I have seen wires used to captivate bolts. You can also substitute JB Weld for Loctite for a more permanent solution. 

Chris.

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Dnia May 12, 2011 o godz. 22:29 Rocket J Squirrel <camping.elliott@GMAIL.COM> napisał(a):

> Thanks, all. I realized that I can anti-tamper the bolts simply by
> double-nutting them on the farside. They can spin the heads all they
> want but the nuts won't loosen.
> 
> On Thu, 2011-05-12 at 18:44 -0700, Richard Koerner wrote:
> 
>> Obviously, the square, rectangular, or oval shoulders under the head all serve the same primary purpose I would think....anti-rotation to torque.  So, not sure what your needs are, but there are other useful ways to add anti-rotation to a fastener--like pinning with a cross-holes (dowel pin) for example.  Uhh-h-h....maybe even Loctite....depends on what you are doing, materials involved, amount of anti-rotation desired.  Spot-weld?
>> 
>> And I guess you could make your own rectangular shoulder with file and a vise.  But all depends on if you want to make the side of the square longer or shorter, right?!
>> 
>> Also, there may be an option with a third component, like some sort of washer with....a square hole (ID) to fit your bolt but a rectangular feature (OD) to fit your situation.
>> 
>> Need more specific information to solve.  Think outside the box?  Yeah....we do that here.
>> 
>> Rich
>> San Diego
>> 
>> 
>> --- On Thu, 5/12/11, Alistair Bell <albell@SHAW.CA> wrote:
>> 
>> From: Alistair Bell <albell@SHAW.CA>
>> Subject: Re: Modified carriage bolts?
>> To: vanagon@GERRY.VANAGON.COM
>> Date: Thursday, May 12, 2011, 6:21 PM
>> 
>> there is an oval shouldered one in this handy ref doc on my blog
>> 
>> http://shufti.files.wordpress.com/2010/06/jg.pdf
>> 
>> 
>> alistair
>> 
>> 
>> 
>> On 12-May-11, at 6:08 PM, Rocket J Squirrel wrote:
>> 
>>> Carriage bolts have a short square section of shank under the head.
>>> They
>>> are used in square holes.
>>> 
>>> Is there such a thing as a carriage-type bolt that has a rectangular,
>>> rather than square, section under the head?
>>> 
>>> --
>>> Rocky J Squirrel
>>> '84 Westfalia: Mellow Yellow ("The Electrical Banana")
>>> '74 Westrailia: (Ladybug Trailer company, San Juan Capistrano, Calif.)
>>> Bend, OR
>>> KG6RCR