ThreadSpacing

ThreadSpacing captures the spacing of a threaded feature in both common conventions: the pitch in millimetres and the equivalent number of threads per inch. Having both values in a dedicated object means downstream tools can work in metric or imperial units without conversion errors, correctly model the thread geometry, and select the right tooling or inspection strategies. The explicit spacing is also helpful when coordinating with suppliers and when detecting anomalies between nominal and measured thread advance.

300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315

class ThreadSpacing(BaseModel):
    """
    Represents the spacing of a thread, defining the distance between thread crests.
    """

    pitch_in_mm: Decimal = Field(
        ...,
        description="The pitch of the thread, defining the distance between thread crests.",
    )

    threads_per_inch: Decimal = Field(
        ...,
        ge=0,
        description="The number of threads per inch (TPI) for imperial threads. Must be non-negative.",
        examples=[Decimal("20")],
    )