Eric - I've used those anchors many times and they are made of mild steel. For example, when I set a generator down on them I just give them light taps with a 2# ball peen to get things to line up. If the hole isn't perfect, I've had them pull out when I've tightened the nut. I normally use 1/2" dia. I mean, I cap them with nuts and have still cross threaded them trying to drive them down

The design isn't bad, but those specific anchors won't take a lot of stress. It's the same basic design as the anchors I've used for radio towers, but they might be 15 foot long into solid granite.

jcullom - I looked today but couldn't find it, (we buy what we need and half a tube leftover dries up.)

Here's the place we probably bought the epoxy through:
http://www.williamsform.com/Concrete...e_anchors.html

You can just buy the adhesive without the anchors if you want, although they do have quality fasteners. Some sandstone jobs I do take 2" dia., 40' long anchor rods @150Kps - this is the place we get them. Good site. Scroll down and there's a good design specs page - shows spacing and all the goodies.