J-System DIN125A zinc-plated M2, 2.2 x 5 x 0.3 washer 140HV

On this page you can see the details of the ring. Below, you can read what these details mean and what to consider before ordering.

What the dimensions 2.2 x 5 x 0.3 mm mean

The three numbers stand for the inner diameter, the outer diameter and the thickness. The inner diameter of 2.2 mm is slightly larger than the thread of an M2 bolt, so the bolt passes through without binding. The outer diameter of 5 mm determines the size of the bearing surface the washer provides under the bolt head or nut. The thickness of 0.3 mm makes this a very thin washer, which adds little height to the connection.

What a washer is used for

A washer spreads the pressure of the bolt head or nut over a larger surface. This means the bolt presses less into the material and the surface stays intact. This is especially useful with soft or thin materials. Note, however: a standard flat washer like this one is not a locking device. If you want to secure a connection against loosening due to vibration, you need a separate locking method, such as a spring washer or a lock nut.

Galvanised and 140 HV: what does that mean

ZN stands for a zinc coating on the steel. That layer protects the metal against rust under normal conditions, for example indoors. For an environment with a lot of moisture or outdoor use, it is better to check whether galvanised is sufficient or whether a stainless steel variant is a better fit. The value 140 HV is the hardness according to the Vickers scale and applies to the standard version of this washer.

Check whether the washer fits your connection

First check the thread size of your bolt or screw: this washer is intended for M2. Then check whether the outer diameter of 5 mm fits the available space, for example in a recess or against an edge. Also consider the overall build-up: a thin washer of 0.3 mm hardly changes the clamping length, but with a short bolt every tenth of a millimetre can count.

Frequently asked questions

Which bolt does this washer fit?

For a bolt or screw with an M2 thread size. The inner diameter of 2.2 mm lets the bolt pass through easily.

Is this washer suitable for securing a connection?

No. A flat washer to DIN 125 A mainly distributes pressure. To secure against vibration, you need a different method, such as a spring washer or lock nut.

What does ZN mean in the product name?

ZN stands for galvanised. The steel has a zinc coating that prevents rust under normal use.