Hangzhou Huaxing Kechuang Holding Group Co., Ltd. is one of the leading manufacturers and suppliers of ball bearing 6308-2rs in China. As we have world-leading production equipment and strong manufacturing capabilities, we warmly welcome you to buy bulk high quality bearings at competitive price from our factory.
Single Row Deep Groove Ball Bearing 6308-2RS
Specifications
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Bearing Type: |
Ball bearing 6308-2RS for electric motor three-phase motor frame size 90S |
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Dimensions (dxDxB): |
40*90*23mm (6308) |
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Material: |
100% Chrome Steel for higher resistance and durability material |
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Seals: |
Rubber seals on both side |
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Retainer: |
Steel |
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Grease: |
Normal grease |
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Speed: |
7,000 rpm with grease, 8200 rpm with oil |
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Radial Internal clearance: |
C0/C3/C4 |
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Vibration: |
ZV2, ZV3, ZV4 |
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Precision: |
Precision P0, P6, P5 |
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Lubrication: |
Standard Lubrication |
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Heat Stabilization: |
Temperatures from -20°C up to 120 °C |
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Special Treatment: |
No Special Treatment |
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Brand: |
HXB or OEM brand |
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Also know as: |
6308-2RS, 6308LLU, 6308DD |
1. Bearing Material – Ring & Rolling Element Raw Material
Bearing rings and rolling elements are generally manufactured from high-carbon chromium bearing steel GCr15 (see Table 1 above).
The chemical composition of GCr15 has internationally equivalent standardized counterparts, including AISI 52100 (USA), DIN 100Cr6 (Germany) and SUJ2 (Japan).
Table 1 Chemical Composition of High Carbon Chromium Bearing Steel (For Bearing Rings & Rolling Balls)
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Standard No. |
Steel Grade |
C (wt%) |
Si (wt%) |
Mn (wt%) |
S (wt%) |
P (wt%) |
Cr (wt%) |
Mo (wt%) |
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GB/T18254 |
GCr15 |
0.95–1.05 |
0.15–0.35 |
0.25–0.45 |
≤0.025 |
≤0.025 |
1.40–1.65 |
- |
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JIS G4805 |
SUJ2 |
0.95–1.10 |
0.15–0.35 |
≤0.50 |
≤0.025 |
≤0.025 |
1.30–1.60 |
≤0.080 |
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ASTM A295 |
52100 |
0.98–1.10 |
0.15–0.35 |
0.25–0.45 |
≤0.025 |
≤0.025 |
1.30–1.60 |
≤0.100 |
2. Bearing Material – cages
Table 2 Chemical Composition of Steel Sheet for Stamped Bearing Cages
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Component Application |
Standard No. |
Steel Grade |
C (wt%) |
Si (wt%) |
Mn (wt%) |
P (wt%) |
S (wt%) |
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Steel Sheet for Stamped Bearing Cages |
JIS G3141 |
SPCC |
≤0.12 |
- |
≤0.50 |
≤0.040 |
≤0.045 |
3. Radial Clearance
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Bore Diameter |
Bore Diameter |
Group 2 |
Group 2 |
Standard Group |
Standard Group |
Group 3 |
Group 3 |
Group 4 |
Group 4 |
Group 5 |
Group 5 |
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2.5 |
6 |
0 |
7 |
2 |
13 |
8 |
23 |
14 |
29 |
20 |
37 |
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6 |
10 |
0 |
9 |
3 |
18 |
11 |
25 |
18 |
33 |
25 |
45 |
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10 |
18 |
0 |
9 |
5 |
20 |
13 |
28 |
20 |
36 |
28 |
48 |
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18 |
24 |
0 |
10 |
5 |
20 |
13 |
28 |
20 |
36 |
28 |
48 |
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24 |
30 |
1 |
11 |
5 |
20 |
15 |
33 |
23 |
41 |
30 |
53 |
Applications
Deep groove ball bearings 6308 are widely used in general mechanical equipment. They perform well under combined radial and axial loads, featuring low friction, low noise and high running speed. Such as electric motors, generators and servo motors, water pumps, fans, blowers and air compressors, agricultural machinery, light construction machinery and gearboxes, home appliances, office equipment and small rotating components.
Advantages
HXB was founded in 1995, with nearly 30 years of dedicated development, HXB now operates6 subsidiaries.
∗ 2 high-tech R&D centers
∗ 2 modern manufacturing factories - Hangzhou Yijia Precision Bearing Co., Ltd. and Zhejiang Ruiyang Bearing Technology Co., Ltd.
∗ Supported by advanced digital MES and SPC management systems
∗ IATF16949:2016, ISO9001:2015 and ISO14001 certifications
∗ High-end equipment and high-quality material
About HXB
1. Hangzhou Factory - YJB
Founded in June 2007, YJB is located in Hangzhou. As a subsidiary of HXB Group, we are a national high-tech enterprise and provincial science & technology enterprise specializing in R&D and manufacturing of high-precision, high-speed, advanced, special and professional bearings.
Core Capabilities & Intelligent Manufacturing
- Product Size: Inner diameter Φ3–Φ300mm
- Precision Classes: P2, P4 (ultra-precision grades)
- Annual Capacity: 3 million sets of precision bearings in a lean & intelligent factory
- Equipment Investment: Over RMB 3 million in world-leading precision testing instruments
- Digital Transformation: with full deployment of MESYS bearing design platform, ERP, MES, WMS, SPC real-time quality monitoring and OA systems, building a benchmark smart manufacturing plant.
Main Products
Precision Spindle Bearings
Angular Contact Ball Bearings
Servo Motor Bearings
Vacuum Pump Bearings
Ball Screw Support Bearings
2. Huzhou Factory
In 2021, the deep groove ball bearing factory relocated from Hangzhou to Huzhou. It operate in a 10,000㎡ production facility with a team of 75 employees, focused on the R&D, and manufacturing of high-performance deep groove ball bearings.
We maintain a professional engineering and quality system to ensure stable precision and reliability.
Engineering Team: 4 bearing design & process engineers, accounting for 5% of staff.
Quality Team: 15 quality personnel, including 2 quality engineers, 20% of staff, covering incoming inspection, in-process control and final testing.
Product Range
Series: 6000–6024, 6200–6214, 6300–6314, 6800–6824, 6900–6924
Features: High rigidity, low noise; suitable for grease lubrication or oil-mist lubrication.
6 Series X4YA-2RS (Double-lip seal) & APT Retainer Series
Features: High & low temperature resistance, superior sealing, high load capacity, long service life.
Application: New energy vehicle transmission systems.
Certificates
Exhibition
FAQ
Q1: Does EMQ 6308-2RS need extra waterproof protection?
No extra waterproof treatment is required. The integrated thickened rubber sealing design of 6308-2RS features tight gap sealing and excellent anti-leakage and anti-fog properties. It can directly cope with humid workshop environments, splashing water and floating fine dust, eliminating the risk of internal rusting, grease deterioration and raceway corrosion, which is far more reliable than ZZ iron-sealed bearings in harsh working conditions.
Q2: What are the service life advantages of EMQ 6308-2RS in heavy-load scenarios?
Against heavy-load and long-hour operating conditions, EMQ 6308-2RS undergoes precision screening of steel balls and super-finished raceway treatment, achieving uniform force distribution and minimal rolling friction. It reduces component wear and grease aging speed significantly. Compared with ordinary standard 6308 bearings, its overall service life is increased by 40%–60%, greatly lowering replacement frequency and equipment downtime costs for heavy-duty industrial facilities.
Q3: What temperature and speed range can EMQ 6308-2RS withstand?
Matched with high-temperature resistant long-cycle motor grease, this bearing supports a wide working temperature range from -30°C to 120°C. It maintains stable lubrication and low-vibration operation under long-time high-load heating conditions. Its rated operating speed is adapted to medium-high speed rotation of heavy-duty motors, with outstanding heat dissipation performance that effectively suppresses thermal attenuation and noise amplification during continuous operation.
Q4: What scenarios is EMQ 6308-2RS exclusively suitable for?
This model is tailored for medium and high-power industrial equipment that small-size bearings cannot support. It is widely applied in 7.5kW–15kW heavy-duty asynchronous motors, large industrial water pumps, high-power blowers, mining auxiliary machinery, food processing equipment, and industrial transmission gearboxes. It is especially ideal for humid, dusty, and high-load operating environments with continuous long-cycle operation requirements.
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