TSP Mfg., a WN Global Company (logo)


Wedge-locking security for bolted joints subjected to extreme vibration and dynamic loads.

TSP Manufacturing is Nord-Lock’s preferred distributor to the energy industry offering:


• Prepackaged and custom quantities

• Technical product support


Washer Materials We Stock:


• Delta Protekt®

• Stainless steel

• 254 SMO®


• INCONEL® 718

Nord-Lock Washers


Nord-Lock washers are easy and effective to use while ensuring structural security for applications exposed to vibration and dynamic loads.


Installing the washers

The pre-assembled washers are installed in pairs, cam face to cam face. Lubrication is recommended when possible.



Tighten Nord-Lock washers with standard tools according to the guidelines. Tightening guidelines for other bolt grades are available through our technical representatives.



Untightening Nord-Lock washers is as simple as tightening. Note that since the locking function is not based on increased friction, the untightening torque is generally lower than the tightening torque. Therefore it is not possible to measure offtorque as verification of locking function.


Reusing Nord-Lock

Nord-Lock washers can normally be reused. As with all fasteners, they should be inspected for wear before reassembly. Make sure that the washers are reinstalled correctly cam face to cam face. Nord-Lock recommends lubrication of fasteners before reuse in order to minimize changes in friction conditions.

To order

call or email

our team today




A pair of washers for maximum safety

Nord-Lock bolt securing solutions consist of a pair of washers with cams facing each other and serrations gripping the mating surfaces. They use cam-geometry to effectively prevent the bolt from vibrating loose.


Tension prevents bolts from rotating loose

 Think of the bolt as a spring. Turning the fastener during tightening stretches the bolt like a spring, creating the required clamp load to hold the parts together. Nord-Lock washers secure bolted joints by increasing this clamp load if the bolt tries to rotate loose.

When the fastener is tightened, the cams lock and the serrations on the outer faces of the washers grip into both the fastener and the clamped part, creating clear impression marks in both. Clamping load has been created by the bolt, keeping the assembly locked in place.


Because the cam angle ‘α’ is greater than the thread pitch ‘β’ a wedge-locking effect secures the fastener against rotational loosening, even under the most severe conditions.

When the fastener is untightened, sliding will occur between the two washers. The upper washer is locked to the nut or bolt head by the serrations. The lower washer does not rotate as its serrations are locked into the surface being clamped.


As the cams slide over each other, the clamping load from the bolt is first increased as the bolt stretches, before being released as the cams pass each other.

3303 West 12th Street, Houston, TX 77008

713-230-2500  | info@tsp-mfg.com  |

© 2022 TSP Mfg.



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