7309 BEP/HC5 Hybrid Bearings with Silicon Nitride Ceramic Si3N4 Balls for Vacuum Pump

Bearing Model: 7309 BEP/HC5

Bearing Type Single-row Angular Contact Ceramic Ball Bearing 

Bore Diameter (d) 45 mm

Outer Diameter (D) 100 mm 

Width (B) 25 mm 

Contact Angle 40° 

Rolling Element Material Silicon Nitride (Si3N4) Ceramic Ball 

Mass 0.82 kg

Precision Grade P5/P4 (Optional)

Minimum Chamfer (r) 1.5 mm

Basic Dynamic Load Rating (Cr) 55.9 kN

Basic Static Load Rating (Cor) 37.5 kN

Limiting Speed (Grease Lubrication) 8000 r/min

Reference Speed 8500 r/min

Fatigue Load Limit 1.6 kN

Ring Material GCr15 Bearing Steel / 440C Stainless Steel (Optional)

7309 BEP ceramic ball bearing is a high-performance single-row angular contact bearing optimized for pump and industrial motor high-speed continuous operation scenarios. Adopting silicon nitride (Si3N4) ceramic balls and high-quality bearing steel/440C stainless steel rings, it perfectly combines the advantages of ceramic materials and BEP structural design, with excellent high-speed performance, low friction, low noise and anti-corrosion properties, and is the core supporting component for vacuum pump, servo motor, industrial transmission and fluid equipment systems.

Si3N4 ceramic ball core advantages: Silicon nitride ceramic rolling elements have a density only 40% that of steel, withstand high temperatures up to 800℃, are wear-resistant, and free from electrolytic corrosion. Suitable for long-term, high-speed, continuous operation of pumps/motors, their bearing life is more than 3 times longer than traditional steel ball bearings, reducing equipment downtime for maintenance.

High load capacity and bidirectional force: A 40° contact angle design allows simultaneous radial and unidirectional axial heavy loads, with a high rated dynamic load of 55.9kN, meeting the load requirements of high-power servo motors and high-pressure pumps.

BEP structure optimization: Utilizing a BEP non-contact sealing design, it effectively prevents dust, moisture, and fluid media impurities from entering, reducing grease loss and making it suitable for working environments with high dust and slight moisture around the pump body.

High precision, low friction, and low noise: P5/P4 grade high-precision machining ensures the ceramic balls have a friction coefficient far lower than steel balls, resulting in less heat generation during high-speed operation and operating noise ≤45dB, meeting the design requirements for low-noise motors and high-efficiency pumps.

Multi-material customization compatibility: The bearing rings support GCr15 bearing steel.

/ Customized 440C stainless steel version, resistant to weak acid and alkali corrosion, suitable for special working conditions of chemical pumps and corrosion-resistant industrial motors. International standard compatible replacement: Fully compatible with SKF, NSK, and other international brands 7309 BEP model dimensions, can directly replace original parts without adjusting the pump/motor mounting structure, reducing equipment maintenance and procurement costs.