Spring gasket is used to prevent loosening, such as the motor and the seat connected bolt generally to add spring pad, because the motor vibration if there is no spring pad, the nut will be loose generally with vibration on the equipment on the fastener equipped with spring gasket.Inner tooth elastic gasket, outer tooth elastic gasket: has a lot of sharp elastic warping teeth on the circumference, thorn pressure on the support surface, can prevent the loosening of the fasteners. The inner tooth elastic gasket is used under the screw head where the head is small in size; the outer tooth elastic gasket is mostly used under the bolt head and nut. The elastic gasket with teeth is smaller than the ordinary spring gasket, with uniform force and reliable force to prevent loosening, but it should not be used for regular disassembly. Waveform spring washer: the waveform gasket is divided into WG type, WL type, WN type.1. About price: The price is negotiable. It can be changed according to your quantity or package. 2. About samples: Samples need sample fee, can do freight collect or you pay us the cost in advance. 3. About MOQ: We can adjust it according to your requirement. 4. About exchange: Please email me or chat with me at your convenience. 5. High quality: Using high quality material and establishing a strict quality control system, assigning specific persons in charge of each process of production, from raw material purchase to pack. 6. We offer the best service as we have. Experienced sales team are already to work for you. 7. How can we guarantee quality? Always a pre-production sample before mass production; Always 100% Inspection before shipment; 8. Can I visit your factory? Warmly welcome to visit our factory! 9. We've been persisting in the business essence "Quality First, Honoring Contracts and Standing by Reputations, providing customers with satisfying products and service. " Friends both at home and abroad are warmly welcome to establish everlasting business relations with us. 10. Our mission is "Provide Products with Reliable Quality and Reasonable Prices". We welcome customers from every corner of the world to contact us for future business relationships and achieving mutual success!