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What is the classification of the anti-loosening method of serrated safety washers?

Author: Hou

May. 23, 2022

266 0 0

Tags: Hardware

Serrated washers, also called lock tooth washers, have teeth that bite into fasteners and base plates. The teeth will prevent the fasteners from loosening, but will leave scratches on the surface. The inner lock washer can leave a cleaner surface. Browse the inner and outer serrated washers below.Serrated safety washers increase the friction between the bolt head/nut and the mating surface. They do this by clinging to the mating surface. Serrated lock washers are installed between the bolt head/nut and the mating surface. Then tighten the bolt joints in the same way as the unfastened bolts.If the bolted joint experiences a loss of tension, the washer is no longer effective and must be replaced.Single part serrated washers can damage painted/coated surfaces because they have a tendency to rotate with the fastener. This risks damaging the surface, cracking the paint/coating and causing corrosion.  

There are three basic types of anti-loosening methods for serrated safety washers:


1. Non-detachable anti-loose

This is an anti-loosening method that changes the detachable threaded connection to the non-detachable threaded connection by welding, bonding or punching riveting, etc. It is a very reliable traditional anti-loosing method. The disadvantage is that threaded fasteners cannot be reused. And the operation is troublesome. It is often used in some important occasions that require anti-loose and high reliability without disassembly.

2. Anti-loosening of mechanical fasteners

The mechanical fixing part is used to fix and pin between the threaded part and the connected part or between the threaded part and the threaded part to prevent loosening. The advantage of this method is its anti-loosening reliability, and its anti-loosing reliability generally depends on the static strength or fatigue strength of the mechanical fixing parts (or the fasteners themselves, such as slotted nuts). Its disadvantage is that it increases the weight of the fastening connection, is troublesome to manufacture and install, and cannot be installed by motor, so the cost is relatively high. Because of its high reliability, it is still widely used in some important parts of mechanical products and aerospace products. ?

3. Anti-loosening to increase friction

Use the method of increasing the friction between the threads or between the bolt (screw) head and the end face of the nut or both at the same time to achieve the purpose of anti-loosening. This anti-loosening method is less reliable than the above-mentioned type a or type b methods, but its biggest advantage is that it is not limited by the use of space, can be repeatedly assembled and disassembled many times, and can be assembled by mobile, and some of them Fasteners (such as nylon ring lock nuts, all-metal lock nuts), its anti-loosening reliability has reached a very high level. Therefore, this anti-loosening method is the most widely used in the machinery manufacturing sector and the aerospace field.





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