Precision Machined Bearing Rings Technical Specifications
| Ring Types | Inner Rings, Outer Rings, Tapered Roller Cups/Cones, Hub Bearing Units |
|---|---|
| Primary Equipment | Star CNC Swiss-type Lathes, 4-axis CNC Machining Centers, Cylindrical Grinders |
| Dimensional Tolerance | Bore & Outer Diameters: ±0.002mm; Width: ±0.01mm |
| Geometric Tolerances | Roundness: 0.001mm; Concentricity (Bore to O.D.): 0.003mm; Runout: 0.002mm |
| Common Materials | GCr15 (AISI 52100), SUJ2, 42CrMo, SUS440C, SUS304 |
| Heat Treatment | Through Hardening, Induction Hardening (HRC 58-62 on raceway) |
| Surface Roughness (Ra) | Ground Raceways: Ra 0.05 - Ra 0.2; Turned Surfaces: Ra 0.8 |
| Machining Features | Tapered/Profiled Raceways, Seal Grooves, Snap Ring Grooves, Counterbores |
| Surface Treatments & Cleaning | Phosphating, Black Oxide, Ultrasonic Cleaning, Anti-rust Oil Coating |
| Inspection Equipment | Japanese/German Roundness Testers, Profilometers, CMM, Hardness Testers |
Ultra-Precision Machined Bearing Rings for High-Speed Rotary Applications
At Xierge Precision Machinery Co., Ltd., we leverage over 30 years of operational experience since 1990 to manufacture premium Precision Machined Bearing Rings for the automotive, industrial machinery, and medical sectors. Bearing rings—including inner rings, outer rings, and tapered roller bearing cups—act as the foundational load-bearing elements in rotary systems. They demand extreme geometric precision, flawless raceway profiles, and superior surface finishes to ensure smooth high-speed rotation, minimal friction, and extended fatigue life. Even a microscopic deviation in raceway roundness or wall thickness can lead to uneven load distribution, excessive vibration, and premature bearing failure.
To achieve flawless results, our state-of-the-art facility is equipped with Japanese imported Star CNC Swiss-type lathes, advanced 4-axis CNC machining centers, and high-precision internal/external cylindrical grinders. This specialized equipment allows us to machine complex raceway geometries, precision sealing grooves, and multi-step profiles in highly rigid setups. Our advanced grinding capabilities enable us to achieve mirror-like finishes on the raceways, ensuring optimal rolling contact. We also utilize dedicated industrial cleaning machines to completely eliminate micro-debris from the porous grinding surfaces.
Following our core principle of "Integrity Oriented, Quality Foremost," we strictly adopt premium raw materials, such as GCr15 (AISI 52100) and SUJ2 bearing steel. To guarantee reliable product performance, we apply strict quality inspection protocols utilizing a complete set of testing instruments imported directly from Japan and Germany, verifying raceway profiles, roundness, and structural hardness. We keep innovating to maintain sound business development and warmly welcome domestic and overseas clients to visit our factory and explore custom OEM/ODM cooperation opportunities.
Core Advantages of Xierge Precision Machined Bearing Rings
- Ultra-Precision Raceway Grinding: Our high-precision CNC cylindrical and internal grinders allow us to achieve mirror-like finishes (Ra 0.05 - 0.2) on raceways, significantly reducing rolling friction and extending bearing lifespan.
- Extreme Roundness Control: We utilize advanced single-point turning and grinding techniques to maintain strict roundness tolerances (down to 0.001mm), preventing high-speed vibration and ensuring smooth rotation.
- High-Strength Bearing Steel Mastery: We have mature processing parameters for GCr15 and SUJ2, preventing thermal micro-warping and ensuring optimal hardness (HRC 58-62) for superior fatigue resistance.
- Complex Profile Machining: Our 4-axis CNC machining centers enable the precise milling of complex seal grooves, snap ring channels, and tapered profiles in a single, rigid setup.
- Thermal Deformation Correction: For hardened rings, we meticulously manage the quenching process and utilize precision grinding post-treatment to correct any ovalization, restoring exact geometric tolerances.
- Advanced Micro-Debris Removal: To prevent abrasive wear during operation, all rings pass through dedicated industrial ultrasonic cleaning machines to completely eliminate grinding dust and micro-chips from the raceways.
- 3-Decade OEM/ODM Innovation: Since 1990, we have continuously innovated, collaborating closely with clients to optimize DFM (Design for Manufacturing) for custom bearing rings, scaling seamlessly from prototyping to mass production.
Payment Methods & Global Logistics Solutions
Secure International Payment Terms:
To facilitate smooth B2B international trade, we offer flexible and secure payment options. For mass production orders of precision machined bearing rings, we accept standard T/T (Telegraphic Transfer) with a 30% advance deposit and 70% balance before shipment. For large-scale automotive or industrial supply contracts, we are fully capable of processing Irrevocable Letters of Credit (L/C) at sight. For initial prototyping, sample orders, or custom tooling fees, PayPal and Western Union are also available to expedite the process.
Global Logistics & Protective Packaging:
We provide comprehensive end-to-end shipping solutions under FOB, CIF, and DAP Incoterms. For urgent prototypes or small batches, we utilize expedited international couriers such as DHL, FedEx, and UPS. For bulk mass production, we offer highly competitive sea freight (LCL/FCL) and air cargo rates through our trusted global forwarder network. Recognizing that bearing rings have flawless ground raceways and precise bores highly susceptible to impact, pitting, and oxidation, we utilize specialized packaging: each ring is individually coated in heavy anti-rust oil, wrapped in VCI (Volatile Corrosion Inhibitor) paper, secured in custom partitioned blister trays or EPE foam slots to prevent ring-to-ring contact, and packed in sturdy export-grade cartons or wooden cases to ensure zero damage during international transit.
FAQ
Thin-walled rings are highly susceptible to clamping deformation. We utilize specialized soft jaws, elastic collets, and magnetic chucks that distribute clamping force evenly without distorting the ring. For finishing operations, we rely on precision grinding rather than turning, which removes material with minimal radial pressure, ensuring the final geometry meets strict roundness tolerances.
Heat treatment naturally causes slight dimensional shifts in bearing rings. We account for this by leaving a precise grinding allowance before hardening. After quenching and tempering, we utilize CNC internal and external cylindrical grinders to systematically remove the deformed layer. This post-treatment grinding perfectly restores the bore, outer diameter, and raceway profiles to exact micro-tolerances.
Standard metrology tools cannot accurately assess bearing raceways. We utilize imported Japanese and German precision roundness testers and specialized bearing profilometers. These instruments physically trace the raceway cross-section to map the radial runout, waviness, and surface roughness, ensuring the profile meets ISO or ABMA standards for high-speed applications.
Yes. Our 4-axis CNC machining centers and Star CNC Swiss-type lathes are fully equipped with live tooling. This allows us to precisely machine complex seal grooves, anti-rotation notches, and stepped counterbores in a single setup, ensuring perfect concentricity with the main raceway and reducing overall lead times.
Residual abrasive dust acts like sandpaper and will destroy a bearing upon rotation. After grinding, all rings pass through multi-stage industrial ultrasonic cleaning machines. The high-frequency cavitation removes 100% of micro-debris and cutting fluids from the porous ground surfaces, followed by an immediate anti-rust oil dip and vacuum sealing.
For medical or food-grade applications requiring both high hardness and corrosion resistance, we highly recommend SUS440C stainless steel. After vacuum heat treatment and cryogenic processing, we can achieve a hardness of HRC 58+ while maintaining excellent resistance to bodily fluids and harsh sterilization chemicals.
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