Crank arm bolts are subjected to some of the most punishing and sustained forces in a mechanical system. They endure constant cyclic stress from rotation and user input, massive shear forces with every power stroke, and repetitive shock loads. A crank bolt failure is not just an operational inconvenience; it can lead to catastrophic damage to the crankshaft or spindle and serious safety risks. Due to the high forces, this is a non-serviceable, structural joint that requires a permanent lock.
Don’t let cyclic fatigue compromise your power train—secure the crank with the toughest chemical anchor.
INCURE Re-Lok™ B72 Red Heavy Duty Threadlocking Adhesive
For critical power-transfer components like crank arms, the fastener must be permanently secured against the highest possible stresses. The INCURE Re-Lok™ B72 Red is a high-strength, anaerobic adhesive engineered to deliver maximum breakaway and prevailing torque, protecting the assembly from failure under extreme cyclic loads.
| Feature & Benefit | Technical Insight for Crank Arm Bolts | Conversion Value |
| High Strength, Permanent Lock | Provides the highest level of security, permanently securing fasteners up to M36 against loosening from high torque and relentless power pulses. | Absolute Reliability: Achieve a non-negotiable bond for the heart of your power train. |
| Superior Shock and Cyclic Resistance | Cures into a solid, rigid plastic that fills all microscopic gaps, effectively damping shock loads and preventing fastener fatigue under constant cyclic stress. | End the Movement: Eliminate all microscopic play, ensuring the bolt remains torqued and the crank arm stays aligned. |
| High Thermal Resistance | Withstands continuous operating temperatures up to 230°C, maintaining stability even with heat generated from friction or adjacent engine components. | All-Condition Stability: Ensures the chemical lock remains robust regardless of operational heat. |
| Contaminant Tolerance | Designed to cure reliably on common metals (steel, aluminum, titanium) even if minor residual surface oil is present. | Reliable Results: Get dependable performance without requiring excessive, time-consuming preparation. |
Application Steps: Securing Crank Arm Bolts for Maximum Power Integrity
Preparation (Mandatory): Due to the high-stress nature of this application, the threads of both the bolts and the receiving bore (crankshaft or spindle) must be meticulously cleaned. Use a wire brush and a heavy-duty degreasing solvent. Ensure all surfaces are perfectly dry and free of old grease or oil.
Application: Apply a continuous, liberal bead of Re-Lok™ B72 Red around the entire circumference of the bolt threads, focusing on the area that will be engaged in the crank spindle.
Assembly: Immediately install the bolt, ensuring the crank arm is fully seated. Using a calibrated torque wrench, tighten the bolt to the manufacturer’s specified value. Do not under-torque, as proper clamping force is essential.
Curing Time (Critical): Allow a full 24 hours for the adhesive to achieve its maximum high-strength and load-resistant cure. The component must not be operated or subjected to power loads until the full cure time is complete.
Stop risking catastrophic mechanical failures and secure your power transfer components with the toughest chemical integrity.