US counterbore standard for (heavy) hex nuts ASME B18.2.2 1

[ballvalve1337]

Hi

unfortunately i am not very familiar with US Standards.
I need a counterbore standard equivalent to DIN 974-2 for ASME B18.2.2 (heavy) hex nuts.
I can find dimensions for socket head cap screw counterbores but not for hex nuts

Any ideas?

Thank you!!!

 

[Stick.]

If you're just looking for a guide to design to (and not a standard to call out on drawings or contracts), you can find this info in Machinery's handbook. Here's a link to the relevant table in an older edition:

http://www.nashua.edu/paradisem1/Machinery's Handbook 27th/27_Fast_08A.pdf#page=59

(copy and paste the whole link since the insert link tool doesn't like this URL)

That same pdf also has dimensions for heavy hex nuts if you need that too.

 

[ballvalve1337]

Good information..this document really helps! Thanks a lot!!!

 

[Jboggs]

ballvalve1337, you need a hard copy of that book yourself. It is the mechanical engineer's bible.

 

[Stick.]

I'll second Jboggs's recommendation. A lot of some of the more basic information in it is also quickly available online (screw dimensions, sheet metal thickness, etc), but quite a few times I've been unable to find the answer I need online, but found it quickly in my Machinery's Handbook (NPT hole tapped depth and engagement comes to mind).

 

[dvd]

The counterbore is more related to the wrench socket diameter required than to the fastener - still this may depend on washer usage. Why is a nut in a counterbore? Is there a radius at the junction between counterbore seat and side of the bore? Is the flange too weak at a thickness relating to distance from opposite side to bottom-of-counterbore that does not allow the counterbore to be eliminated? Ask some critical questions of the application and purpose for this.