X-series Washers

X-series Washers

Nord-Lock Group About Nord-Lock Products X-series Washers Technical Guide

Nord-Lock created the original wedge-locking technology that secures bolted joints, even when exposed to severe vibration and dynamic loads. It is impossible for our products to loosen unintentionally due to the wedge created underneath the bolt head and nut.

Joint Guide

Tapped holes 
Nord-Lock X-series washers safely lock the bolt against the underlying surface. 

Counterbores 
The outer diameter of Nord-Lock X-series washers is designed for counterbore holes (i.e., the washers fit under the head of standard bolts). 

Through-holes
As for all locking washers, through-holes require two pairs of Nord-Lock X-series washers — one pair for securing the bolt and a second pair for securing the nut. 

Stud bolts
Nord-Lock X-series washers safely lock the nut on stud bolts and eliminate the need for adhesives. 

Applications with large / slotted holes
To optimize the load distribution for applications with large/slotted holes, use a flanged nut/bolt together with Nord-Lock X-series “SP” washers with enlarged outer diameter. 

Designs where Nord-Lock X-series washers are not recommended:

  • Mating surfaces that are not locked in place (see left figure)
  • Mating surfaces harder than the washers
  • Wooden mating surfaces
  • Non-preloaded joints 

Selection Guide

Nord-Lock X-series washers are currently available in the following material:

Application parameter: Steel
Steel type: EN 1.7225 or equivalent
Examples of applications: General steel applications
Washer types: Regular outer diameter  
Enlarged outer diameter
Treatment surface coating: Through hardened Delta Protekt® base coat (KL100) and top coat (VH302GZ)
Corrosion resistance: Minimum 1,000 hours in salt spray test (according to IS09227)
Bolt grades: 8.8 and 10.9
Temperature range:

-40°C to 150°C
Temperature recommendations based on information from the raw material supplier. Locking function not affected within the specification.

 

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Customer success stories

Customer Cases How DIY Engineering Founded a Joyous, Century-old Sport The Spiribol game is a result of rudimentary engineering and a profound desire to make a positive social impact for all ages Read more
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Customer Cases Corrosion Resistant Washers Perfect to Secure Marine Fenders Nord-Lock wedge-locking washers provide a secure bolting solution to the South Korean shipping infrastructure, tightening marine fenders braced for impact. Read more
Customer Cases Nord-Lock Group keeps the railway industry on track Nord-Lock wedge-locking washers are used in all safety-related areas of the railway industry, such as bogies, coupling devices, brake systems, rail dampers. Read more
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Customer Cases Putting the X-series to the test The Challenge Wam Metals is a manufacturer and supplier of a wide range of specialized non-ferrous and ferrous components, servicing both the local South African and the international markets. The... Read more
Customer Cases Right on target For over thirty years, Biathlon Target System Kurvinen has been a world-class pioneer in biathlon target and range systems and has exported its products to over 30 countries. During a competition, Kurvinen targets will be continuously shot at and subjected to thousands of hits. Read more
Customer Cases Tough machines for a tough industry In the mining industry, every minute of downtime results in lost income, and one loose fastener can cost a small fortune. This is why Joy Global doesn’t compromise when it comes to bolt security. Read more
Customer Cases Maintaining a tight grip Bolt loosening can occur due to settlement or relaxation of a bolted joint. Nord-Lock X-series washers prove to be solution for Mosdorfer's space dampers. Read more
Customer Cases Competing in the world’s most dangerous race In January 2013, the legendary Dakar Rally started in Peru for the first time and end in Chile, having crossed the Andes into Argentina. Read more
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Customer Cases Good vibrations The huge machines made by Metso Minerals France are a mechanical nightmare. Whereas vibrations are usually eliminated from machines, the very raison d’être of the Metso machines is to vibrate as mu... Read more
Customer Cases Built for Speed The latest version of Japan Railway’s famous Shinkansen, known around the world as the Bullet Train, reaches speeds of 300 kilometres per hour. Read more

Nord-Lock product range

Nord-Lock wedge-locking washers prevent bolt loosening Nord-Lock Nord-Lock Washers Wedge-locking security for bolted joints subjected to extreme vibration and dynamic loads. Read more
Nord-Lock X-series washer combines wedge-locking with an exceptional spring effect to secure against multiple bolt loosening factors Nord-Lock NORD-LOCK® X-SERIES WASHERS Maximum security for critical bolted joints exposed to spontaneous bolt loosening and slackening. Read more
Nord-Lock steel construction washers are designed for bolted connections in steel structures Nord-Lock NORD-LOCK STEEL® CONSTRUCTION WASHERS Optimal contact between bolts and washers used in steel construction applications, including HV and HR sets. Read more
Nord-Lock wheel nuts safely secure wheels on on-road and off-road heavy vehicles Nord-Lock Nord-Lock Wheel Nuts High clamping force that eliminates wheel loosening on heavy vehicles operating under extreme conditions Read more
Combi bolt washers from Nord-Lock are specifically designed to be captivated on a bolt, known as SEMS Nord-Lock Nord-Lock Combi Bolt Washers Additional layer of security for applications through permanent attachment to bolt (SEMS) Read more
Customized washers from Nord-Lock can include special materials, measurements, sizes, coatings or changes in geometry Nord-Lock Nord-Lock Customized Solutions Custom designed bolting solutions for your unique application requirements Read more

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