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+# 4. Stepped Shaft With Keyway
+
+![Stepped shaft orbit gif](benchmark_04_stepped_shaft_keyway.gif)
+
+## Prompt
+
+Create a single solid stepped shaft STEP model in millimeters.
+
+The shaft axis runs along X. The total length is 120 mm. The left end center is at X = 0, Y = 0, Z = 0.
+
+From X = 0 to X = 30, the shaft diameter is 20 mm. From X = 30 to X = 90, the shaft diameter is 30 mm. From X = 90 to X = 120, the shaft diameter is 20 mm.
+
+Add a 1 mm chamfer to both end edges.
+
+Add a rectangular keyway slot on the top of the 30 mm diameter middle section. The keyway is 6 mm wide in Y, 3 mm deep in Z, and runs from X = 40 to X = 80.
+
+Export as a STEP file.
+
+## Test Cases
+
+| Test | Expected result |
+| --- | --- |
+| STEP import | File imports successfully |
+| Solid count | Exactly one watertight solid |
+| Shaft axis | Along X, not Z |
+| Total length | 120 mm |
+| Left section | Diameter 20 mm, length 30 mm |
+| Middle section | Diameter 30 mm, length 60 mm |
+| Right section | Diameter 20 mm, length 30 mm |
+| Coaxiality | All three cylindrical sections share same X-axis |
+| End chamfers | 1 mm chamfer at both ends |
+| Keyway location | On top of middle section |
+| Keyway length | From X = 40 to X = 80 |
+| Keyway width | 6 mm in Y |
+| Keyway depth | 3 mm downward into shaft |
+| Negative check | Keyway should not pass through the shaft; shaft should not be vertical |