Tutorial - Modeling Unified screw threads on bolt in SolidWorks?

Here is the tutorial.
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Step 1:
Start SolidWorks in part mode.
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Step 2:
Top plane>>Sketch.
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Step 3:
Draw a circle of 20mm dia.
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Step 4:
Extrude it by 50mm.
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Step 5:
Top face>>Sketch.
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Step 6:
Draw a polygon inside a circle of 32.5mm dia.
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Step 7:
Extrude it by 10mm.
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Step 8:
Top face>>sketch.
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Step 9:
Draw a circle tangent to sides of polygon.
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Step 10:
Extruded cut.
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Step 11:
Check flip side to cut. Draft enable at 45.00º.
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Step 12:
Chamfer.
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Step 13:
At distance of 3mm & angle 45º.
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Step 14:
Top plane>>sketch.
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Step 15:
Select the outer edge and then convert entities.
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Step 16:
Curves>>Helix and spiral.
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Step 17:
Defined by Pitch and revolution. Pitch=3mm and revolution = 15.
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Step 18:
Right plane>>sketch.
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Step 19:
Draw a profile like this. Since pitch is 3mm so keep the length be little less than pitch since at 3mm it will have intersection error.
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Step 20:
Sweep cut.
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Step 21:
Select the profile and the helix as the path.
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Step 22:
And we have the unified screw threads.