ThePipingMart Blog Fasteners 5 Types of Split Lock Washers

5 Types of Split Lock Washers

Split Lock Washers

Are you planning to make some home improvements or repairs? Perhaps, you need to replace some bolts or screws in your furniture, automobile, or equipment? Then, you may have already encountered the term split lock washer. You may have even discovered that split lock washers come in different types, but you must decide which one to use. No worries, this ultimate guide will help you understand the types of split lock washers and when to use them.

Type I – External-Tooth Lock Washer

This type of split lock washer has teeth on the outside diameter for gripping the surface of the bolt or screw head and on the inside diameter for engaging the surface of the nut or substrate. It’s commonly used in electrical and construction applications concerning vibration and loosening. This type of washer helps prevent the bolt or nut from backing out but may damage the surface that it grips.

Type II – Internal-Tooth Lock Washer

This split lock washer has teeth on the inside diameter for gripping the bolt or screw thread surface and on the outside diameter for engaging the substrate. It’s commonly used in automotive and industrial applications concerning vibration and loosening. This type of washer helps prevent the bolt or screw from backing out but may damage the threads it grips.

Type III – Countersunk Finishing Washer

This type of split lock washer provides a finished appearance to the assembly. It has a cone-shaped reverse side that fits into the countersunk hole and a flat side that sits flush with the surface. It’s commonly used in furniture, appliances, and electronics where aesthetics are a concern. This type of washer does not have locking teeth but may increase the load-bearing surface.

Type IV – Helical Spring Lock Washer

This type of split lock washer has a twisted shape that creates spring tension. It’s commonly used in heavy-duty and high-temperature applications where vibration, loosening, and thermal expansion are concerns. This type of washer provides a continuous grip on the bolt or nut but may lose tension due to fatigue or relaxation.

Type V – Nord-Lock Wedge-Locking Washer

This split lock washer has two wedge-shaped washers that interlock when tightened. It’s commonly used in critical and safety-critical applications where vibration, loosening, and failure are not options. This type of washer provides a permanent grip on the bolt or nut without damaging the surface but may require a unique installation tool.

Conclusion

Now that you know the different types of the split lock washer and their applications, you can choose the right one for your project. Always follow the manufacturer’s instructions on the torque and tightening sequence, and inspect the washer and fastener regularly for wear and damage. Using a suitable split lock washer, you can ensure a secure and reliable connection that can withstand the test of time.

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