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The Nuts and Bolts of it.

M

MrMark

Member
Most bolts such as 1/4", 5/16", 3/8", 1/2", 5/8" to name a few, have the same size nut as the head of the bolt. Okay, why do 7/16" bolts have a 5/8"
head and an 11/16" nut?!? I have asked quite few mechanics and so on, they always say "that's a good question" but I never get a good answer!
 
I guess that is so you get to use those two oddball wrenches so they wear even with the rest of the set. Otherwise there is a good reason LOL.
 
For bolts bigger than 1/4" diameter, the head is 1 1/2 times the diameter of the bolt except for a slight rounding up in the case of 5/16". In the case of 7/16", the head is rounded down to a 1/16" increment and the nut is rounded up to a 1/16" increment. I feel sure the nut rounding up is to give a little more strength because of the hole in the nut. The bolt head has enough strength because it is all one piece of metal.
 

You must first seek and find inner peace Grasshopper...Only then can you hope to find the answer to your question........
 
I"d disagree about some sizes being the same; seems to me the nut is almost always different from the bolt.

Most nuts sold these days are "Heavy Hex" nuts, they are strong enough for anything they will probably have to handle. Easier than stocking two different sizes of nuts, regular "hex" and "heavy hex".

Think about this, too: You have a standard wrench set - only one wrench per size. How would you tighten a bolt/nut combination where they both needed the same size? With one bigger and one smaller, you use two different wrenches.
 
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