There is also a site that is advertised here on RCU that sells nylon screws and bolts of all sorts and sizes. They announce their products by 'fasteners'. I don't remember the particular URL, but it pops up on a regular basis. They also sell the best servo screws, hex head with a built on washer, hex head type, and the wrench/screwdriver type tool that goes with them. I get both 1/2" and 7/16". I use them for more than just servo's.. hold on cowls, canopes, and anything small that a small screw will work with.

If I see that URl, I will edit this post with it.

I found it.

http://rtlfasteners.com/RC/index.html

Also, as already stated, your local hardware store has a pretty good selection. We have an ACE hardware store nearby and they are pretty well stocked, however, I picked up a pretty good selection of hardware at the WRAM show and from RTL Fasteners on line.

DS.