Koyo 6912-2RU Deep Groove Ball Bearing, Non-Contact Sealed (2RU), 60 x 85 x 13 mm
Available
This Koyo deep groove ball bearing (non-contact sealed, 6900 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 carries a non-contact rubber seal on each side (2RU type) and is pre-lubricated, so no greasing is needed.
The range has 7 sizes, with bores from 60 to 120 mm, normal (CN) 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
- Non-contact rubber seals (2RU) on both sides: small friction torque, good high speed performance and better sealing than the ZZ shield
- Boundary dimensions to JIS B 1512, tolerances to JIS B 1514-1
- Basic dynamic load ratings 20.2 to 57.2 kN and static 17.3 to 56.9 kN depending on size
- Standard cage by size: pressed steel and machined copper alloy
Key specifications
| Specification | Detail |
|---|---|
| Bearing type | Single row deep groove ball bearing |
| Series | 6900 |
| Sealing | Non-contact rubber seals (2RU), both sides |
| Radial internal clearance | Normal (CN) |
| Bore diameter d | 60 to 120 mm |
| Outside diameter D | 85 to 165 mm |
| Width B | 13 to 22 mm |
| Basic dynamic load rating Cr | 20.2 to 57.2 kN |
| Basic static load rating C0r | 17.3 to 56.9 kN |
| Limiting speed, grease lubrication | 3,800 to 7,500 min-1 |
| Operating temperature (standard type) | -30°C to +110°C |
| Dimensions and tolerances | JIS B 1512 (boundary dimensions), JIS B 1514-1 (tolerances) |
| Radial internal clearance standard | JIS B 1520 |
| Standard cage | Pressed steel and machined copper alloy, depending on size |
| Brand | Koyo (JTEKT) |
Available sizes
| Designation | Bore d (mm) | Outer D (mm) | Width B (mm) | r min (mm) | Cr (kN) | C0r (kN) | Speed, grease (min-1) |
|---|---|---|---|---|---|---|---|
| 6912-2RU | 60 | 85 | 13 | 1 | 20.2 | 17.3 | 7,500 |
| 6914-2RU | 70 | 100 | 16 | 1 | 23.7 | 21.2 | 6,400 |
| 6916-2RU | 80 | 110 | 16 | 1 | 25 | 24 | 5,700 |
| 6917-2RU | 85 | 120 | 18 | 1.1 | 31.9 | 29.6 | 5,300 |
| 6918-2RU | 90 | 125 | 18 | 1.1 | 32.8 | 31.6 | 5,100 |
| 6922-2RU | 110 | 150 | 20 | 1.1 | 47.9 | 47.8 | 4,100 |
| 6924-2RU | 120 | 165 | 22 | 1.1 | 57.2 | 56.9 | 3,800 |
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.
The 2RU non-contact seal has small friction torque and good high speed performance, with better grease sealing and dirt resistance than the ZZ shielded type. For wet duty, JTEKT rates the 2RS contact seal higher for water resistance.
Shielded and sealed bearings are designed for use with the inner ring rotating. Contact AIMS Industrial before using one with the outer ring rotating.
Fitting and use
Fit the ring that has the interference fit first, and press only on that ring, never through the balls.
Do not relubricate: the bearing is pre-lubricated with an appropriate volume of grease. The standard type runs from -30°C to +110°C.
Where axial load is large, make the shaft shoulder and housing shoulder larger than usual.
Related products
Also available from Koyo: the 6900 shielded range, the 6900 contact sealed range and the 6800 non-contact sealed range.
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60 x 85 x 13mm bearing
Model Number: 6912-2RU/KOYO
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70 x 100 x 16mm bearing
Model Number: 6914-2RU/KOYO
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80 x 110 x 16mm bearing
Model Number: 6916-2RU/KOYO
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85 x 120 x 18mm bearing
Model Number: 6917-2RU/KOYO
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90 x 125 x 18mm bearing
Model Number: 6918-2RU/KOYO
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110 x 150 x 20mm bearing
Model Number: 6922-2RU/KOYO
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120 x 165 x 22mm bearing
Model Number: 6924-2RU/KOYO
