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Shakeproof Washers
What are Shakeproof Washers
Shakeproof washers, also known as locking or serrated washers, are designed to help prevent screws, bolts and nuts from loosening due to movement, vibration or repeated use. Our internal toothed washers feature serrations on the inside edge which bite into the mating surface, creating extra grip between the fastener and the surface material to help maintain a secure connection over time. They are commonly installed with threaded components such as bolts, machine screws and nuts where a strong and lasting join is required.
Internal Serrated Washers
Internal serrated washers feature teeth on the inner edge to grip the fastener head, providing strong resistance to loosening while maintaining a neat finish in tighter assembly spaces.
External Serrated Washers
Serrated shakeproof washers use teeth to bite into the mating surface and fastener head, helping to resist loosening caused by vibration. External types offer a larger contact area and stronger grip.
Curved Spring Washers
Curved spring washers are designed to apply a light, flexible spring force within an assembly. They help absorb shock, reduce noise and maintain tension where slight movement or settling may occur.
Wave Washers
Wave washers provide a spring-like load in compact spaces, making them useful for controlling end play, absorbing variation and maintaining pressure in lighter duty fastening and bearing applications.
Conical Seat Washers
Conical seat washers are shaped to improve seating and load distribution under angled or uneven fastening conditions. They are often used to support secure installation where standard flat washers are less suitable.
Spherical Washers
Spherical washers are used alongside matching seats to compensate for misalignment between surfaces. This helps achieve a more even load and secure fit in assemblies where angles are not perfectly flat.
Stainless Steel External Tab Washers
External tab washers feature one or more tabs that can be bent into position to lock a nut or bolt in place. They are commonly used where a more positive anti-rotation fixing method is required.
Stainless Steel Long Tab Washers
Long tab washers provide extended locking tabs that can be folded against a flat edge or fastener face. These are ideal for applications where security and resistance to movement are especially important.
Also referred to as
Key Product Features
High strength stainless steel
Manufactured from a high strength stainless steel for reliable performance.
Recommended for threaded components
Designed for use with bolts, machine screws, nuts and other threaded fixings.
Does not Loosen with vibration or Movement, while maintaining a secure hold.
Sizes and materials
Our shakeproof washer range is available across a variety of materials and metric sizes depending on the product type. This includes serrated washers, spring washers, wave washers, tab washers and other specialist locking washer designs.
Relevant Standards
Shakeproof Washer Size Guide
| Type | Thread Size | External Diameter | Height | Internal Diameter | Material |
|---|---|---|---|---|---|
| Internal Serrated Washers | M2 – M30 | 4.5mm – 300mm | 0.6mm – 3.2mm | 2.34mm – 31.39mm | A2, A4 |
| External Serrated Washers | M2 – M30 | 4.5mm – 48.0mm | 0.6mm – 3.2mm | 2.34mm – 31.39mm | A2, A4 |
| Curved Spring Washers | M2 – M10 | 4.5mm – 18mm | 1.0mm – 4.0mm | 2.2mm – 10.5mm | A2, A4 |
| Wave Washers | M3 – M27 | 8mm – 50mm | 1.6mm – 9.4mm | 3.2mm – 28mm | A2, A4 |
| Conical Seat Washers | M6 – M24 | 12mm – 44mm | 2.8mm – 9.5mm | 7.1mm – 28mm | A2, A4 |
| Spherical Washers | M6 – M30 | 12mm – 56mm | 2.3mm – 11.2mm | 6.4mm – 31mm | A2, A4 |
| External Tab Washers | M4 – M39 | 14mm – 82mm | 0.4mm – 2.0mm | 4.3mm – 40mm | A2, A4 |
| Long Tab Washers | M4 – M39 | 14mm – 82mm | 0.4mm – 2.0mm | 4.3mm – 40mm | A2, A4 |
Engineer's Tip
- Use external serrated washers for higher load applications.
- Ensure clean contact surfaces for proper grip.
- Avoid over tightening — this can flatten the serrations and reduce effectiveness.
Typical Applications
To install on externally threaded components and Holding fasteners in place
Joining two or more parts together
Assemblies where added resistance to loosening is required
Frequently Asked Questions
Need help choosing the right shakeproof washer?
Get in touch with a member of our staff on 01233 713581.
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