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Bolts

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bigbadjohn

09-10-2000 17:55:31




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Can any one tell me why a 3/8 bolt has 9/16 inch head and nut, a 7/16 bolt has a 1/2 inch head,and nut, etc., but a 7/16 bolt has a 5/8 head and an 11/16inch nut?




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Fred OH

09-12-2000 07:21:59




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 Re: bolts in reply to bigbadjohn, 09-10-2000 17:55:31  
Hello All, while we're on the subject, heres one for you. You're heading for a wrench and you say to yourself, "well, it's either 11/16 or 3/4". But if you know what size the threads are, the wrench size is 1 1/2 times the thread diameter. This works on the SAE type bolts except for the 1/4" size. (And everybody can remember that 1/4" uses a 7/16" wrench) Example: 1/2" = 1/2 +1/4 =3/4. 5/8 = 5/8 + 5/16 = 15/16. If your fairly good at math, you can do it in your head on the way to the wrenches. Is this why some people keep their wrenches back in the back of the shop? (grin) If you're working on real old equipment, this might not hold true and of course, probably not true for metric, Lowenhertz or Whitworth. If you got one for metric, we'd like to hear it. L8R----Fred OH

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Lynn Busby

09-12-2000 06:04:09




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 Re: bolts in reply to bigbadjohn, 09-10-2000 17:55:31  
check out this site that was mentioned back in January on YT's site:

www.boltscience.com/pages/info.htm

Maybe it'll help with your questions.



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Grove r

09-11-2000 18:08:20




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 Re: bolts in reply to bigbadjohn, 09-10-2000 17:55:31  
Hi, BBJ, that is a question I have wonderd about for years, just never thought about posting it here. Maybe with a little luck, someone will fill us in, have a gooder and lots of luck....G.



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John Ne.

09-11-2000 21:47:52




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 Re: Re: bolts in reply to Grove r, 09-11-2000 18:08:20  
The answer to this is simple, Meat, more metal for the nut, the smaller bolts will take the torque of fastening, but when you get above 3/4 it goes up proportionally, Used to be everything above 3/8 had a different size nut from the head, an old mechanic told me that was because few guys had second wrenches in the same size, the same reason old combination wrenches are 5/8 and 3/4,,7/8 and 1 , where they skipped a size, so you could work with a wrench in each hand,

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