Current：
The Oclas series anti-loosening washers combine the theories of elastic-plastic mechanics and micro-tribology. Through special precision structural design, the core area undergoes extrusion elastic-plastic deformation, forming a mechanical interlock on the outside of the load-bearing nut in the double-nut structure, providing ultra-high loosening resistance torque, greatly improving the loosening threshold of the bolted connection structure, and achieving a perfect combination of excellent anti-loosening performance and reliable fatigue performance.
Oclas series Anti-loosening washers
Application Areas
It is used in various fields with large vibration loads, high anti-loosening requirements and no need for frequent disassembly.
Special "permanent deformation" core structure to achieve super strong anti-loosening performance;
Excellent anti-fatigue performance and long service life;
The assembly process is the same as that of ordinary double nuts, with fool-proof design and easy installation;
Visually judging whether the assembly is in place is more intuitive;
Maintains stable preload under strong vibration load and is maintenance-free;
Be specially customized according to different application scenarios.
Comprehensive performance of the product
For fastened connection structures, only considering the improvement of anti-loosening performance may sacrifice other properties. Generally, the decline of fatigue performance will increase the risk of failure of the connection structure.
An ideal anti-loosening product should combine excellent anti-loosening performance, easy installation, and long service life. Oclas series of anti-loosening washers focus on these characteristics to satisfy our customer.
The relative values of the anti-loosening performance of various products are evaluated by the ratio of the preload reduction in the stable service stage:
Ø The anti-loosening performance of Oclas Series Anti-Loosening Washers is 1.93 times than that of a certain brand of wedge washers
Ø The anti-loosening performance of Oclas Series Anti-Loosening Washers is 2.06 times than that of insert self-locking nuts
Ø The anti-loosening performance of Oclas Series Anti-Loosening Washers is 4.27 times than that of standard double nuts ;
Anti-loosening test results
Bolts using Oclas series anti-loosening washers have significantly better fatigue life than that of ordinary bolts at any fatigue load amplitude. Within the test load range, the fatigue life is improved by approximately 50% to 100%.
The figure below shows the axial fatigue SN curves and detailed test data for a common bolt connection structure and an Oclas series anti-loosening washers connection structure.
SN curve (left) and test data (right) for M12×1.75 common bolts and Oclas series Anti-loosening washers
In scenarios such as pressure vessels and pipelines where there are high requirements for maintaining preload, it is usually required that the preload attenuation under constant load is ≤5% to be qualified. The test results show that Olas series has high preload stability under long-term load, less relaxation tendency, and better preload retention ability.
Verify the bolt's ability to maintain preload during static load service: To install M12 bolts (preload 50kN) by Oclas series Anti-loosening washers and double nuts. Apply a 10kN lateral static load on the testing machine, followed by 100 vibration loads to quickly skip the running-in phase and achieve cross-sectional stability.
Initial preload | Static load 720h preload | Preload retention rate |
48.72kN | 48.49kN | ≥99.5 % |
①Locking nut ②Large one ③Small one ②+③Anti-loosening washers④Load nut ⑤Bolted connections ⑥BoltLock washer installation location (left) Lock washer installation completed (right)
*Note 1: When using this anti-loosening product, there is no need to change the design or selection of the bolts (if the screw length is not enough to install the double nut, the screw length needs to be slightly increased).
*Note 2: The custom development cycle depends on the difficulty of design and manufacturing, and is approximately 8 to 24 weeks.
