What's the spec for the bevel on nuts?

[Mainer]

As evidence that I am becoming WAY too compulsive.....

I just made some scale 6-40 nuts in the proportions of "heavy hex" nuts. The thickness and across flats dimensions were easy to figure out from Machinery's Handbook specs. The detail I couldn't find in several reference books or on the web though, was any spec for the bevel that breaks the corners on the top of the nut. I used 30 degrees, but I think that may be a little shallow, and I think that to be strictly correct it should perhaps be a large radius.

Have any of you guys obsessed about this detail? What did you do about it?

 

[rake60]

It should be a 30° angle.
It is cut to a diameter equal to the distance across the flats.

Rick

 

[kustomkb]

Personally i use 45 deg. and chamfer just slighly more than the major diameter.

 

[Loose nut]

As evidence that I am becoming WAY too compulsive.....

Not really, a good model is all in the details. The better the small items look the better the whole model will appear, even though you may not see the individual parts as themselves.

 

[Mainer]

Here's a photo showing how they came out.