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  #1  
Old 03-04-2005, 08:50 PM
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I got stuck talking to an old man at Home Depot today

One of those old farts cornered me and I couldn’t make a run for it.

However, he gave me a great piece of information that I would like to share.

How to figure out the wrench size of a bolt from the thread diameter.

Metric: Multiply the diameter of the threaded part of the bolt by 1.5 and add 1mm
Ex. 6mm bolt x 1.5 + 1mm = 10mm wrench

Standard: Multiply the diameter of the threaded part of the bolt by 1.5 and add 1/8
Ex. 3/8 bolt x 1.5 + 1/8 = 3/4in wrench
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  #2  
Old 03-04-2005, 09:02 PM
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Quote:
Originally Posted by brabus
One of those old farts cornered me and I couldn’t make a run for it.

However, he gave me a great piece of information that I would like to share.

How to figure out the wrench size of a bolt from the thread diameter.

Metric: Multiply the diameter of the threaded part of the bolt by 1.5 and add 1mm
Ex. 6mm bolt x 1.5 + 1mm = 10mm wrench

Standard: Multiply the diameter of the threaded part of the bolt by 1.5 and add 1/8
Ex. 3/8 bolt x 1.5 + 1/8 = 3/4in wrench
Thats cool.................first time I ever heard that before.
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  #3  
Old 03-04-2005, 09:30 PM
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Don't rely on that too much....

Because the formula doesn't seem to work for standard bolts.

Examples - a 1/4 inch bolt takes a 7/16 wrench. The formula listed would tell you to use a 1/2 inch wrench.


A 3/8 bolt takes a 9/16 wrench, not a 3/4 inch wrench as you have listed. By the formula, a 3/8 bolt would need an 11/16 wrench, not exactly 3/4.

So much for free advice.

SteveM.
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  #4  
Old 03-04-2005, 09:42 PM
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Quote:
Originally Posted by brabus
One of those old farts cornered me and I couldn’t make a run for it.

However, he gave me a great piece of information that I would like to share.

How to figure out the wrench size of a bolt from the thread diameter.

Metric: Multiply the diameter of the threaded part of the bolt by 1.5 and add 1mm
Ex. 6mm bolt x 1.5 + 1mm = 10mm wrench

Standard: Multiply the diameter of the threaded part of the bolt by 1.5 and add 1/8
Ex. 3/8 bolt x 1.5 + 1/8 = 3/4in wrench
I think your arithmetic in your second example is flawed.

Aside from that, have you checked this guy's suggestion to see how often it comes up with the right answer?

(Edited to add: I see that Jetmugg has already pointed both of these out!)

I haven't verified that what they present is correct, but you might look at these charts for metric and fractional inch information.
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  #5  
Old 03-04-2005, 09:54 PM
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Hey wait a minute!
What exactly constitutes an "old fart"?
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  #6  
Old 03-04-2005, 10:10 PM
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Perhaps another formula is needed, eh?

This old fart has noticed 8mm bolts are most often 13mm across the flats.
So: 8mm x 1.5 = 12mm. Plus 1mm = 13mm.

That sure works on German tin but the Japanese use 8mm bolts that are 12mm between the flats.

So, by the formula>>>>> 10mm X 1.5 = 15mm. Plus 1mm = 16mm.

Oops. most 10mm bolts are either 15mm or 17mm (most common) between the flats.

Hunt the old fart down and inform him that his dog won't hunt.
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  #7  
Old 03-04-2005, 10:13 PM
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Well its too late for any serious thought......but I guess you guys explained why I haven't heard that one before....becasue it doesn't work.
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  #8  
Old 03-04-2005, 10:44 PM
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Remember today because sooner than you think YOU will be the old fart.
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  #9  
Old 03-04-2005, 10:45 PM
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Quote:
Originally Posted by richard u
Remember today because sooner than you think YOU will be the old fart.
I'm 43.........to some people I am an old fart already.
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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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  #10  
Old 03-04-2005, 10:49 PM
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thats funny
I didn't think to even test what he told me or check the math
I made the age old mistake of beliving a crapsman.
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  #11  
Old 03-05-2005, 05:33 AM
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Yeeeesh..........

I'm 46 with 3 kids and 1.5 Grandkids...........

Just broke my left wrist snowmobiling trying to stay young.

So much for wrenching on the MB for a little while.

Stephen (aka Snuzzy Tumblelina)
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  #12  
Old 03-05-2005, 09:41 AM
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Here is another formula for you:

If the difference between 2 numbers is one, the difference between what you get when you put them side by side and then reversing the order is 9

12 and 21
23 and 32
34 and 43
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  #13  
Old 03-05-2005, 11:24 AM
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I may be wrong but wouldn't it be easier to use a caliper to determine the size of nuts and bolts? I am a maintenance mechanic in an alumina plant and come across all kinds of nuts and bolts. I have found out over the years that a caliper in my back pocket will save a lot of trip to the tool box.

This advice from an 'old fart' of 62.
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  #14  
Old 03-07-2005, 12:24 PM
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I have a question.

If you have a bolt in one hand and a ruler in the other what part of the bolt are you going to measure to see what size wrench it takes??

Danny
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  #15  
Old 03-07-2005, 12:34 PM
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Quote:
Originally Posted by dannym
I have a question.

If you have a bolt in one hand and a ruler in the other what part of the bolt are you going to measure to see what size wrench it takes??

Danny
The head across the flats...
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