Servo Motor Bearings

Hybrid-high speed servo motor bearing

60% lighter balls, up to 50% higher speed, and electrical insulation built in — hybrid precision engineered for high-speed servo motors.

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ECMA-C21010

Servo Motor Bearing B25-254
Bearing Type: B25-254-high speed servo motor bearing
Dimensions (dxDxB): 25x52x20.6mm
Material: Chrome steel GCr15, SAE52100, SUJ2, Si3N4 ceramic balls
Seals: Contact NBR...
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Servo Motor Bearing B25-224
Bearing Type: B25-224-high speed servo motor bearing
Dimensions (dxDxB): 25x62x16mm
Material: Chrome steel GCr15, SAE52100, SUJ2, ceramic balls
Seals: Contact NBR seals on...
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Servo Motor Bearing 62207
Bearing Type: 62207-2RS -high speed ceramic servo motor bearing
Dimensions (dxDxB): 35x72x23mm
Material: Chrome steel GCr15, SAE52100, SUJ2, Si3N4 ceramic balls
Seals: Contact...
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Servo Motor Bearing 6210
Bearing Type: 6210-2RS for high speed SIEMENS servo motor
Dimensions (dxDxB): 50x90x20mm
Material: Chrome steel GCr15, SAE52100, SUJ2, Si3N4 ceramic balls
Seals: Contact NBR seals...
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Servo Motor Bearing 6206
Bearing Type: 6206V-2RSP5 for high speed SIEMENS servo motor
Dimensions (dxDxB): 30x62x16mm
Material: Chrome steel GCr15, SAE52100, SUJ2, Si3N4 ceramic balls
Seals: Contact...
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Ceramic Motor Bearing B40-180
Bearing Type: B40-180-high speed ceramic servo motor bearing
Dimensions (dxDxB): 40x90x23mm
Material: Chrome steel GCr15, SAE52100, SUJ2, Si3N4 ceramic balls
Seals: Contact NBR...
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Core Technical Advantages

≈60% lighter rolling elements

Silicon nitride (Si₃N₄) balls weigh ~60% less than chrome-steel balls (density ≈3.2 vs 7.8 g/cm³). Lighter balls generate far lower centrifugal force at speed, so outer-raceway loading drops and speed capability rises.

Higher speed capability (higher DN value)

Reduced centrifugal loading allows higher bore × speed operation, the standard for high-speed servo and spindle duty.

Electrical insulation built in

Si₃N₄ is an electrical insulator (10¹²–10¹⁴ Ω·cm). In PWM/inverter-driven servo motors it breaks induced shaft-current paths, preventing EDM damage and bearing fluting.

Cooler running, lower temperature rise

Less internal friction and heat generation extend grease life, lengthen maintenance intervals and reduce spindle thermal growth.

Low vibration & low noise

Ceramic balls' superior roundness and finish support smoother axis motion and better surface quality.

Longer service life

Lower contact loads, lower heat and insulation together suppress smearing, pitting and fluting wear modes.

High-speed start-stop robustness

Lower inertia and better oil-film separation reduce adhesive wear during rapid acceleration, braking and reversing.

Drop-in, dimensionally identical

Steel rings keep standard ISO dimensions and fits: no shaft, housing or design changes — only performance improves.

Customer pain	Hybrid solution	Measurable benefit
Bearing failure from EDM / fluting on inverter drives	Insulating ceramic balls break the current path	No fluting damage; longer motor life; fewer warranty claims
Speed capped by all-steel bearings	≈60% lighter balls cut centrifugal load	Up to ~50% higher speed capability at the same envelope
Overheating shortens grease life	Cooler running, lower friction	Longer grease life, longer intervals, less downtime
Noise/vibration hurts precision	Superior ball roundness and finish	Smoother running, better workpiece surface quality
Unplanned downtime is costly	Reduced smearing/pitting/fluting wear	Higher uptime, predictabl

Parameter	Specification
Bearing type	Hybrid deep groove ball bearing — Si₃N₄ ceramic balls on steel rings
Standards	ISO 15 (dimensions) · ISO 26602 (Si₃N₄) · DIN 625 · ISO 15242-3 (vibration)
Size range	Metric deep-groove series, bore 3–100 mm；imperial sizes on request
Ball material	Silicon nitride Si₃N₄，density ≈3.2 g/cm³（~60% lighter than steel balls）
Ring material	AISI 52100 chrome steel (standard)；stainless / high-temp steels optional
Cage	High-speed polymer (PA66 / PEEK) or machined brass
Load ratings (Cr / C0r)	Size-dependent — per catalog for the selected size
Limiting speed	Size- and grease-dependent；hybrid typically +20–50% over all-steel of the same size
Electrical insulation	≥ 10⁹ Ω across the ball contact path
Mass	Size-dependent
Operating temperature	−40 to +150 °C (grease-dependent)
Internal clearance	C3 standard；C2–C5 or custom
Seals	Open / Z / ZZ / RS / 2RS
Precision	P0 (ABEC-1) standard；P6 (ABEC-3) recommended for servo；P5 available
Noise / vibration	Measured to ISO 15242-3；low-noise sorting available

Industry	Typical application	Where the bearing works	Key requirement → hybrid advantage
Servo motors & drives	AC servo motors for robots, CNC, packaging lines	Motor shaft DE + NDE	High speed · low noise · long grease life → higher speed rating, cooler running, longer life
Machine tools / CNC spindles	Spindle drive motors, high-speed machining centers	Motor end & spindle support	High DN · low vibration · thermal stability → up to ~50% higher speed, less heat, better surface finish
Robotics & automation	6-axis arms, SCARA, AGV drive motors	Joint servo motors	Rapid start-stop · reversing · compact → low inertia, smearing-resistant, high uptime
Semiconductor equipment	Wafer-handling robots, precision stages, high-speed spindles	Cleanroom motor bearings	Precision · cleanliness · high speed → low wear, low particle emission, stable accuracy
EV & traction motors	EV drive motors, e-bikes, industrial traction	Traction motor DE + NDE	Shaft-current insulation · speed · reliability → ceramic balls break EDM path, no fluting
Packaging & bottling lines	Servo-driven wrappers, fillers, labelers	Inverter-driven servo motors	Continuous duty · uptime → EDM protection, longer MTBF, fewer stoppages
Textile machinery	High-speed spinning, weaving, knitting motors	Motor bearings, driven rollers	High speed · dust · low maintenance → speed headroom, sealed-for-life options
Medical equipment	Surgical motors, imaging systems, dental handpieces	Miniature high-speed motors	Quiet · clean · reliability → low noise, low vibration, long service life
Printing & paper converting	Servo-driven presses, cutters, folders	Drive motors, roller supports	Registration precision · speed · low vibration → smoother running, consistent quality
Food & beverage processing	Servo fillers, mixers, conveyors	Washdown-rated motors	Hygiene · reliability → stainless ring + hybrid options, longer intervals

FAQ Content

Q1. What is a hybrid bearing and how is it different from a standard bearing?

A hybrid bearing uses silicon nitride (Si₃N₄) ceramic balls with steel rings instead of all-steel balls. It keeps the same ISO dimensions and fits as a standard deep groove ball bearing, but the ceramic balls are about 60% lighter and electrically insulating.

Q2. Why are hybrid bearings used in high-speed servo motors?

Lighter balls generate far lower centrifugal force at high speed, which allows higher speeds with less heat. Ceramic balls also insulate the bearing against electrical currents. The result is higher speed capability, cooler running and protection from EDM damage.

Q3. How does a hybrid bearing prevent EDM damage and fluting?

In inverter/PWM-driven motors, induced shaft currents can discharge through steel bearings, causing electric discharge machining (EDM) of the raceways and bearing fluting. Ceramic balls are electrical insulators (10¹²–10¹⁴ Ω·cm), so they break the current path and prevent this damage.

Q4. How much higher speed can a hybrid bearing achieve?

Typically up to about 50% higher speed capability than an all-steel bearing of the same size, depending on size, cage, grease and duty cycle. Exact values should be confirmed with the manufacturer's catalog.

Q5. Do I need to change my shaft or housing design?

No. Hybrid bearings keep standard ISO dimensions, clearances and fits, so they are drop-in replacements — only performance improves.

Q6. Do hybrid bearings need special lubrication?

They use the same grease families as steel bearings, but high-speed servo applications usually specify a high-speed, wide-temperature grease. Sealed (2RS/ZZ) and open versions are both available.

Q7. Are hybrid bearings quieter than steel bearings?

Generally yes. Ceramic balls have superior roundness and surface finish and generate lower noise and vibration, which supports servo precision and workpiece surface quality.

Q8. Are hybrid bearings worth the higher initial cost?

For high-speed or inverter-driven servo applications, yes. Lower heat, longer grease life, no EDM wear and longer MTBF reduce the total cost of ownership and downtime over the bearing's service life.

Hangzhou Huaxing Kechuang Holding Group Co., Ltd. is one of the leading manufacturers and suppliers of servo motor bearings in China, featured by quality products and good service. Please rest assured to buy bulk durable servo motor bearings from our factory. Welcome to view our website for more information.

6308V, Servo Motor Bearing B25 224, Servo Motor Bearing B25 254