action authority are established.; Remove it using a condition-appropriate procedure and reassess its suitability for reuse.; Flag or segregate screws whose damage, identity or documented restrictions prevent intended use..
Distinguishing features
Inspect for an external helical thread intended to engage receiving material or a mating thread; a smooth driven shank alone does not establish screw identity.
Establish whether rotation produces the intended engagement or positional adjustment; distinguish this from fastening primarily by upsetting a rivet or driving a plain nail.
Use the product designation and intended assembly method to resolve screw versus bolt; head shape, a pointed tip or the presence of a nut is insufficient by itself.
For a headless threaded item, inspect its drive, end geometry and intended function to distinguish a set screw from a stud or a length of threaded rod.
Determine whether the item primarily fastens or sets a position, or instead belongs to a motion-transmission mechanism whose registry coverage must be checked.
Scope
+ Screw identity, intended function and evidence supporting its classification
+ Thread, shank, tip, head and drive geometry, including headless forms
+ Material, coating and documented mechanical properties
+ Compatibility with a receiving thread or a material in which the screw creates engagement
+ Installation state, damage, removability and reuse restrictions
- The complete joint, its load path and required fastening performance
- The receiving component, substrate or threaded hole as an independently modelled thing
- Separate nuts, washers, anchors and inserts
- Drivers, taps, drills and torque tools
- Complete screw-driven mechanisms, conveyors and screw pumps
Characteristics
- Screw designation and identification confidence
- Recorded designation; confirmed, provisional or unknown Prevents an appearance-based guess from becoming an authoritative part identity.
- Intended engagement method
- Pre-existing mating thread, thread cutting, thread forming, other documented method or unknown Determines what receiving geometry and preparation must be established.
- Thread designation
- Thread system, profile, size, tolerance designation and governing reference, where known A similar apparent diameter does not establish thread compatibility.
- Thread major diameter
- mm or in; distinguish nominal designation from measured diameter Supports identification and checks against the receiving feature.
- Thread pitch
- mm between adjacent thread forms or threads per inch Helps detect incompatible mating threads.
- Thread handedness and starts
- Right-hand, left-hand or unknown; number of starts if established Informs rotation direction and the relationship between rotation and axial travel.
- Length and threaded extent
- mm or in, with explicit measurement datum and lengths of threaded and unthreaded portions Supports seating, clearance and engagement checks without assuming a universal length convention.
- Head, drive and tip forms
- Recorded head or headless form, drive type and size, and tip geometry Determines tool access, seating behaviour and contact with the receiving material.
- Material, property designation and finish
- Documented material, property class or grade, coating and evidence source; unknown where unverified Constrains substitution, environmental compatibility and permissible installation procedures.
- Receiving feature
- Reference to mating thread, substrate, insert, anchor or contacted component Makes compatibility an explicit relationship rather than an intrinsic claim about the screw.
- Installation and damage state
- Loose, partly engaged, seated or removed; separate observations of thread, drive, body and coating damage Distinguishes assembly position from serviceability.
- Installation control requirement
- Reference to applicable procedure, including torque in N·m or other specified control and its conditions Prevents an agent from treating a generic torque value as applicable to an unidentified screw and joint.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.screw-artifact
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 10 layers · 10 findings · 20 questions.
Screw identity and role Establish what the screw is intended to do and how confidently it has been identified.
Similar threaded items may have different functions and cannot be classified reliably from appearance alone.
Classification boundary
Resolve whether the item belongs to this screw entry.
Fastening or setting role
Record the intended role and evidence distinguishing the item from neighbouring threaded objects.
- Is this item intended to fasten components, retain a component by contact, set a position or transmit continuous motion? definition
- What designation or application evidence resolves its boundary with a bolt, stud, threaded rod or motion-transmission screw? boundary
Designation evidence
Connect the physical screw to records without overstating identification.
Traceable identification
Separate verified product information from inferred identity.
- Which markings, packaging, drawing or supplier record can be linked to this particular screw? provenance
- Which elements of its designation remain inferred, and what inspection would distinguish the remaining candidates? action
Thread and body geometry Describe the geometry that governs engagement, reach and clearance.
Thread mismatch or incorrect reach can defeat fastening even when a screw appears to fit.
Thread interface
Identify the external thread and its relevant dimensional evidence.
Thread match
Record the thread attributes needed to assess a proposed engagement.
- What thread system, profile, nominal size, pitch, handedness and tolerance designation are established? definition
- Which measurements or gauges support those attributes, and with what uncertainty? measurement
Axial extent and tip
Describe the screw's usable threaded extent, body transitions and terminal geometry.
Reach and interference
Support checks for sufficient engagement, bottoming and unintended protrusion.
- What are the screw length, threaded length and unthreaded shank dimensions, and from which datums were they measured? measurement
- Does the tip or any shank transition limit usable engagement, require clearance or contact another component? boundary
Drive, seating and receiver Connect the screw's tool interface and bearing or contact surfaces to its receiving arrangement.
A matching thread alone does not establish that the screw can be driven, seated or used for the intended contact.
Drive and seating surfaces
Describe how rotation is applied and how the screw seats or bears.
Tool and contact fit
Establish the required driver and the intended head or tip contact.
- What drive type and size are present, and is there adequate access for the matching tool? action
- Which head underside, countersink or headless-screw tip surface is intended to bear, and what mating geometry does it require? definition
Receiving engagement
Record how this screw is intended to engage its specific receiver.
Receiver preparation and fit
Identify receiver requirements and unresolved fit checks.
- Does the screw require an existing mating thread, or is it documented to cut or form engagement in the identified material? definition
- What source establishes the required hole preparation, engagement depth and clearance for this screw and receiver combination? provenance
Material and installation limits Record evidence governing mechanical suitability, surface compatibility and installation controls.
Geometrically interchangeable screws may differ in properties or require different installation conditions.
Material and surface evidence
Establish material and finish without inferring them solely from colour or appearance.
Verified properties
Connect material, mechanical property and coating claims to applicable records.
- What evidence establishes the screw's material, property class or grade, coating and any relevant treatment? provenance
- Which restrictions apply when that material and finish contact the proposed receiver or encounter the intended environment? boundary
Controlled installation
Link permitted tightening or adjustment to the actual assembly conditions.
Applicable installation procedure
Record installation controls and the conditions under which they apply.
- Which applicable instruction specifies tightening, adjustment or seating control for this screw in this assembly? provenance
- What lubrication, coating, locking treatment, tool and reuse conditions must be satisfied before applying that instruction? action
Condition, removal and reuse Assess the screw's current engagement, damage and next permissible action.
A seated screw may still be damaged or incorrectly engaged, and successful removal does not establish reusability.
Engagement and damage
Separate observable installation position from evidence of serviceability.
Current fastener state
Record visible condition and uncertainty about concealed engagement.
- Is the screw loose, partly engaged or seated, and what evidence distinguishes correct seating from bottoming or obstructed engagement? measurement
- What thread deformation, drive damage, bending, cracking, corrosion or coating loss is observed, and which regions remain uninspected? measurement
Removal and disposition
Determine how the screw may be removed and what may happen to it afterward.
Permitted next action
Connect removal, replacement and reuse decisions to condition and assembly requirements.
- Before loosening, what joint loads or retained components must be controlled, and what removal method fits the drive and engagement condition? action
- What documented criteria permit reuse or require replacement, and does this screw's installation and removal history satisfy them? action
What the second pass must settle
- Does the registry intend screw to include lead screws, adjustment screws and other motion-transmission forms, or are those owned by neighbouring entries?
- Which existing Vercy world models already cover screw identity or behaviour and should be linked instead of duplicated?
- Which authoritative references should govern screw-versus-bolt classification and thread designations across the product families included here?
- Which family-specific evidence is required to judge receiver preparation, minimum engagement and acceptable damage without inventing universal thresholds?
- How should the model represent concealed thread condition and uncertain installation history when neither inspection nor traceable records can settle reuse suitability?