Fender washer vs Flat washer – Difference explained

The key difference between the fender washer vs flat washer is that for the same inner diameter the fender washer has a larger outer diameter than the flat washer, and thus the fender washer has more bearing surface than the flat washer.

Fender washer vs Flat washer - Difference

Fender washer:

The fender washer is a flat washer with an outer diameter comparatively larger than the inner diameter. For a fender washer, the outer diameter is generally more than 3 times of the inner diameter.

The fender washers have a wider bearing surface that helps to spread the load over the larger surface of the object. Thus it helps to lower the pressure over the object’s surface.

Flat washer:

Flat washers are what everyone thinks about the washer. These are the most used plain circular washers with an appropriate-sized hole at the center.

The basic purpose of using a flat washer is to spread the load over the surface area of the object. Thus it reduces the pressure on the fastened object.

Fender washer vs Flat washer:

Sr. No.Fender washerFlat washer
1The fender washer is a circular washer with an outer diameter larger in comparison with the inner diameter The flat washer is a plain circular disc made from a thin sheet of material with a hole at the center.
2In this washer, the outer diameter is more than 3 times of the inner diameter.In this washer, the outer diameter is generally less than 3 times of inner diameter.
3It has a wider bearing surface.
It has a comparatively less bearing surface.
4The fender washers are suitable for covering the oversize hole.
These are not suitable for oversize holes.
5The wider surface of the washer helps to distribute the load due to the tightening of fasteners over the surface of the object.The fastening load is distributed within less surface area.
6The name of the fender washer arises due to its use for the automobile fender.The flat washer is named on the basis of its appearance as circular and flat.
7It creates less pressure on the object surface due to the fastening load.It creates comparatively more pressure on the surface of the object due to the fastening load.
8It is suitable for the fitting of thin-walled components.
It is not suitable for the fitting of thin-walled components.
9The fender washers are used in sheet metal applications, hanging signboards, plumbing, etc.The flat washers have huge applications in automobiles plumbing, industrial equipment, and much more.
The above table indicates the difference between a fender washer and a flat washer.

FAQs:

  1. How do fender washers differ from flat washers?

    The basic differentiating point between the fender washer and the flat washer is that for the same size the fender washer has a comparatively larger outer diameter than the flat washer.

  2. What is the purpose of using fender washer instead of a flat washer?

    In applications like sheet metal components, due to the large bearing surface, the fender washer applies less pressure onto the machine component than the flat washer.

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