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Imperial Washers

A washer can spread the load that a nut, bolt or screw head will apply to a surface and serve to keep the assembly from loosening. There are many types of imperial washers which are designed to add various qualities to the fixing point of the assembly.

Our range of imperial washers are available in a variety of materials appropriate for their intended purpose. Usually the same material is used for nut, bolt and washer. This will ensure that, particularly in damp, wet or salty environments, galvanic corrosion is minimised.

The internal diameter of the washer will always be slightly larger than the nominal diameter of the bolt. Within some ranges of imperial washers the clearance between bolt and washer will be significant. The nominal diameter is generally shown in fractions of an inch for 1/4 inch or larger washers. Nominal diameter bolts and nuts, and occasionally washers, smaller than 1/4 inch, are expressed in gauge size.

The data sheets for each washer type will also give you the external diameter and the thickness of the washer in decimal inches.

Fastener Material Key
A2 Stainless Steel - Also known as grade 304 or 18/8. A general purpose grade of stainless steel.
A4 Stainless Steel - Also known as grade 316 or 18/8/3. A higher corrosion resistant, marine grade of stainless steel.
Bright Zinc Plated (BZP) Steel - Non-stainless standard steel grade offering a basic level of corrosion resistance.
Through (Thru) Hardened Bright Zinc Plated Steel - Carburised or through hardened washer in Bright Zinc Plate finish that has been treated to improve strength.


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