Go back and read posting #4.
The op already figured out the diameter, and thread size that's he's needing.
How many of us, that aren't machinists, toolmakers, have a thread gauge in their toolbox, so that's why he posted the question.
And i will state it again, the op can use whatever lock nuts that he can find, purchase.
Remember decades ago, when America actually had trade, high schools, that you could attend.
I went to Kaynor Tech School in Connecticut training to be a machinist - toolmaker, back in the day.
Upon graduation i worked in a factory for more than a year, and said this, (F it) factory work is not what i want the rest of my life.
Joined the Air Force and then maintained F-4 Phantoms, and T-37 Trainers, for 7 years of my enlistments.
So i know all about nuts, and bolts, tensile strength, grading of nuts and bolts, and the op isn't going to have a problem if he bought from Wall Mart, Grainger, McMaster Carr, or any another of internet vendors, new, or used.
