Shenzhen Xin Herald professional production JB/ZQ4340 / DIN9250 sided tooth lock washers, also known as: toothed disc spring washers, slip washers, tooth lock washer disc spring is a dish improved product quality meets DIN6796 GB / T1972 NFE25-514 standard, tooth lock washer disc spring unique performance is provided by the tooth surface, bolted to solve security problems. Washers and bolts connected, by increasing the friction, resulting in uplift tension, prevent vibration generated after the bolts loose, so as to achieve a 100% lock Material: high quality spring steel (65Mn, 60Si2Mna). Stainless steel (304,316 L). Surface treatment: Black oxide, DACROMET. M3-M36 common specifications with large spot, can be customized non-standard. Quality assurance, integrity management. Welcome to contact us we will provide you with sincere service!