Help, Having some problem in cutting a simple 3/8 16 tpi thread on a rod. I have turned the rod to 3/8 diameter but trying to cut the thread using a die the amount of force I think is excessive. So I have searched the web to see if there are any dimensions as to the external diameter for cutting external threads but can find none, lots of tapping drill sizes but no external sizes.
When I have cut threads before I do not remember the force required being so high or am I just getting weaker!!