628 deep groove ball bearings specification
| Deep Groove Ball Bearings No. | I.D | O.D | B | |||
| d | d | Open type | ||||
| mm | inch | mm | inch | mm | inch | |
| 628 | 8 | 0.3150 | 24 | 0.9449 | 8 | 0.3150 |
| Deep Groove Ball Bearings No. | B | Load Rating(KN) | Steel Ball Parameter | |||
| Closed type | Dynamic | Static | No. | Size | ||
| mm | inch | Cr | Cor | mm | ||
| 628 | 8 | 0.3150 | 3.33 | 1.41 | 7 | 3.969 |
| Deep Groove Ball Bearings No. | Max speed | Weight Kg | ||||
| Grease | Oil | |||||
| r/min | r/min | |||||
| 628 | 29000 | 34000 | 0.0170 | |||
Internal Clearance of 628 bearings:
The internal clearance of a bearing refers to the amount of movement when one of the inner or outer rings is fixed and the other is moved.
Radial internal clearance, axial internal clearance.
The amount of movement during radial movement is called radial clearance, and the amount of movement during axial movement is called axial clearance.
When measuring the internal clearance of a bearing, in order to obtain a stable measurement value, a specified measurement load is generally applied to the bearing. Therefore, the measured internal clearance is larger than the true clearance (called the theoretical clearance), which increases the elastic deformation caused by the measured load.
The internal clearance of bearings is generally expressed as theoretical clearance.
The internal clearance of the bearing will affect the bearing performance (service life, temperature rise, noise, vibration, etc.).
Application of 628 bearings:
NSAR are widely used in household appliance. micro-motors electrical tools garden machinery, motorcycles,automobiles,medical equipment, sports machinery, textile machinery and agricultural machinery.
Advantages of 628 bearing:
The bearings we manufacture are all low noise,low vibration,low friction, high precision, high sealed,high turning speed and long life.
Quality assurance certificate of 628 deep groove ball bearings:
Quality is the key point for the NSAR. bearing’s growth and development, which always regards the improvement of high quality and service as the long-term-development strategy. NSAR has passed IS09001: 2000, 1S09001: 2008, and will struggle for the NSAR in long term.
Radial Clearance of 628 bearings
Deep groove ball bearing radial clearance (without load)
The radial clearance of deep groove ball bearings can be divided into 5 groups, namely C2, CO, C3, C4 and C5, where CO is the standard clearance. The following table shows the specifications of these five groups.
Radial clearance of 628 bearings
| The inside diameter of | C2 | ||||
| Exceed | Include | ||||
| mm | inch | mm | inch | minimum value | maximum value |
| 2.5 10 18 | 0.0984 0.3937 0.7887 | 10 18 24 | 0.3937 0.7087 0.9449 | 0 0 0 | 7 9 10 |
| 24 30 40 | 0.9449 1.1811 1.5748 | 30 40 50 | 1.1811 1.5748 1.9685 | 1 1 1 | 11 11 11 |
| 50 | 1.9685 | 65 | 2.5591 | 1 | 15 |
| standard | C3 | C4 | |||
| minimum value | maximum value | minimum value | maximum value | minimum value | maximum value |
| 2 3 5 | 13 18 20 | 8 11 13 | 23 25 28 | 14 18 20 | 29 33 36 |
| 5 6 6 | 20 20 23 | 13 15 16 | 28 33 36 | 23 28 30 | 41 46 51 |
| 8 | 28 | 23 | 43 | 38 | 61 |
| C5 | |||||
| minimum value | maximum value | ||||
| 20 25 28 | 37 45 48 | ||||
| 30 40 45 | 53 64 73 | ||||
| 55 | 90 | ||||
