Tutorial - Modeling square Head bolt with square Nut in SolidWorks?

Here is the tutorial.
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Step 1:
Top plane>>Sketch.
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Step 2:
Draw a square of 18mm side.
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Step 3:
Extrude it by 7.5mm.
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Step 4:
Top face>>Sketch.
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Step 5:
Draw a square of 10mm side.
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Step 6:
Extrude it by 7.5mm.
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Step 7:
Again Top face and then sketch.
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Step 8:
Draw a circle of 10mm dia tangent to the sides of the box.
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Step 9:
Extrude it by 50mm.
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Step 10:
Bottom face>>Sketch.
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Step 11:
Draw a circle tangent to the sides of the box.
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Step 12:
Extuded cut. Check the flip side to cut with draft enabled at 60º.
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Step 13:
Chamfer.
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Step 14:
Select the top edge at 2mm and 45º.
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Step 15:
Now we have the body.
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Step 16:
After cutting threads.