Open Bearings
Open bearings are suitable for protected housings or applications requiring regular relubrication. They generally provide lower friction and higher speed capability than sealed versions under controlled conditions.
BMT Bearings supplies standard and customized Deep Groove Ball Bearings for electric motors, pumps, gearboxes, conveyors, household appliances, agricultural machinery, industrial automation, and general rotating equipment. Their simple structure, low friction, and ability to carry radial loads and limited axial loads in both directions make them suitable for a wide range of industrial applications.
Available configurations include open, shielded, sealed, stainless steel, ceramic, and hybrid bearings, with different internal clearances, cages, lubricants, and packaging formats. Selection depends on shaft size, load, speed, temperature, lubrication, contamination, installation conditions, and expected service life.
With more than 100 automated production lines, annual capacity exceeding 100 million bearings, and a 2-year warranty, BMT Bearings supports standard orders, OEM projects, private-label programs, and long-term industrial supply.
Deep Groove Ball Bearings consist of an inner ring, outer ring, rolling balls, cage, and, depending on the configuration, shields or seals. Their raceway design supports radial loads and limited axial loads from either direction.
The standard single-row design balances load capacity, speed, friction, and cost, making it suitable for compact equipment and industrial assemblies.
Open bearings are suitable for protected housings or applications requiring regular relubrication. They generally provide lower friction and higher speed capability than sealed versions under controlled conditions.
Shielded bearings use non-contact metal shields to reduce dust entry and retain lubricant. They are commonly used in electric motors, fans, gearboxes, tools, and similar equipment.
Sealed bearings retain grease and provide improved protection against dust and moisture. They are suitable where maintenance access is limited or relubrication is impractical.
Stainless steel bearings are suitable for applications requiring corrosion resistance, including food-processing equipment, medical devices, laboratory machinery, cleaning systems, and humid environments.
Hybrid bearings combine steel rings with ceramic balls to reduce rotating mass, provide electrical insulation, and support high-speed operation. Full ceramic versions are available for selected applications requiring corrosion resistance, non-magnetic performance, electrical insulation, or clean operation.
The cage, lubricant, clearance, preload, and operating environment should be selected together with the bearing material.
The correct bearing should be selected according to actual operating conditions, not dimensions alone.
Check the radial and axial loads. Dynamic load rating is used for service-life calculations, while static load rating is important for stationary, shock-load, or low-speed conditions.
Confirm the required rotational speed. Seals, grease quantity, cage material, internal clearance, and operating temperature can affect speed capability.
Internal clearance affects temperature, noise, vibration, and service life. Standard clearance suits many applications, while C3, C4, or other grades may be required for higher temperatures, interference fits, or thermal expansion.
Select open, shielded, or sealed designs according to contamination, moisture, lubrication, and maintenance requirements. Contact seals provide better protection, while non-contact shields generally offer lower friction.
Grease is commonly used for sealed and shielded bearings, while open bearings may use grease or oil. Lubricant type and quantity should match the speed, temperature, load, and environment.
Shaft and housing fits should consider load direction, rotating ring conditions, temperature, and thermal expansion. Excessive interference may reduce internal clearance, while a loose fit may cause creep or fretting.
BMT Bearings provides different materials and configurations according to application requirements.
Bearing steel provides a balance of hardness, fatigue strength, wear resistance, and cost efficiency for standard Deep Groove Ball Bearings.
Stainless steel is suitable for applications exposed to moisture, cleaning agents, or corrosive environments, including food equipment, medical machinery, laboratory systems, and outdoor equipment.
Silicon nitride ceramic balls reduce rotating mass and friction while providing electrical insulation and wear resistance. Hybrid bearings are commonly used in motors, generators, machine tools, robotics, compressors, and electric vehicles.
Cage materials may include pressed steel, machined brass, polyamide, or other engineering materials. Selection depends on speed, temperature, lubrication, chemical exposure, and application requirements.
Deep Groove Ball Bearings are commonly used in electric motors and generators, water pumps, fans, blowers, gearboxes, reducers, conveyors, machine tools, industrial automation equipment, textile machinery, agricultural machinery, household appliances, automotive auxiliary systems, robotics, electric vehicles, medical equipment, and laboratory equipment.
Their standardized dimensions and broad model range support both new equipment design and replacement applications.
BMT Bearings supplies miniature radial bearings, standard Deep Groove Ball Bearings, stainless steel bearings, ceramic and hybrid bearings, and related configurations. Products can be customized with different seals, shields, cages, internal clearances, lubricants, markings, and packaging.
| Designation | d (mm) | D (mm) | B (mm) |
|---|---|---|---|
| 684 | 4 | 9 | 2.5 |
| 694 | 4 | 11 | 4 |
| 604 | 4 | 12 | 4 |
| 624 | 4 | 13 | 5 |
| 634 | 4 | 16 | 5 |
| 685 | 5 | 11 | 3 |
| 695 | 5 | 13 | 4 |
| 605 | 5 | 14 | 5 |
| 625 | 5 | 16 | 5 |
| 635 | 5 | 19 | 6 |
| 686 | 6 | 13 | 3.5 |
| 696 | 6 | 15 | 5 |
| 606 | 6 | 17 | 6 |
| 626 | 6 | 19 | 6 |
| 636 | 6 | 22 | 7 |
| 687 | 7 | 14 | 3.5 |
| 697 | 7 | 17 | 5 |
| 607 | 7 | 19 | 6 |
| 627 | 7 | 22 | 7 |
| 637 | 7 | 26 | 9 |
| 688 | 8 | 16 | 4 |
| 698 | 8 | 19 | 6 |
| 608 | 8 | 22 | 7 |
| 628 | 8 | 24 | 8 |
| 638 | 8 | 28 | 9 |
| 689 | 9 | 17 | 4 |
| 699 | 9 | 20 | 6 |
| 609 | 9 | 24 | 7 |
| 629 | 9 | 26 | 8 |
| 639 | 9 | 30 | 10 |
| 6800 | 10 | 19 | 5 |
| 6900 | 10 | 22 | 6 |
| 6000 | 10 | 26 | 8 |
| 6200 | 10 | 30 | 9 |
| 6300 | 10 | 35 | 11 |
| 6801 | 12 | 21 | 5 |
| 6901 | 12 | 24 | 6 |
| 16001 | 12 | 28 | 7 |
| 6001 | 12 | 28 | 8 |
| 6201 | 12 | 32 | 10 |
| 6301 | 12 | 37 | 12 |
| 6802 | 15 | 24 | 5 |
| 6902 | 15 | 28 | 7 |
| 16002 | 15 | 32 | 8 |
| 6002 | 15 | 32 | 9 |
| 6202 | 15 | 35 | 11 |
| 6302 | 15 | 42 | 13 |
| 6803 | 17 | 26 | 5 |
| 6903 | 17 | 30 | 7 |
| 16003 | 17 | 35 | 8 |
| 6003 | 17 | 35 | 10 |
| 6203 | 17 | 40 | 12 |
| 6303 | 17 | 47 | 14 |
| 6804 | 20 | 32 | 7 |
| 6904 | 20 | 37 | 9 |
| 16004 | 20 | 42 | 8 |
| 6004 | 20 | 42 | 12 |
| 6204 | 20 | 47 | 14 |
| 6304 | 20 | 52 | 15 |
| 6805 | 25 | 37 | 7 |
| 6905 | 25 | 42 | 9 |
| 16005 | 25 | 47 | 8 |
| 6005 | 25 | 47 | 12 |
| 6205 | 25 | 52 | 15 |
| 6305 | 25 | 62 | 17 |
| 6806 | 30 | 42 | 7 |
| 6906 | 30 | 47 | 9 |
| 16006 | 30 | 55 | 9 |
| 6006 | 30 | 55 | 13 |
| 6206 | 30 | 62 | 16 |
| 6306 | 30 | 72 | 19 |
| 6807 | 35 | 47 | 7 |
| 6907 | 35 | 55 | 10 |
| 16007 | 35 | 62 | 9 |
| 6007 | 35 | 62 | 14 |
| 6207 | 35 | 72 | 17 |
| 6307 | 35 | 80 | 21 |
| 6808 | 40 | 52 | 7 |
| 6908 | 40 | 62 | 12 |
| 16008 | 40 | 68 | 9 |
| 6008 | 40 | 68 | 15 |
| 6208 | 40 | 80 | 18 |
| 6308 | 40 | 90 | 23 |
| 6809 | 45 | 58 | 7 |
| 6909 | 45 | 68 | 12 |
| 16009 | 45 | 75 | 10 |
| 6009 | 45 | 75 | 16 |
| 6209 | 45 | 85 | 19 |
| 6309 | 45 | 100 | 25 |
| 6810 | 50 | 65 | 7 |
| 6910 | 50 | 72 | 12 |
| 16010 | 50 | 80 | 10 |
| 6010 | 50 | 80 | 16 |
| 6210 | 50 | 90 | 20 |
| 6310 | 50 | 110 | 27 |
| 6811 | 55 | 72 | 9 |
| 6911 | 55 | 80 | 13 |
| 16011 | 55 | 90 | 11 |
| 6011 | 55 | 90 | 18 |
| 6211 | 55 | 100 | 21 |
| 6311 | 55 | 120 | 29 |
| 6812 | 60 | 78 | 10 |
| 6912 | 60 | 85 | 13 |
| 16012 | 60 | 95 | 11 |
| 6012 | 60 | 95 | 18 |
| 6212 | 60 | 110 | 22 |
| 6312 | 60 | 130 | 31 |
| 6813 | 65 | 85 | 10 |
| 6913 | 65 | 90 | 13 |
| 16013 | 65 | 100 | 11 |
| 6013 | 65 | 100 | 18 |
| 6213 | 65 | 120 | 23 |
| 6313 | 65 | 140 | 33 |
| 6814 | 70 | 90 | 10 |
| 6914 | 70 | 100 | 16 |
| 16014 | 70 | 110 | 13 |
| 6014 | 70 | 110 | 20 |
| 6214 | 70 | 125 | 24 |
| 6314 | 70 | 150 | 35 |
| 6815 | 75 | 95 | 10 |
| 6915 | 75 | 105 | 16 |
| 16015 | 75 | 115 | 13 |
| 6015 | 75 | 115 | 20 |
| 6215 | 75 | 130 | 25 |
| 6816 | 80 | 100 | 10 |
| 6916 | 80 | 110 | 16 |
| 16016 | 80 | 125 | 14 |
| 6016 | 80 | 125 | 22 |
| 6216 | 80 | 140 | 26 |
| 6817 | 85 | 110 | 13 |
| 6917 | 85 | 120 | 18 |
| 16017 | 85 | 130 | 14 |
| 6017 | 85 | 130 | 22 |
| 6217 | 85 | 150 | 28 |
| 6818 | 90 | 115 | 13 |
| 6918 | 90 | 125 | 18 |
| 16018 | 90 | 140 | 16 |
| 6018 | 90 | 140 | 24 |
| 6819 | 95 | 120 | 13 |
| 6919 | 95 | 130 | 18 |
| 16019 | 95 | 145 | 16 |
| 6019 | 95 | 145 | 24 |
| 6820 | 100 | 125 | 13 |
| 6920 | 100 | 140 | 20 |
| 16020 | 100 | 150 | 16 |
| 6020 | 100 | 150 | 24 |
| 6821 | 105 | 130 | 13 |
| 6921 | 105 | 145 | 20 |
| 6822 | 110 | 140 | 16 |
| 6922 | 110 | 150 | 20 |
| 6824 | 120 | 150 | 16 |
For drawings, 3D models, load ratings, speed recommendations, or application confirmation, please contact BMT Bearings.
Deep Groove Ball Bearings are primarily designed for radial loads and can accommodate limited axial loads in both directions. For combined loads, check the bearing size and internal design carefully.
Open bearings generally provide the highest speed capability under suitable lubrication. Sealed and shielded versions may have lower limits because of seal friction, grease quantity, and heat generation.
Raceway accuracy, ball quality, cage design, lubrication, clearance, and installation affect noise and vibration. BMT Bearings can provide different precision and noise requirements for motors, fans, pumps, and other equipment.
Operating temperature depends on material, seal type, cage, lubricant, load, speed, fit, and heat dissipation. High-temperature applications may require special grease, clearance, cage materials, or seals.
BMT Bearings manages raw materials, grinding, heat treatment, assembly, lubrication, marking, and final inspection according to customer specifications. Inspection may include dimensions, rotation torque, radial clearance, vibration, noise, appearance, sealing condition, and packaging.
The company operates under GB/T19001-2016 / ISO 9001:2015 and IATF 16949:2016 quality management systems. With more than 100 automated grinding and assembly lines and annual capacity exceeding 100 million bearings, BMT Bearings supports repeatable production for standard and customized orders.
OEM and private-label options may include material, seal or shield type, cage, internal clearance, preload, lubrication, marking, packaging, inspection requirements, samples, technical documents, and long-term supply programs.
Before installation, clean the shaft, housing, tools, and surrounding components to prevent contamination.
Confirm shaft and housing fits according to load, speed, temperature, thermal expansion, and alignment conditions.
Apply installation force to the correct bearing ring. Do not transmit impact through the rolling elements.
Use the recommended lubricant type and quantity. Excessive or insufficient lubricant may increase temperature, noise, and wear.
After installation, check rotation, noise, vibration, and temperature. During initial operation, increase speed and load gradually while monitoring the bearing.
They are primarily designed for radial loads and can accommodate limited axial loads in both directions. Actual capacity depends on size, internal design, speed, lubrication, and operating conditions.
Open bearings have no protective closure and suit protected housings or relubrication. Shielded bearings use non-contact metal shields to reduce contamination and retain lubricant. Sealed bearings provide better protection against dust and moisture.
Standard clearance suits many applications. C3 or higher may be required for higher temperatures, interference fits, or thermal expansion. The correct grade should be confirmed according to shaft, housing, speed, load, and temperature.
Yes. Deep Groove Ball Bearings are widely used in electric motors and generators. For inverter-driven motors or applications exposed to electrical current damage, hybrid ceramic configurations may provide additional insulation.
Yes. BMT Bearings supplies standard bearing steel, stainless steel, hybrid ceramic, and selected full ceramic configurations.
Yes. BMT Bearings provides standard models, OEM customization, private labeling, technical documents, samples, bulk orders, and long-term supply programs.
Please provide the bearing designation or shaft and housing dimensions, operating speed, radial and axial loads, temperature, lubrication method, sealing requirements, contamination level, electrical conditions, and working environment.
BMT Bearings can recommend a suitable bearing series, material, seal or shield, internal clearance, cage, lubricant, and packaging configuration.
24-hour technical consultation available.
