1. Titanium nyloc nuts are made out of Gr. 2, Gr.5 and other grades. 2. Titanium made it much lighter than the alloy ones. Titanium nyloc nuts.1.Grade 1, 2, 5, 12 and other grades are available2.UNC, UNF, Metric and DIN are available.3.Custom products available.4.Applied to auto racing, bicycle, motorcycle, chemical, marine, medical and other industries. 5/8" Titanium Nyloc Nuts