GRINDING STONE AND GRINDING APPARATUS INCLUDING CONNECT NUT THEREOF

摘要

PURPOSE: A grindstone and a grinding apparatus including a connecting nut thereof are provided to ensure fast torque since a worn grindstone of 7inch is applied to a 4inch grinding apparatus. CONSTITUTION: A grinding attachment(100) comprises a 4inch grinder(10), a 7inch grindstone(20) and a connecting nut(30). The 7inch grindstone comprises a coupling hole. The 7inch grindstone is worn, and thus is processed as a waste material. The coupling nut is installed between the rotary shaft of the grinder and the coupling hole of the grindstone. The connecting nut connects the grinder the grindstone. One end of the connecting nut is inserted into the coupling hole, and is screwed with the rotary shaft. The other end of the connecting nut is stepped from its one end to cover the coupling hole.