About
About ETM
Eternum Motion Technology was founded in 2002 and is located in Cixi, Ningbo — widely recognized as one of China’s leading regions for bearing manufacturing. With a production facility spanning over 30,000㎡, equipped with advanced automated production lines and precision inspection equipment, we specialize in the manufacture of precision bearings, including miniature bearings and low-noise deep groove ball bearings.
Quality is the foundation of everything we do at ETM. Over the years, we have maintained a strong commitment to building and continuously improving our quality management systems. Through ISO 9001:2015 certification, we ensure product stability and consistency through systematic quality control processes — delivering reliable performance to every customer we serve. Our raw materials and components have also been tested and verified by SGS against the EU RoHS Directive (2002/95/EC) and REACH regulations, meeting the compliance requirements of major global markets.
Our products have earned the trust of customers worldwide, with ETM bearings selected as OEM components by industrial manufacturers — a testament to the precision, reliability, and manufacturing capabilities we deliver batch after batch.
Since our founding, ETM has established strong and lasting partnerships with customers across domestic and international markets. Beyond standard products, our engineering team actively develops customized non-standard bearing solutions, helping clients overcome application-specific challenges that standard products cannot solve.
Looking ahead, ETM remains committed to product innovation and continuous improvement in quality and service — growing alongside our customers and building long-term partnerships for the future.
Our Advantages
Advanced Manufacturing Capability
Eternum operates a modern production facility spanning over 8,000㎡, equipped with fully automated production lines and precision inspection equipment. From raw material intake to finished product delivery, every process runs under a rigorous quality control system — ensuring dimensional accuracy, low noise performance, and consistent quality across every batch, with the capacity to support large-scale, stable supply.
Internationally Certified Quality
Eternum holds ISO 9001:2015 quality management system certification, with raw materials and components SGS-verified for compliance with EU RoHS Directive (2002/95/EC) and REACH regulations. We provide complete compliance documentation for every order, meeting the import requirements of European and North American markets — ensuring smooth customs clearance and a hassle-free sourcing experience.
Trusted by Leading Global Brands
Eternum has been selected as an OEM supply partner by multiple world-renowned industrial brands and top-tier consumer electronics manufacturers. Our production standards, delivery processes, and quality systems have been rigorously audited and continuously validated by these industry leaders — making Eternum a proven, reliable precision manufacturing partner you can depend on for the long term.
OEM Customization & Non-Standard Development
For applications where standard products fall short, Eternum offers a complete OEM customization service — from drawing confirmation and sample production through to full-scale delivery. Over the years, we have successfully developed non-standard bearing solutions for customers across electric motors, agricultural machinery, industrial automation, medical devices, and more, always putting customer requirements at the center of everything we do.
FAQs
What loads can deep groove ball bearings handle?
Deep groove ball bearings are primarily designed for radial loads, but they can also handle moderate axial (thrust) loads in both directions. They are not suitable for heavy axial loads or combined shock loads. In those cases, angular contact or tapered roller bearings are preferred.
How do I select the right bearing size for my application?
Selection should be based on bore diameter (shaft size), required load capacity (dynamic rating C and static rating C0), operating speed compared with the bearing limiting speed, available space (outer diameter and width), and required precision grade from P0 to P2. Always apply a safety factor and verify that the calculated L10 service life meets your requirements.
What is the difference between open, shielded (ZZ), and sealed (2RS) bearings?
Open: No built-in protection, requires external sealing, and is suitable for clean environments or oil bath lubrication.
ZZ metal shields: Protect against dust and debris with low friction, making them suitable for high-speed applications, but they are not waterproof.
2RS rubber seals: Provide strong protection against dust and moisture. They are pre-greased and ideal for contaminated environments, but generate slightly more friction.
How often should I lubricate or replace the grease?
For general industrial use, grease should be replenished or replaced every 3,000 to 10,000 operating hours depending on speed, temperature, and environmental conditions. Bearings running above 70 C or in contaminated environments require shorter intervals. Sealed 2RS bearings are pre-greased for life and do not require re-lubrication.
What are the common causes of premature bearing failure?
The most frequent causes include inadequate or improper lubrication, contamination by dirt, dust, or moisture, incorrect installation, misalignment, excessive force during fitting, overloading beyond the rated capacity, improper shaft or housing fits, and fatigue at the end of normal service life.
How is the rated service life (L10) of a bearing calculated?
The basic L10 life is calculated as L10 = (C / P)^3 x 10^6 revolutions, where C is the dynamic load rating in kN and P is the equivalent dynamic bearing load in kN. It represents the number of revolutions that 90% of identical bearings will complete without fatigue failure. In practice, ISO 281 modified life calculations also apply correction factors for lubrication, contamination, material, and reliability.
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ETERNUM MOTION TECHNOLOGY