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Need to be able to use two different bolt in a hole

Need to be able to use two different bolt in a hole

Need to be able to use two different bolt in a hole

(OP)
I need to be able to use both a 3/8" bolt and a 5/16" lag in a hole in a small U-bracket while being code compliant. We use a AISI Standard as our guide. According to it the largest whole I can use for the 5/16" lag is a 0.375" with a washer. I was wondering is there is a way around this max hole size by using a thick oversized washer. If so, what standard can I use to justify it.  

RE: Need to be able to use two different bolt in a hole

Lags are typically used in wood??!!  Once you use that - the 5/16'' isn't going to be worth a crap!!!

RE: Need to be able to use two different bolt in a hole

LDevitt, seems odd that the presumably weaker connection uses the smaller fastener. Why not make both the same diameter?

Regards,

Mike

RE: Need to be able to use two different bolt in a hole

(OP)
The 5/16" is for a connection to a wooden beam, while the 3/8" is for an existing bolt hole.
The PM doesn't want to increase every thing to 3/8" because it would be wasted material and cost.

RE: Need to be able to use two different bolt in a hole

Can you provide a sketch showing the use of the lag and 3/8 bolt?  Is the 3/8 bolt a 'through bolt'?  I don't understand the application.

Dik

RE: Need to be able to use two different bolt in a hole

(OP)
The U-bracket is similar to the one shown. It is supposed to hold a leg that will resist wind and snow loads on a roof. Most of the time it will be mounted directly to the roof using the 5/16" lag. But occationally it will be used with a stand-off using a 3/8".
http://www.civicsolar.com/sites/default/files/imagecache/product_full/product_images/panels/tiltleg.JPG

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