X series
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Nord-Lock X-series washers Product information

A new evolution in bolt security There are two main reasons why bolted joints fail: spontaneous bolt loosening and slackening. Traditionally, application design has involved trying to figure out which will have the biggest effect on the joint and choosing a solution to handle that one problem. It is a difficult compromise to make, especially when both could cause application failure. New challenges call for a new evolution New technologies and demands are creating unique design challenges. Designers need to take into account things such as thick surface coatings to fight corrosion, new...

A new dimension of safety For over 30 years, we have focused on providing the world’s most effective bolt securing solutions. Nord-Lock original washers are recognized around the world for the ability to safely secure bolted joints exposed to severe vibration and dynamic loads. With the next generation of Nord-Lock washers, the X-series adds a new dimension of safety to bolt security. New generation of washers: Unrivaled wedge-effect solution to prevent spontaneous loosening. An exceptional spring effect to compensate for loss of preload due to slackening. Quick and easy to install and...

A true multifunctional solution Take advantage of the world’s most effective wedge-locking concept coupled with a skilfully integrated spring effect for maximum bolt security! Each washer pair has cams on one side and radial teeth on the opposite side to secure the bolted joint with tension instead of friction. The conical shape creates an elastic reserve in the bolted joint to compensate for the loss of preload and prevent slackening. Upon tightening the fastener, the washers flatten and the serrations engage the contact surfaces. Since the cam angle (α) is greater than the thread pitch (...

Proven performance against vibration In addition to the thousands of live tests Nord-Lock personnel perform each year to ensure customer application enjoy secure performance, the various washer properties are rigorously tested by independent organizations. The Junker test, according to DIN 65151, is considered the most severe vibration test for bolt connections. The test exposes the joint to transverse movements underneath the bolted head/nut, while continuously measuring the clamping force. Proven performance against slackening and vibration Solutions available today handle mainly one of...

One solution for all your applications 1. Vibration & dynamic loads In most demanding applications, joints are almost continually subjected to vibration and dynamic loads. The wedge-locking technology in Nord-Lock X-series washers has been proven as the most secure solution to prevent spontaneous bolt loosening in bolted joints for 30 years. 2. Painted or powder-coated surfaces Surface treatments are common for applications that need to be protected from corrosion. Treating or painting a surface with a thick layer before installing a bolt can lead to slackening as the bolt sinks into the...

5. Multiple clamped parts The more parts you clamp together, the more you compound any slackening effect in the bolted joint. Settlement and relaxation are multiplied by each contact surface, as well as other elements such as surface treatments, thermal cycling, and vibration. The combined tension and spring actions in Nord-Lock X-series washers effectively handle all these factors. 6. Gasketed joints All gaskets suffer from continued relaxation after initial tightening. Factors such as thermal cycling, soft metals, and vibration compound the effect. The resulting loss of clamp load can...

Nord-Lock X-series steel washers EN 1.7225 or equivalent, zinc flake coating (Delta Protekt®), through hardened Dimension chart Washer size Bolt size Metric Approx. weight kg     100 pairs / More sizes are in the production phase. Please contact your regional Nord-Lock office for more information. X-series washer material / type guide Steel type Washer types Treatment Surface coating General steel applications Regular outer diameter Through hardened Delta Protekt® base coat (KL100) and top coat (VH302GZ) Corrosion resistance Bolt grades Temperature range Minimum 600 hours in salt spray test...

Torque guidelines Nord-Lock X-series steel washers with zinc flake coating (Delta Protekt®) Nord-Lock X-series steel washers with electro zinc plated bolt grade 5 Cu/C paste, GF =75% µth = 0,11, µb = 0,16 Bolt size Torque [ft-lb] Torque [ft-lb] Torque [ft-lb] Nord-Lock X-series steel washers with non-plated bolt grade 8 Oil, G F =71% µth = 0,13, µb = 0,14 Washer size Bolt size Torque [ft-lb] Cu/C paste = Copper/graphite paste (Molykote® 1000) GF  =   atio of yield point r µth  =   hread friction t µb  =   asher friction w 1 N = 0.225 lb 1 Nm = 0.738 ft-lb Nord-Lock X-series steel washers...

Benefits throughout your application’s lifespan Nord-Lock X-series washers work in distinctive ways to ensure a problem-free lifetime of your bolted joint — from design and installation to operation and maintenance. As a multifunctional solution, Nord-Lock X-series washers save you time and money in the design phase. Simplify design for demanding applications with a single solution that secures against both spontaneous bolt loosening and slackening. Save costs by using one solution for all bolt securing needs. Use the added benefit of Nord-Lock Performance Services to guide you towards the...

Operation Maintenance Beyond the safe locking aspect, Nord-Lock X-series washers also improve the general performance of a bolted joint. ■ Achieve increased operational reliability while significantly reducing the risk of unplanned production stops, accidents, and warranty claims. ■ Invest money and time in profit-generating tasks rather than retightening procedures. Every hour your line is down will cost you, not only in lost production or service, but in labor costs. Nord-Lock X-series washers can generate significant savings for both preventative and reactive maintenance. ■ Decrease...