Size

Size is the basic measurement object used throughout the extracted models, from dimensions and chamfers to bores and threads. It stores the numeric value, the unit, and a size type classifying the measurement as linear, angular, diameter, spherical diameter, width across flats, or square. An optional Tolerance records the permitted deviations, fit designation, or tolerance grade attached to the value. Having size information consistently structured simplifies quoting, stock planning, tooling selection, and change detection when a drawing’s proportions evolve, and it supports analytics that look for systemic shifts across product families.

Bases: Quantity

Represents a size definition for a part or feature in an engineering context.

PARAMETER	DESCRIPTION
`value`	The value of the quantity. TYPE: `Decimal`
`unit`	The unit of the quantity. TYPE: `str`
`size_type`	The type of size (e.g., diameter, linear, angular). TYPE: `SizeType`
`tolerance`	The tolerance specifications associated with the size. TYPE: `Tolerance \| None` DEFAULT: `None`

Source code in werk24/models/v2/models.py

class Size(Quantity):
    """
    Represents a size definition for a part or feature in an engineering context.
    """

    size_type: SizeType = Field(
        ...,
        description="The type of size (e.g., diameter, linear, angular).",
        examples=[SizeType.DIAMETER],
    )

    tolerance: Optional[Tolerance] = Field(
        None,
        description="The tolerance specifications associated with the size.",
        examples=[
            Tolerance(
                fit="H7",
                deviation_lower=Decimal("-0.05"),
                deviation_upper=Decimal("0.05"),
                tolerance_grade="IT7",
            )
        ],
    )