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GCSE Design and Technology · key term
A ring-shaped fixing placed beneath a nut or screw head to spread the clamping load over a larger area.
Used by Edexcel and Eduqas
Specification 4.7.3 · Paper 1
A thin ring placed between a nut or bolt head and the surface being fastened to spread the clamping load and help prevent surface damage.
Revise: Fabrication and Assembly MethodsA washer is a thin ring with a hole through its centre. It sits between the nut or bolt head and the surface being fastened. For example, moving along a bolt through a two-part assembly, the order can be bolt head, polymer parts, washer, then nut.
Component 1
Explain a washer's purpose: it spreads the clamping load and helps protect the polymer surface, rather than simply holding the nut in place.
A washer spreads the load; it does not replace the nut or create the fastening by itself.
Do not assume that every adhesive bonds every plastic or that an ordinary spring washer reliably prevents vibration loosening.
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A thin piece placed between a fastener and a surface, commonly to spread the clamping load and reduce surface damage.
A plain washer sits between the fastener and the material surface. Its larger contact area spreads the clamping load, reducing pressure and helping prevent the nut or bolt head from damaging the surface. It can also act as a spacer.
A flat ring placed beneath a fastener head or nut to spread its load over a larger area.
