DIN and standard parts

Spring washers

Spring washers behave like compression springs and increase the flexibility in a screw connection.

Increasing the flexibility in a screw connection

Spring washers can withstand high pre-tensioning forces

All washers in this category are either wavy, curved or twisted. The components are deformed under load during assembly and react elastically as settling losses occur. This reduces any potential loss of pre-tensioning force.

Method and principle

An overview of spring washers

Working principle

These washers are shaped so that the pre-tensioning force of a screw connection is absorbed elastically. The connection is then secured against potential settling losses.

Material

Steel types with spring properties are usually used as materials for these elements. Other materials are only useful in exceptional cases.

Surfaces

Our products can be coated with different surface finishes, depending on requirements and application. We will be pleased to give you individual advice on the right coating system.

We offer the following surfaces as standard:

Plain
Mechanical Zinc
Zinc plated
ISO Galvanized
Zinc-nickel
Zinc flake

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Types of spring washer

Serrated lock washers
Serrated lock washers have a large number of slightly interlaced metal tabs on the inside or outside.
During assembly, they dig into the surfaces of the clamped components. Due to the many contact points, serrated lock washers also provide excellent electrical contact and are often used for grounding purposes. Serrated lock washers can also be used as a locking element for low-strength screws.

Standards

DIN 6798 A

DIN 6798 I
Spring washers
Spring washers are highly flexible twisted/curved discs with a split at one point.
They are sometimes used as contact elements or for screw locking. Please note that where there is a high loss in pre-tensioning forces, the spring effect of spring washers and serrated lock washers can sometimes cause the connection to come apart completely.

Standards

DIN 127 A

DIN 127 B

DIN 128

DIN 7980

DIN 137 A

DIN 137 B
Spring locking washers
Like disc springs, spring locking washers are conical in shape and are ribbed on both sides.
The ribs bite into the mating face, creating a reliable form fit during assembly, which prevents the connection from loosening. The spring action also counteracts settling losses.

Standards

B 53070
Disc springs
Like conical spring washers, disc springs are slightly conical.
The flexibility of a screw connection is achieved using disc springs. This secures the joint against significant loss of pre-tensioning force. It also reduces the impact of significant settling losses. It is also possible to combine multiple disc springs in order to adjust the flexibility.

Standards

DIN 2093

DIN 6796
Tooth lock washers can be divided into two main categories
Type A: These washers have outward facing teeth

Type I: These washers have inward facing teeth

These components are used primarily to establish electrical contacts when joining coated steel parts. The outward turned edges penetrate the insulating layers to enable a conductive connection. Tooth lock washers can help prevent low-strength screws from working loose.

Standards

DIN 6797 A

DIN 6797 I