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I have a 3/8" bit screwdriver but the bolt I need to unscrew is even bigger than that and TIGHT, so using that screwdriver is starting to strip the screw a bit. I can't find a bigger one anywhere online.

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A picture would be a nice addition to this post. –  Jay Bazuzi Aug 26 '11 at 23:14
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up vote 2 down vote accepted

Here's one from Grainger.

Sounds like you might need to use some frozen-bolt techniques, too (penetrating oil, carefully applied heat, etc.).

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This sounds like a job for a socket wrench. enter image description here

Because a socket wrench has a long handle, it acts like a lever and you can get a huge amount of torque from it, MUCH more than you can get from a screwdriver.

You can get driver bits for those as well, but since you said 'bolt' and it's 1/2", that it will have a hex head on it that you can use a socket bit on.

Using some penetrating oil or WD-40 on the threads may also help to loosen it if it's rusted or corroded.

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It's for a screw that isn't accessible via a socket wrench. It's part of a pump assembly. –  Michael Pryor Aug 26 '11 at 21:06
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Even with an extension bit (you can get them anywhere from 6" to a couple feet long)? I'd need to see a picture before I can provide any more suggestions –  gregmac Aug 27 '11 at 22:52
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