Autobar 8mm x 20 Fine Thread Bolt & Nylock Nut Twin Pack 2 Pack

Autobar FM278 8mm x 20 Fine Thread Bolt & Nylock NutFine thread has a shallower, tighter thread pitch than the standard coarse thread used on the other bolts in this range, giving a finer adjustment and a larger contact area between the threads. A fine thread bolt needs a nut cut to the same fine pitch, so it will not thread into a standard coarse nut of the same diameter, and a coarse thread bolt will not fit this pack's nut either. The nylock nut supplied has a nylon insert that grips the thread and a locking action that resists working loose under vibration.This pack contains one 8mm, or M8, fine thread bolt measuring 20mm from under the head to the tip, paired with one matching fine thread nylock nut. Since this is a fine thread pairing, check that the fine pitch is what the job specifically calls for, most general fixing jobs use the standard coarse thread bolts also in this range.