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Old 09-29-2012, 09:22 AM
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If ask for a 1/2 bolt, what do you get? a bolt with a 1/2 diam., or 1/2 head? I learned in the steel ind. take the bolt diam. add 1/2 as much (1/2 +1/4 = 3/4)to it + 1/16 for the bolt head size. On Ind. bolts use the same except add 1/8 for the ind. nut size instead of 1/16"
To find the bolt dia. subtract the add-on (1/16 or 1/8) and devide by 3 then mult. by 2.
I had to get some mm bolots and nut the other day. I took 1mm from the head of a bolt (10mm) and got 9, then divided by 3 to get 3 then muli. b+y 2 and got 6. And would you believe it worked.
Hope this helps someone.


Last edited by lanier ledford; 09-29-2012 at 09:28 AM.
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Old 09-29-2012, 10:53 AM
Brian Martin,Freelance adviser
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The problem is there is NO rule as to what head size the bolt is going to have. Thus the reason I wrote the "Basics of Basics" Nuts and Bolts Click here Your explanation is a good one for a general idea though.

I am fascinated at how many "pros" I have worked with that don't get this concept, fascinated! Asking for a 6mm bolt calling it a "ten". insert rolling eyes smilie

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