YDTech® Precision Rolling Elements (Grade Ⅰ, II, III )for Advanced Drivetrain Systems

As a dedicated manufacturer of high‑performance rolling elements, we combine decades of engineering expertise with state‑of‑the‑art production capabilities. Our core portfolio includes precision needle rollers and, more notably, high‑grade cylindrical rollers in Grades I and II – the benchmark of dimensional accuracy and surface integrity in the bearing industry. Every product we deliver is designed to meet the most demanding requirements of modern mobility and power transmission.

Our cylindrical rollers are manufactured to the strictest international standards, with Grade I and Grade II accuracy classes ensuring diameter tolerances within micrometre ranges. Through advanced centreless grinding, superfinishing, and proprietary heat‑treatment processes, we achieve consistent roundness, straightness, and surface roughness that far exceed general commercial grades. In addition, we offer customised logarithmic crowning profiles to optimise load distribution and reduce edge stress – a critical feature for high‑speed and heavy‑load applications. Our needle rollers, produced in parallel, comply with DIN 5402 and ISO 3096, available in G2 and G3 precision groups, offering low noise and long service life even under oscillating or high‑frequency conditions.

standard sizes of needle rollers pins parts

The true strength of our products lies in their performance under extreme operating conditions. In the automotive sector, our rollers are widely used in automatic transmissions (AT), continuously variable transmissions (CVT), dual‑clutch transmissions (DCT), and electric drive units. They support higher rotational speeds, reduced friction, and improved fuel efficiency – all essential for modern vehicle electrification and downsizing. For high‑speed rail (HSR), our cylindrical rollers are engineered for traction motor bearings, axlebox bearings, and gearbox units that operate at sustained speeds exceeding 300 km/h. The combination of Grade I precision and superior material cleanliness ensures exceptional fatigue life and operational safety, even with sudden acceleration and braking cycles. In transmission systems – both automotive and railway – our rollers contribute to smoother gear shifting, lower vibration levels, and enhanced torque density, directly impacting overall drivetrain reliability and durability.

Technical parameters of needle rollers pins

We operate a fully integrated production line, from raw material inspection to final packaging. Our raw steel is sourced from certified mills and undergoes rigorous ultrasonic and eddy‑current testing to eliminate internal defects. In‑process monitoring includes automated laser micrometres, roundness testers, and surface analysers, with 100% inspection for critical dimensions. Our quality management system is certified to IATF 16949 for automotive and ISO 9001, and we continuously invest in advanced machinery – including CNC grinding centres and superfinishing stations from Germany and Japan – to maintain sub‑micron consistency across large batch volumes. We also provide full traceability, with each lot accompanied by detailed measurement reports and statistical process control (SPC) data, giving our customers complete confidence in every shipment.

chamfer limits of flat ends needle rollers

V-block measurement for roundness of needle rollers