Cylindrical roller bearings for main spindles are used when the very highest precision is required under very high radial load. Typical areas of application include machine tools and printing machinery. The bearings facilitate bearing arrangements with very high precision, high radial rigidity and very high load carrying capacity. In machine tool building, they provide radial support for the main spindle.
These are single or double row cylindrical roller bearings with a largely tapered bore (taper 1:12) and a removable outer ring, which can thus be mounted separately from the normal bearing package. The inner ring is only removable in the case of series NNU49.
The bearings are available in various designs which are matched to different requirements. For example, hybrid cylindrical roller bearings with half the number of rollers can achieve extremely high speeds.
Main Dimensions & Performance Data
| d |
190 mm
|
Bore diameter |
| D |
290 mm
|
Outside diameter |
| B |
75 mm
|
Width |
| Cr |
580,000 N
|
Basic dynamic load rating, radial |
| C0r |
1,040,000 N
|
Basic static load rating, radial |
| Cur |
122,000 N
|
Fatigue load limit, radial |
| nG Grease |
2,750 1/min
|
Limiting speed for grease lubrication |
| nG Oil |
3,200 1/min
|
Limiting speed for oil lubrication |
| ≈m |
16.969 kg
|
Weight |
Mounting dimensions
| da |
219 mm
|
diameter shaft shoulder |
|
h12
|
diameter shaft shoulder tolerance |
| Da |
271 mm
|
diameter of housing shoulder |
|
H12
|
Shoulder diameter outer ring clearance |
| ra1 max |
2.1 mm
|
Maximum recess radius |
Dimensions
| r1 min |
2.1 mm
|
Minimum chamfer dimension |
| E |
265 mm
|
Raceway diameter outer ring |
| ns |
12.2 mm
|
Width of lubricating groove |
| ds |
6.3 mm
|
Diameter lubrication hole |
| s |
4.8 mm
|
Axial displacement |
Temperature range
| Tmin |
-30 °C
|
Operating temperature min. |
| Tmax |
150 °C
|
Operating temperature max. |
Your current product variant
| Cage |
M |
Brass Cage |
| Tolerance class |
SP |
tolerance class SP |
| Bore type |
K |
Tapered, taper 1:12 |
| Change mark |
A |
Internal Variant A |
| Radial internal clearance |
C1 (Group 1) |
Internal clearance smaller than C2 |
| Number of rolling element rows |
2 |
Double-row design |
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Royal Mail Standard Shipping
£1.50 - Our cheapest shipping method for parcels up to 500g. Parcels are sent using the Royal Mail standard shipping service and usually take 2-5 working days to arrive. This service isn’t tracked at any stage until point of delivery.
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Returns Policy
1. You may return an unused item in new condition unless faulty within 30 days of receipt. Damaged or used goods cannot be refunded.
2. A copy of our returns form must be included with the returned goods.
3. Customers will be responsible for the original and return shipping charges unless our customer service department determines that we are at fault for an order error or product defect. Bearing King will not be responsible for any return item lost in transit.
4. Once we receive the package and the goods are checked, we will refund you by the payment method used when the order was placed.
5. Please allow 3-5 days for your return to be processed or exchange to be sent.
