How to create a nut with curvature on the top or bottom
You can easily use the feature of body to create the nut with the fillet as the above figure
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Step 1:
First of all create a hexagon and a circle in the sketch on XY plane & Pad it to look like this.
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Step 2:
After that go to INSERT -> BODY.
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Step 3:
Now sketch a circumscribed circle for the hexagon on the XY Plane
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Step 4:
Pad the circle to become a cylinder for the same pad length as the hexagon
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Step 5:
Now create a fillet on the cylinder for the required dimension like below.
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Step 6:
Go to INSERT -> BOOLEAN OPERATORS -> INTERSECT as shown in figure
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Step 7:
Select the cylinder first, then after select the paded hexagon, & then click ok to look like this.
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Step 8:
Your required Hexagon nut looks like this. See here.