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Zinc Plated Steel 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.

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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.

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Fastener Material Key
A2	A2 Stainless Steel - Also known as grade 304 or 18/8. A general purpose grade of stainless steel.
A4	A4 Stainless Steel - Also known as grade 316 or 18/8/3. A higher corrosion resistant, marine grade of stainless steel.
BZP	Bright Zinc Plated (BZP) Steel - Non-stainless standard steel grade offering a basic level of corrosion resistance.
BZP-TH	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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Fender Washers in Bright Zinc Plated (BZP) Steel

Fender Washers in Bright Zinc Plated (BZP) Steel

Also known as a penny or repair washer, this very popular type offers a large external diameter; it is therefore able to spread the load of the joint over a wider area. This is a useful feature when working with softer materials. Dimensions shown are approximate. Please note that hole clearances can be generous on these washers.

BZP

5/16

SAE Flat Washers in Bright Zinc Plated (BZP) Steel

SAE Flat Washers in Bright Zinc Plated (BZP) Steel

Flat washer to American SAE specifications, now part of the Unified Thread Standard. Washers with a smaller external diameter than that of an equivalent USS washer. Conforms to ASME B18.21.1-1999.

BZP

No.6

No.8

No.10

No.12

5/16

7/16

9/16

1-1/8

1-1/4

1-3/8

1-1/2

USS Flat Washers in Bright Zinc Plated (BZP) Steel

USS Flat Washers in Bright Zinc Plated (BZP) Steel

Flat washer to American USS specifications, now part of the Unified Thread Standard. Washers with an external diameter larger than that of an equivalent SAE washer, but smaller than a penny/fender washer. Conforms to ASME B18.21.1-1999.

BZP

5/16

7/16

Rectangular Section Spring Washers in Bright Zinc Plated (BZP) Steel

image chamfer for Rectangular Section Spring Washers

Rectangular Section Spring Washers in Bright Zinc Plated (BZP) Steel

Spring washer designed to help prevent loosening of bolted joints under vibration. Also know as a Split Lock Washer and a Split Ring Washer. This type has a rectangular section and is manufactured to ASME B18.21.1-1999. Where even distribution of load on the mating surface is the primary requirement an alternative spring washer or a flat washer would be a more suitable solution. In addition Spring Washers do not offer protection for the material being fastened.

BZP

5/16

7/16

9/16

External Serrated Lock Washer in Bright Zinc Plated (BZP) Steel

image chamfer for External Serrated Lock Washer

External Serrated Lock Washer in Bright Zinc Plated (BZP) Steel

A toothed or perforated washer usually employed in electrical connections such as battery terminals, but can also be used in assemblies to help prevent loosening. This variant includes teeth on the external diameter. Produced to ASME B18.21.1.

BZP

5/16

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