Well, I don't know for sure, but it wouldn't surprise me if they are a special off-size.
Benchmade has several automated screw-making machines and they make many of the screws, washer, spacers, pins and other similar parts themselves. Why? Well, with that capacity in-house, their designers don't have to confine themselves to standard parts. This enables them to do things that others can't.
If you're ordering all of your parts from the same catalogs that everyone else does, then don't be surprised if your product looks a lot like everyone else's. If you want to make unique products, you often have to start with unique parts.
Now, of course, Benchmade doesn't jump to custom parts for every little piece just because they can. Even if you own the machine, custom-made parts are never going to be as cheap as standard parts. Besides, the machines have limited capacity. You don't want to overflow that capacity making custom parts to use where standard parts would do.
But, it is possible that the part you need is a special part. Sorry.
BTW, Benchmade also uses a lot of Metric sizes. So, you might check that out too.
Failing that, take 'em to a local machine shop and ask 'em to measure them for you.
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Chuck
Balisongs -- because it don't mean a thing if it ain't got that swing!
http://www.balisongcollector.com
