Koyo 6304C3 Deep Groove Ball Bearing, Open, 20 x 52 x 15 mm
Available
This Koyo deep groove ball bearing (open, 6300 series) is built on the most popular rolling bearing type. Deep, uninterrupted raceway grooves in the inner and outer rings carry radial load and a certain degree of axial load in either direction, at high speed. It is supplied open, with no shields or seals, so lubrication and sealing come from the housing and the application.
The range has 17 sizes, with bores from 20 to 110 mm, C3 radial internal clearance and boundary dimensions to JIS B 1512. Koyo bearings are made by JTEKT Corporation.
Where this product is used
- Automotive: transmissions, electrical devices, and truck and trailer equipment
- Off-highway: construction equipment, agricultural equipment and railway rolling equipment
- Electrical equipment: standard motors and domestic electric appliances
- Measuring and medical instruments
- General industrial equipment
Features
- Deep, uninterrupted raceway grooves carry radial load and a certain degree of axial load in either direction
- Open construction, with lubrication and sealing provided by your housing design
- C3 radial internal clearance, larger than the normal clearance
- Boundary dimensions to JIS B 1512, tolerances to JIS B 1514-1
- Basic dynamic load ratings 15.9 to 205 kN and static 7.85 to 180 kN depending on size
- Standard cage by size: polyamide moulded and pressed steel
Key specifications
| Specification | Detail |
|---|---|
| Bearing type | Single row deep groove ball bearing |
| Series | 6300 |
| Sealing | Open |
| Radial internal clearance | C3 (larger than normal) |
| Bore diameter d | 20 to 110 mm |
| Outside diameter D | 52 to 240 mm |
| Width B | 15 to 50 mm |
| Basic dynamic load rating Cr | 15.9 to 205 kN |
| Basic static load rating C0r | 7.85 to 180 kN |
| Limiting speed, grease lubrication | 2,700 to 14,000 min-1 |
| Limiting speed, oil lubrication | 3,200 to 17,000 min-1 |
| Dimensions and tolerances | JIS B 1512 (boundary dimensions), JIS B 1514-1 (tolerances) |
| Radial internal clearance standard | JIS B 1520 |
| Standard cage | Polyamide moulded and pressed steel, depending on size |
| Brand | Koyo (JTEKT) |
Available sizes
Show all 17 sizes
| Designation | Bore d (mm) | Outer D (mm) | Width B (mm) | r min (mm) | Cr (kN) | C0r (kN) | Speed, grease (min-1) | Speed, oil (min-1) |
|---|---|---|---|---|---|---|---|---|
| 6304C3 | 20 | 52 | 15 | 1.1 | 15.9 | 7.85 | 14,000 | 17,000 |
| 6306C3 | 30 | 72 | 19 | 1.1 | 26.7 | 15 | 9,600 | 12,000 |
| 6307C3 | 35 | 80 | 21 | 1.5 | 33.4 | 19.3 | 8,500 | 10,000 |
| 6308C3 | 40 | 90 | 23 | 1.5 | 40.7 | 24 | 7,700 | 9,200 |
| 6309C3 | 45 | 100 | 25 | 1.5 | 48.9 | 29.5 | 6,800 | 8,100 |
| 6310C3 | 50 | 110 | 27 | 2 | 62 | 38.3 | 6,100 | 7,300 |
| 6311C3 | 55 | 120 | 29 | 2 | 71.6 | 45 | 5,600 | 6,700 |
| 6312C3 | 60 | 130 | 31 | 2.1 | 81.9 | 52.2 | 5,200 | 6,200 |
| 6313C3 | 65 | 140 | 33 | 2.1 | 92.7 | 59.9 | 4,800 | 5,800 |
| 6314C3 | 70 | 150 | 35 | 2.1 | 104 | 68.2 | 4,500 | 5,400 |
| 6315C3 | 75 | 160 | 37 | 2.1 | 113 | 77.2 | 4,200 | 5,000 |
| 6316C3 | 80 | 170 | 39 | 2.1 | 123 | 86.7 | 3,900 | 4,700 |
| 6317C3 | 85 | 180 | 41 | 3 | 133 | 96.8 | 3,700 | 4,400 |
| 6318C3 | 90 | 190 | 43 | 3 | 143 | 107 | 3,500 | 4,200 |
| 6319C3 | 95 | 200 | 45 | 3 | 153 | 119 | 3,300 | 4,000 |
| 6320C3 | 100 | 215 | 47 | 3 | 173 | 141 | 3,000 | 3,600 |
| 6322C3 | 110 | 240 | 50 | 3 | 205 | 180 | 2,700 | 3,200 |
Selecting the right option
Select by bore d first, then check the outside diameter D and width B in the table against your housing.
The basic dynamic load rating Cr relates to bearing life under rotating load, and the basic static load rating C0r to heavy or slow-turning duty. Compare the limiting speed for your size with the shaft speed. The speeds shown are the grease lubrication limits.
C3 is a radial internal clearance larger than normal. It is chosen where interference fits or a temperature difference between the rings take up clearance in service. Confirm the clearance class for your application.
Fitting and use
Fit the ring that has the interference fit first, and press only on that ring, never through the balls.
Lubricate to suit the application, and keep the housing clean, because there is no shield or seal on the bearing.
Where axial load is large, make the shaft shoulder and housing shoulder larger than usual.
Related products
Also available from Koyo: the 6300 contact sealed C3 range, the 6300 shielded C3 range, the 6300 open normal clearance range and the 6000 open C3 range.
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20 x 52 x 15mm bearing
Model Number: 6304C3/KOYO
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30 x 72 x 19mm bearing
Model Number: 6306C3/KOYO
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35 x 80 x 21mm bearing
Model Number: 6307C3/KOYO
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40 x 90 x 23mm bearing
Model Number: 6308C3/KOYO
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45 x 100 x 25mm bearing
Model Number: 6309C3/KOYO
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50 x 110 x 27mm bearing
Model Number: 6310C3/KOYO
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55 x 120 x 29mm bearing
Model Number: 6311C3/KOYO
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60 x 130 x 31mm bearing
Model Number: 6312C3/KOYO
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65 x 140 x 33mm bearing
Model Number: 6313C3/KOYO
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70 x 150 x 35mm bearing
Model Number: 6314C3/KOYO
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75 x 160 x 37mm bearing
Model Number: 6315C3/KOYO
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80 x 170 x 39mm bearing
Model Number: 6316C3/KOYO
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85 x 180 x 41mm bearing
Model Number: 6317C3/KOYO
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90 x 190 x 43mm bearing
Model Number: 6318C3/KOYO
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95 x 200 x 45mm bearing
Model Number: 6319C3/KOYO
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100 x 215 x 47mm bearing
Model Number: 6320C3/KOYO
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110 x 240 x 50mm bearing
Model Number: 6322C3/KOYO
