Can anyone please tell me what a 'saddle key' is? Thanks?

Answer 1

I found this on the internet:
"A Saddle Key has three sides that are square to each other and the last surface has a curvature or radius. ... ... A saddle key is used in low-load requirements."
http://www.engineersedge.com/Edge_disc3/0000007e.htm

I really can't pretend to understand this! Beyond the fact that it seems to be some mechanical engineering hardware.

The other thing I'm finding is key rings or key chains with designs of saddles on them or shaped like saddles.

Hang on, this is what Wikipedia says about it in German:
It's a part of a machine in mechanical engineering which connects shaft and hub. There are different types of this part of the machine, and a saddle key is one type. What's special about the saddle key is that it makes do without a nut in the shaft.
I hope I'm getting the words right!
http://de.wikipedia.org/wiki/Einlegekeil

I think you should post your question in the "Engineering" category (you find that listed under "Science and Mathematics") - to get some answers by people who understand what they're talking about! :)