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Tool Talk Discussion Forum

Screw question

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vrickster

02-13-2005 15:46:03




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What is the difference between a hex bolt and a hex head cap screw?




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Johnski

02-14-2005 14:01:36




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 Re: Screw question in reply to vrickster, 02-13-2005 15:46:03  
If you look closely a capscrew has a small washer like collar machined just under the hex head and a bolt does not. I believe that the threads are a better class of fit than a bolt. JF



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led

02-13-2005 19:01:05




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 Re: off discussion Screw question in reply to vrickster, 02-13-2005 15:46:03  
Rod NH- How do you post OLD GLORY with your name?

We were winning in 68 when I left.

Led



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Rod (NH)

02-13-2005 19:51:05




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 Re: off discussion Screw question in reply to led, 02-13-2005 19:01:05  
Hi Led,

Thank you for your service to this great country!

It easy once you know how and get the hang of it. The picture is a small .gif file named flag.gif. It's small (20x13 pixels) in order to fit in well with the standard text size. It's located in one of the directories on my home page. You can grab a copy of it if you like. Just right click on it below and select "save picture as" to get it saved on your hard disc. You will then need some place on the web to put it - some server that is always connected and will permit direct linking. My home page is located on my Internet Service Provider's web server so the picture is available at all times.

Once you have the picture available on a web server somewhere, you need to provide the correct html coding in your message box so that it shows up in the right place. For example, the coding for my signature in my post below looks similar to this:
[img src="http://www.worldpath.net/~thompson/acb/flag.gif"] Rod
If you just replace the [ with < a rel="nofollow"nd the ] with >, the whole thing actually shows up like this, after it is posted:
third party image Rod
The address between the double quotes is the internet location (URL) of the flag picture.

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led

02-14-2005 21:03:10




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 Re: off discussion Screw question in reply to Rod (NH), 02-13-2005 19:51:05  
Thanks Rod

Led



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rRedmud

02-13-2005 18:19:50




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 Re: Screw question in reply to vrickster, 02-13-2005 15:46:03  
Bolts and cap screws come in all grades. They come in all metals, even plastic.



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jackbrit3

02-13-2005 18:11:26




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 Re: Screw question in reply to vrickster, 02-13-2005 15:46:03  
I think cap screws are often grade 12 where a hex bolt is usually grade 3,5,or 8



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Redmud

02-13-2005 18:10:28




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 Re: Screw question in reply to vrickster, 02-13-2005 15:46:03  
Have you ever needed a 5/16 lock washer and none to be found? then spot a 5/16 bolt with a lock washer and you can't get the lock washer off the bolt. well, that 5/16 bolt is really a cap screw. cap screws and bolts CAN look the same. Hex, allen, come in bolts or cap screws. you can use a cap screw in place of a bolt, but not a bolt in place of a cap screw... I think I got that right..



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old

02-13-2005 17:09:45




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 Re: Screw question in reply to vrickster, 02-13-2005 15:46:03  
The term screw refers to something that is screwed in to some thing like wood, sheet metal, and makes its own treads as it is put in. A bolt goes in to a nut and or a hole that treads or made/tap in to. Also the bevel of a screw is greater then that of a bolt.



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farmerbill in ny

02-13-2005 16:56:57




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 Re: Screw question in reply to vrickster, 02-13-2005 15:46:03  
cap screws need a allen wrench to install/remove,hex heads need a open end/box wrench or socket.



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Weirsdale George

02-13-2005 17:10:14




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 Re: Screw question in reply to farmerbill in ny, 02-13-2005 16:56:57  
I have always heard the term "socket head cap screw" used when a Allen wrench is needed to install/remove.



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Rod (NH)

02-13-2005 16:53:03




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 Re: Screw question in reply to vrickster, 02-13-2005 15:46:03  
Hi,

For most practical purposes the difference is only sematics. However, there is a specific difference. The hex head bolt has a maximum basic body diameter slightly greater than the nominal diameter. The hex head cap screw has a maximum basic body diameter equal to the nominal diameter. For example: a 1/2-13 hex head bolt can have a body dia beneath the head of up 0.515". A 1/2-13 hex head cap screw would have a maximum body dia beneath the head of 0.500". See American National Standard ANSI B18.2.1.

third party image Rod

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J. Schwiebert

02-14-2005 04:52:37




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 Re: Screw question in reply to Rod (NH), 02-13-2005 16:53:03  
Where can I get a copy of the ANSI standards/



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Rod (NH)

02-14-2005 09:24:46




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 Re: Screw question in reply to J. Schwiebert, 02-14-2005 04:52:37  
I don't know where you get any for free. Most of the technical standards agencies only make their standards available for sale, usually at a pretty hefty price. The older copy of B18.2.1 that I have came from a previous employer. You can try a Google search on "ANSI Standards" to review possible sources as I don't have any specific one in mind - I believe there are several companies that specialize in selling technical standards/codes from various agencies/societies/institutes.

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BobMo

02-14-2005 07:18:03




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 Re: Screw question in reply to J. Schwiebert, 02-14-2005 04:52:37  
Go to their web site..... .....



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