The flange nut "E-Lock Smart Nut" sold by Osaka Forming Co., Ltd. in Japan in January 2013 has been certified by the vibration test of the Shiga Industrial Technology Complex Center and has no loose angle. The inner diameter of the product is specially treated to completely eliminate loose voids, and the price will be 30% higher than the average product. The smart nut vacates a portion of the flange that is not threaded and maintains a distance from the screw to dissipate the stress applied to the screw. This eliminates the load on the screw head during the previous tightening, and also stabilizes the reverse torque during disassembly. A special spring lubricated at the upper end of the nut prevents loosening. Although there are highly anti-loose products in the market, there are already customers on the market who are required to make nuts with a loose angle. This product has been put into mass production. Pipe Sphere,Stainless Less Pipe Sphere,Floating Welded Ball Valve,Stainless Steel Ball Valve Antong Valve Co.,Ltd , https://www.atvalveball.com