Adding ISOThread and UNC Thread

app/schemas/iso_thread.py

@@ -0,0 +1,23 @@
+from pydantic import BaseModel, ConfigDict, Field
+
+
+class IsoThreadBase(BaseModel):
+    diameter_mm: float = Field(..., gt=0, description="Nominal diameter in mm")
+    pitch_mm: float = Field(..., gt=0, description="Thread pitch in mm")
+    depth_mm: float | None = Field(None, gt=0, description="Thread depth in mm")
+
+
+class IsoThreadCreate(IsoThreadBase):
+    pass
+
+
+class IsoThreadUpdate(BaseModel):
+    diameter_mm: float | None = Field(None, gt=0)
+    pitch_mm: float | None = Field(None, gt=0)
+    depth_mm: float | None = Field(None, gt=0)
+
+
+class IsoThreadRead(IsoThreadBase):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: int