{
  "step_valid": true,
  "solid_count": 1,
  "exact_size_mm": [50.0, 50.0, 4.0],
  "outer_radius_mm": 25.0,
  "inner_radius_mm": 10.0,
  "m3_clearance_hole_radius_mm": 1.7,
  "m3_clearance_hole_count": 8,
  "bolt_circle_radius_mm": 20.0,
  "angular_spacing_deg": [45.0, 45.0, 45.0, 45.0, 45.0, 45.0, 45.0, 45.0],
  "visual_review": "passed_iso_opposite_top_front"
}