elwesso wrote:Thanks for the link Steve. The main deal is if I can get some blanks with the right shaft diameter, I can cut the threads myself on a CNC lathe, its just the tooling to buy everything will be too cost prohibitive.
My buddy has a CNC lathe to do it, but he woudl have to buy the special thread cutters, and a new broach to cut the hex head, as none of the stuff they have there is metric, but spinning threads on some blanks would be cake...
If that's the case, buy the longer bolts, like 60 or 70mm, since only 30ish mm is threaded. Cut the existing threaded portion off, and thread the remaining portion with the correct thread pitch that you need.
Just take caution if you take this approach. The root diameter of some machined bolts is actually smaller than the major diameter of the desired thread. Meaning that there may not be enough material there to cut while leaving a pull depth thread.
Basically, if you want to try this, order a minimum quantity first or call them asking for a sample before commiting a large amount of resources at it.