How Our Locknuts Work: Dual-Slotted Technology for Safety-Critical Bolted Joints
Watch our video to see the self-locking mechanism in action. Learn how J.Lanfranco dual-slotted locknuts provide consistent, repeatable torque for safety-critical bolted joints—even under vibration, shock, and impact.
Watch the Mechanism in Action
J.Lanfranco dual-slotted locknuts are engineered for safety-critical bolted joints. In this short video, you can see how depitched threads and dual-slot design provide reliable self-locking torque—even under vibration, shock, and repeated impact.
The Challenge: Reliable Locking Without Damage
In high-stakes assemblies, maintaining clamp force and preventing loosening is essential. Traditional locknuts that distort or deform threads can introduce variability, galling, or even seize—especially in stainless steel applications.
How It Works: Depitched Threads and Dual-Slot Design
Unlike conventional prevailing torque nuts, J.Lanfranco dual-slotted locknuts use depitched threads rather than distorted or deformed threads. This ensures:
- Highly consistent, repeatable locking torque independent of bolt tension
- Preservation of surface treatments and bolt thread integrity
- Reliable performance even in stainless steel, without seizing
Installation Steps
- Free Spin
Free spinning by hand up to 90% of nut height Bolt threads start to expand locking slots located in the turret section of the nut. - Locking Engagement
Locking slots grip the load-bearing thread flanks, applying torque evenly across two opposing planes. - Secure Hold
Once engaged, locking will be effective even with no bolt tension (ideal where low preload is desired). Can be torqued with torque wrench and impact tools. - Uninstall
Uninstall easily without galling or thread damage.
Benefits of Dual-Slotted Locknuts
- No Galling or Thread Damage: Protects both nut and bolt threads.
- Stainless Steel Compatible: Suitable for corrosive or high-temperature environments.
- Repeatable Torque: Ensures predictable performance every installation.
- Durable Under Extreme Conditions: Resistant to vibration, shock, and impact.
J.Lanfranco dual-slotted locknuts deliver confidence in bolted joint reliability, simplifying maintenance and improving safety—even in the most demanding industrial applications.