On Mon, May 17, 2004 at 12:53:05PM -0300, Bob Crinion wrote: > What does 5/8-11 NC and 5/8-18 NC indicate? "5/8" indicates the diameter. "-11" is eleven threads per inch. "-18" is eighteen threads per inch. Both of these are apparently considered "National Coarse", as that's what "NC" means. - George 1084811779.0