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IfcMechanicalFastenerType.md

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IfcMechanicalFastenerType

The element component type IfcMechanicalFastenerType defines commonly shared information for occurrences of mechanical fasteners. The set of shared information may include:

  • common properties with shared property sets
  • common representations
  • common materials
  • common composition of elements

It is used to define a mechanical fastener type specification indicating the specific product information that is common to all occurrences of that product type. The IfcMechanicalFastenerType may be declared within IfcProject or IfcProjectLibrary using IfcRelDeclares and may be exchanged with or without occurrences of the type. Occurrences of IfcMechanicalFastenerType are represented by instances of IfcMechanicalFastener.

HISTORY New entity in IFC2x2

{ .change-ifc2x4}

IFC4 CHANGE Supertype changed from IfcFastenerType to IfcElementComponentType. Attributes PredefinedType, NominalDiameter, NominalLength added.

{ .use-head} Classification Use Definition

Mechanical fasteners, especially bolts, are often standardized. To refer to a formal fastener designation according to a standard (a product norm), IfcRelAssociatesClassification together with IfcClassificationReference should be used.

  • IfcClassificationReference.Identification contains a machine-readable form of the formal fastener designation from the norm. Example: 'M16X80-10.9-HV' for a high-strength structural bolting assembly for preloading with hexagon bolt and nut. (On the other hand, IfcMechanicalFastenerType.Name contains a displayable name which may not necessarily be the same as the formal designation.)
  • IfcClassificationReference.Name carries the short name of the fastener norm. Example: 'EN 14399-4' as the respective European standard for high-strength hexagon bolts.
  • Optionally, the norm can be further described by IfcClassificationReference.ReferencedSource, including information like publisher and date of issue of the norm.

Furthermore, IfcRelAssociatesLibrary together with IfcLibraryReference may be used to refer to a library which contains fastener definitions.

Attributes

PredefinedType

Subtype of mechanical fastener

NominalDiameter

The nominal diameter describing the cross-section size of the fastener type.

NominalLength

The nominal length describing the longitudinal dimensions of the fastener type.

Formal Propositions

CorrectPredefinedType

The inherited attribute ElementType shall be provided if the PredefinedType is set to USERDEFINED.

Concepts

Mechanical Fastener Type Attributes