UnicornForge,
Let me start by saying that I completely understand your concern. The LAST thing I want to do is hurt anyone.
"Scenario : One of the connections fails and the heavy iron ball flys into a group of small children...."
Being a father of two myself, this thought scares me.
Next, this implement is for training purposes only. It will not meet the precise weight specifications that traditional highland games require. In saying that, even though virtually no one will be around, I have definitely searched to find quality hardware to use.
- 3/8" Dia. Oval threaded connectors, ("quick connectors") - workload of 2,200 lbs
- 6" x 1/2" Grade 8 bolt, w/ ultra corrosive resistant coating - min. of 150,000 psi tensile strength
- Eye nut w/ 7/16" diameter loop (to fit 1/2" bolt) - (vertical lift) work load limit of 3,600 lbs