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sigmapit fasteners: Anti-loosening washers are a type of fastener with a flat, ring-like shape. Placed between the bearing surface of a bolt, screw, or nut and the surface of the connected part, they increase the contact area, reduce pressure per unit area, and protect the connected part's surface from damage. Another type, elastic washers, also prevents nuts from loosening. The anti-loosening washer consists of two pieces. Its unique embedded structure changes the traditional method of relying mainly on friction for locking, instead employing the most advanced international anti-loosening technology, utilizing the tension between the two washers to achieve dual effects of anti-loosening and locking. It prevents loosening caused by vibration and dynamic loads, is easy to disassemble, and the loosening torque is greater than the tightening torque; the locking effect is not affected by lubrication, and increased lubrication improves the anti-loosening effect; it has the same temperature characteristics as standard bolts/nuts; and can be reused a limited number of times.

sigmapit fasteners functions

Anti-loosening washers bring convenience to the mechanical industry by preventing thread loosening. There are many varieties of anti-loosening washers, including butterfly washers, saddle washers, spring washers, and wave spring washers, collectively known as anti-loosening washers. These types rely on increasing static friction to achieve anti-loosening effects, which meets enterprise needs under conditions of low vibration, light load, and uniform speed. However, under strong vibration, high load, and rapid motion, they do not achieve complete anti-loosening, merely extending the time before the nut and bolt self-loosen. This breaks away from the traditional method of increasing "preload" and enhancing "friction" for anti-loosening. The latest anti-loosening principle is applied not only in washers but also in nuts and bolts, solving the problem of fastener loosening in heavy industry enterprises and eliminating the need to reference tightening and loosening torques during installation.

sigmapit fasteners installation requirements

Anti-loosening washers are characterized by simple installation. Simply place the two washers with their inner inclined tooth surfaces facing each other between the nut and the connected material. After the nut is tightened, the outer radial cam surface of the anti-loosening washer bites into the contact surfaces at both ends, and the angle of the inner inclined tooth surface is greater than the thread angle of the bolt. When the bolt is elongated due to mechanical vibration, the nut tends to rotate and loosen. Since the friction on the outer radial cam surface is greater than that between the inner inclined tooth surfaces, in this state, only relative movement between the inner inclined tooth surfaces is allowed, generating a certain lifting tension. When the bolt contracts, the inclined tooth surfaces of the washer return the nut to its original position, thereby achieving 108% anti-loosening and locking effects. The washers are suitable for relatively flat and smooth surfaces. If the connected material is non-metallic, a metal plate can be fixed to the connected material to allow the use of anti-loosening washers.

sigmapit fasteners applications

Due to different environments, the material requirements for anti-loosening washers vary. They are characterized by a wide variety of specifications, diverse performance and uses, and a high degree of standardization, serialization, and generalization. Some refer to anti-loosening washers that meet national standards as standard fasteners or simply standard parts. Stainless steel anti-loosening washers have inherent corrosion resistance; when the surface is damaged, a thin oxide layer forms to prevent further rusting. Typically, the sequence of blocking, shearing, adhering, and locking occurs within seconds, so correct understanding and use of these fasteners are essential to prevent this phenomenon. Anti-loosening washers are suitable for equipment subject to frequent vibration, such as in the automotive industry, compressors, construction, wind power generation equipment, agricultural machinery, casting industry, drilling equipment, shipbuilding industry, mining equipment, oil drilling rigs (onshore or offshore), public utilities, rail transit, transmission systems, and metallurgical equipment.

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