ThreadSpacing

ThreadSpacing captures supplementary spacing information for threaded features, such as lead, multiple-start configurations, or coil spacing on helical inserts. The model records the spacing value, units, direction, and linkage to the parent thread specification. It also stores notes that clarify whether spacing applies to custom thread forms or specialized applications like screw conveyors. Having thread spacing in a dedicated object ensures downstream tools correctly model the actual helix geometry and select the right tooling or inspection strategies. The additional metadata is helpful when performing kinematic simulations or coordinating with suppliers who need explicit lead information, and it aids in 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")],
    )