Hello,

Great reference, thanks. Using this information could a partial thread calculation be made to determine the tapered helix parameters and to accurately place the secondary helix on the bolt cylinder? I know that NSF type stuff specifies this as 3/4" rise per 12" taper, so it's easy to know exactly where the threads are going to leave off cutting the cylinder, but I can't seem to find out the parameters from UTS or ISO Metric. I also can't find the depth of those arcs at the crest and root of the thread, do you have a reference on how to calculate that? Thanks.