In many industrial structures, the biggest problem with bolted connections is automatic loosening under the influence of vibrations and dynamic loads. In such conditions, classic solutions – spring washers or thread adhesives – do not always provide an adequate level of safety.

One of the most effective ways to secure your connection is Nord-Lock wedge washers, which use a locking mechanism instead of friction. This ensures the connection remains stable even under strong vibrations and varying loads.

Nord-Lock washers

Nord-Lock washers are self-locking locking washers used to secure bolted connections.

They consist of pairs of washers with wedge surfaces, which block the rotation of a screw or nut. The mechanism works on the principle wedging instead of friction, thanks to which the connection does not loosen even when subjected to vibrations.

They are most often used in:

• steel structures

• industrial machines

• energy installations

• photovoltaics

• transport industry

The most important advantages of Nord-Lock washers

Effective protection against loosening

The pads use wedging mechanism, which increases the preload in the joint instead of relying solely on friction.

Thanks to this:

• the connection does not loosen under the influence of vibrations

• the clamping force is maintained

• the safety of the structure increases.

  Independence from lubrication

  In many security systems, the presence of grease can reduce locking effectiveness.

  In the case of Nord-Lock washers lubrication does not affect the operation of the wedge mechanism, therefore they can be used in a wide range of operating conditions.

  High resistance to dynamic loads

  Nord-Lock washers are used in applications where:

  • vibrations,

  • variable loads,

  • dynamic movement of elements.

  That is why they are often used in heavy industry, energy and railways.

How do Nord-Lock washers work?

The Nord-Lock system consists of two identical washers, which have:

• radial teeth on the outer side,

• wedge surfaces on the inner side.

When tightening the screw:

1. the teeth lock the washers against the surface of the element,

2. wedge-shaped surfaces work together,

3. a self-wedging effect is created.

In order for the connection to come loose, it would be necessary overcoming the wedge angle, which is greater than the thread pitch. In practice, this means that the loosening torque is greater than the tightening torque, which effectively prevents loosening.

Types of Nord-Lock washers available at Eurobolt

Eurobolt offers several variants of Nord-Lock washers suited to different applications:

1. Nord-Lock S EB 88132 – standard self-locking washers

• Made of high-quality A4 steel and coated with a protective zinc flake coating, which increases corrosion resistance and extends service life. EB 88132 S

2. Nord-Lock SP EB 88132 – widened washers

• They provide better load distribution over a larger surface, which is particularly useful for connections in large openings or on soft surfaces. EB 88132 SP

3. Nord-Lock SP X-Series EB 88132 – premium widened washers

• SP version in hardened steel with zinc plating; ideal for connections subject to intense vibrations and where the highest reliability is required. EB 88132 SP X

4. Nord-Lock SC EB 88132 – HV screw washers

• Designed for high-strength HV screws – made of hardened steel and coated with zinc flake, intended for particularly demanding applications. EB 88132 SC

5. Nord-Lock X-Series EB 88132 – classic X-Series

• X-Series washers offer a high level of security for standard applications and are available in a variety of materials and coatings. EB 88132 X

Application of Nord-Lock washers

Wedge washers are used wherever a bolted connection must remain stable for a long time.

Most common uses:

• steel structures and production halls

• industrial machines

• energy installations

• photovoltaics

• flange connections

• flanges and pressure connections

• transport infrastructure

Why use Nord-Lock washers?

Nord-Lock washers ensure a high level of security of bolted connections thanks to the wedge locking mechanism.

Unlike traditional washers, their operation is not dependent on friction, which allows the connection to remain stable even under strong vibrations and variable loads.

This solution is particularly appreciated in industrial applications, where connection failure can lead to costly downtime or damage to the installation.

 

Why buy Nord-Lock washers at Eurobolt?

Deciding on pads Nord-Lock on offer Eurobolt, you choose proven solutions from a world leader in securing bolted connections, available from an experienced and specialized distributor. Eurobolt offers exclusively original Nord-Lock washers, compliant with standards, certified and intended for applications where connection security is crucial.

When you buy from Eurobolt, you gain access to a wide range of Nord-Lock washers variantsThis allows for precise product selection for specific applications, loads, and environmental conditions, such as vibration, temperature fluctuations, and exposure to corrosion.

Another important advantage of Eurobolt is professional technical advice and efficient logistics, which translates into fast order fulfillment and support during the design and assembly stages. All this means that by choosing Nord-Lock washers from Eurobolt, you're investing in reliability, durability and safety of screw connections, without compromising quality.

Check out Nord-Lock washers at Eurobolt

If you need effective security for bolted connections, Nord-Lock washers are one of the most reliable solutions used in the industry.

Check out the available variants in Eurobolt offer and select the appropriate type of pads for your application.