I'm trying to replace a m6 bolt. My new m6 bolt just cannot fit into the old nut, I measured the pitches of the bolts with a caliper, and the pitches are exactly the same.
Originally, I thought all any m6 bolt can fit into a m6 nut. However (and obviously), I'm wrong. I came across an article mentioning that blots have different thread forms ( http://www.roton.com/identify_threads.aspx ). When I looked closely to the threads of my bolts, I found that the thread forms are really different.
I'm just wondering who (or which countries) uses which thread form. Any information is greatly appreciated.
Yours sincerely, Gary