Beveled Washer Help

[daniel.tarnowski]

I have tried researching several threads in the forums and I still haven't had success.

I am trying to create the following bolt set in 3/4" diameter:

A325 bolt, F436 Washer, Beveled S Washer, A563 Nut

The photos shown are for a handrail attachment to a channel stringer.  For certain plate thicknesses, the nut doesn't look correct when using a beveled/tapered washer, but looks fine if I change it to NaW or Na2W.

I suspect this has something to do with my rules, and I have tried making some changes to them with no luck.

I have attached two screenshots of what I am talking about, one without the beveled washer and one with.

From what I gather, my minimum length should be: grip + 3/16(F436 washer) + 7/16" (Beveled washer) +1" (A563 nut+1/4")

Any help is greatly appreciated. 

Thank you.

[mick-CNF]

Change these values and apply in first image to get positive values in second image.

[lim.wendy]

Hi Daniel,

Thank you for submitting your question in our discussion forums. I wanted to reach out and see if you have this issue figured out or not. It looks like @mick-CNF gave provided you with some steps. Did it solve the issue? 

Please let us know if you require further assistance.

Remember to mark your posts as having an "Accepted Solution" if a solution is found as it helps other forum users with the same issue – so don't be shy about marking it as a solution! Accepted solutions get viewed more and help more users find the answer to their problems. . You could unmark the post as an accepted solution if the solution did not work. Click the ellipsis menu  > Not the Solution to cancel an accepted answer. 

[acbsdesign · Accepted solution]

@daniel.tarnowski 

The thickness at the axis of a 3/4" dia beveled washer is 5/16", Table 7-14 AISC 15th, down on the bottom of the table, it is now a note, not a line in the table as it used to be.

For 3/4" bolt-nut---beveled washer-nut my set up is:

Example:

Bolts through 1" plate:

1+1/8 (roughly) for flat washer+5/16+1=2 7/16" 

For 1 1/8" plate:

1 1/8+1/8+5/16+1=2.56"

I hope this helps.

Happy Veterans Day.

[daniel.tarnowski]

Thank you Ilko for sharing your rule settings for grip length.

I was having a difficult time trying different combinations of parameters as previously suggested.  Just when I found a combination I thought worked, if I changed the base plate thickness in the example I had, certain thicknesses would fail.

I guess I don't fully understand the bolt length calculation rules.

This poses another question I have about bolt sets.  I will create a separate post for that.

Thank you all for helping me with this issue.