Интересно, но в исходной модели уже были ошибки с геометрией модуля зуба, может поэтому в итоге такая ошибка? А так интересная получается альтернатива моделированию.

Create a visually clear simplified hose barb fitting as a STEP model in millimeters.

The part is mostly rotationally symmetric around the X axis. Use the X axis as the main centerline of the fitting. Model the part as one solid body.

The total length of the part is 110 mm.

On the left side, create a threaded cylindrical connection section with nominal G2 thread representation. Do not model a true helical thread; use a simplified cylindrical threaded zone with shallow circular grooves or a cosmetic thread-like surface. The threaded section length is 25 mm.

Add a hexagonal wrench section near the left side of the part. The hex head should be centered on the main axis, with 65 mm across flats and approximately 75 mm across corners, matching the front view. The hex section should have a through bore along the center axis.

Create a central through-hole along the entire part. Use an internal bore diameter of 50 mm through the main body unless another diameter is required by the visible section view.

After the hex/threaded section, create a hose barb tail extending to the right. The barb tail has an outer base diameter of 52 mm.

The barbed section length is 65 mm. It contains four repeated barb ribs, with a pitch of 14 mm, matching the note “4 x 14 = 56”. Each barb should be simplified as an asymmetric triangular/trapezoidal ring profile around the X axis.

For each barb rib, use a shallow conical ramp and a sharper rear shoulder. Use the visible angles from the drawing as a guide: approximately 15 degrees on the shallow ramp side and approximately 45 degrees on the steeper side. The maximum barb crest diameter should be approximately 53.5 mm, and the base diameter should return to approximately 52 mm.

At the right end, add a final straight cylindrical tip section 14 mm long with outside diameter 52 mm.

Add small chamfers on the left and right outer edges, approximately 20 degrees as indicated in the drawing.

Keep the model clean and manufacturable. Use simplified CAD geometry, not mesh geometry. Ensure all features are joined into one valid solid body. If the true G2 thread is difficult to model, represent it as a plain cylindrical threaded zone with shallow circular grooves, but keep the overall proportions and dimensions correct.