Nord-Lock washer

Nord-Lock washer from Thomas Potter Ltd

Nord-Lock washers secure bolted joints with tension instead of friction.

The system is comprised of a pair of washers that has cams on one side and radial teeth on the opposite side.

Since the cam angle ‘α’ is greater than the thread pitch ‘β’ a wedge effect is created by the cams, preventing the bolt from rotating loose.

Nord-Lock washers are high end products with documented success in many industries. 

Often joints do not start to loosen until an application is in regular use, therefore Nord-Lock washers are commonly retrofitted during maintenance, repair and overhaul procedures.

Nord-Lock washers are rigorously tested in all steps of production to verify that the quality requirements are met.

Each batch is assigned a control number which ensures full traceability and confirms that the washer is a genuine Nord-Lock article.

The control number is printed on thepackage as well as on every washer pair, enabling full traceability down to first assembly – even when using bin systems for fastener supply.

Available in plated steel, stainless steel and SMO254

Product benefits

• Maintains high clamp load and thereby ensures the function of the joint

• Quick and easy to install and remove with standard tools

• Locking function not affected by lubrication

• Defined and uniform friction conditions which result in a more accurate preload

• Same temperature characteristics as standard bolt / nut

• Reusable – in addition, Nord-Lock washers do not affect the reusability of fasteners

• The washers are hardened and can support and distribute great loads

• Washers with enlarged outer diameter availablefor flanged bolts / nuts

• High corrosion resistance

• Can be used with fasteners up to grade 12.9 (ASTM A574)

• Reliable locking, even for joints with short clamp length

• Secures fasteners at both high and low preloads

• No retightening needed

• Verifiable locking function

• Elegant solution and problem solving – modern engineering


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