
7048 CDGA/P4A
Dimensions
| d |
240 mm |
Bore diameter |
|---|---|---|
| D |
360 mm |
Outside diameter |
| B |
56 mm |
Width |
| d1 |
277 mm |
Shoulder diameter of inner ring (large side face) |
| d2 |
277 mm |
Shoulder diameter of inner ring (small side face) |
| D1 |
323 mm |
Shoulder diameter of outer ring (large side face) |
| r1,2 |
min.3 mm |
Chamfer dimension |
| r3,4 |
min.1.5 mm |
Chamfer dimension |
| a |
68.4 mm |
Distance from side face to pressure point |
Abutment dimensions
| da |
min.253 mm |
Diameter of shaft abutment |
|---|---|---|
| db |
min.253 mm |
Diameter of shaft abutment |
| Da |
max.347 mm |
Diameter of housing abutment |
| Db |
max.354 mm |
Diameter of housing abutment |
| ra |
max.2.5 mm |
Radius of fillet |
| rb |
max.1.5 mm |
Radius of fillet |
| dn |
287 mm |
Position of oil nozzle |
Calculation data
| Basic dynamic load rating | C |
345 kN |
|---|---|---|
| Basic static load rating | C0 |
490 kN |
| Fatigue load limit | Pu |
12 kN |
| Attainable speeds |
Refer to catalogue data or contact SKF for the attainable speeds |
|
| Contact angle | α |
15 ° |
| Ball diameter | Dw |
38.1 mm |
| Number of rows | i |
1 |
| Number of balls (per bearing) | z |
22 |
| Reference grease quantity (per bearing) | Gref |
216 cm³ |
| Preload class |
A |
|
| Preload when unmounted | G |
1 300 N |
| Axial stiffness |
234 N/µm |
| Correction factor dependent on bearing series and size | f |
1.15 |
|---|---|---|
| Correction factor dependent on contact angle | f1 |
1 |
| Correction factor, preload class A | f2A |
1 |
| Correction factor for hybrid bearings | fHC |
1 |
| Calculation factor for equivalent loads | f0 |
15.8 |
|---|---|---|
| Additional factors for equivalent loads |
Refer to Notes 1 and 2 below |
Characteristics of Precision Contact Bearings
Precision contact bearings are engineered with exceptional accuracy to ensure optimal performance in various mechanical applications. These bearings feature tight dimensional tolerances and precise geometric shapes, which contribute to their high rotational accuracy and low noise levels. The materials used in their construction, often high-quality steels or ceramics, are chosen for their durability and resistance to wear, ensuring long service life even under demanding conditions. Precision contact bearings typically include configurations such as ball bearings, roller bearings, and needle bearings, each designed to address specific load and speed requirements. Their design also incorporates advanced lubrication systems to reduce friction and heat generation, thereby enhancing efficiency and reliability.
Advantages of Precision Contact Bearings
The primary advantage of precision contact bearings lies in their ability to sustain high precision under various operating conditions. They offer superior load-carrying capacity, making them ideal for applications requiring heavy loads while maintaining high speeds. The precision of these bearings minimizes vibration and noise, which is critical in sensitive environments such as medical equipment or precision instruments. Additionally, their robust construction ensures reliability and longevity, reducing maintenance costs and downtime. The use of advanced materials and lubrication techniques further enhances their performance, providing resistance to corrosion and wear. This combination of features makes precision contact bearings an indispensable component in precision engineering and high-performance machinery.
Applications of Precision Contact Bearings
Precision contact bearings are widely applied in a variety of industries due to their exceptional performance characteristics. In the automotive sector, they are crucial for the smooth operation of engines, transmissions, and suspension systems, ensuring reliability and fuel efficiency. Aerospace applications utilize these bearings for their ability to withstand extreme conditions and high speeds, contributing to the safety and efficiency of aircraft. Industrial machinery, such as CNC machines and robotics, benefit from the high precision and durability of these bearings, enabling consistent and accurate operations. Medical devices, which demand minimal noise and vibration, also rely on precision contact bearings to ensure patient comfort and device effectiveness. Overall, the versatility and reliability of precision contact bearings make them essential in numerous high-precision and high-performance applications across different sectors.
| NO. | d[mm] | D[mm] | B[mm] |
| 71972 CDMA/P4A | 360 | 480 | 56 |
| 71972 ACDMA/P4A | 360 | 480 | 56 |
| 71968 CDMA/P4A | 340 | 460 | 56 |
| 71960 CDMA/P4A | 300 | 420 | 56 |
| 71960 ACDMA/P4A | 300 | 420 | 56 |
| 7052 ACD/P4ADGB | 260 | 400 | 130 |
| 7052 ACD/P4A | 260 | 400 | 65 |
| 71956 CDGA/P4A | 280 | 380 | 46 |
| 71956 CD/P4ATBTA | 280 | 380 | 138 |
| 71956 CD/P4A | 280 | 380 | 46 |
| 71956 CD/HCP4A | 280 | 380 | 46 |
| 71956 ACDGA/P4A | 280 | 380 | 46 |
| 71956 ACD/P4ATGB | 280 | 380 | 138 |
| 71956 ACD/P4ATBTB | 280 | 380 | 138 |
| 71956 ACD/P4ADGA | 280 | 380 | 92 |
| 71956 ACD/P4A | 280 | 380 | 46 |
| 71956 ACD/HCP4ADGA | 280 | 380 | 92 |
| 71952 CDGA/P4A | 260 | 360 | 46 |
| 71952 CD/P4ADBB | 260 | 360 | 92 |
| 71952 CD/P4ADBA | 260 | 360 | 92 |
| 71952 CD/P4A | 260 | 360 | 46 |
| 71952 ACDGB/P4A | 260 | 360 | 46 |
| 71952 ACDGA/P4AL | 260 | 360 | 46 |
| 71952 ACDGA/P4A | 260 | 360 | 46 |
| 71952 ACD/P4ATBTB | 260 | 360 | 138 |
| 71952 ACD/P4AQBCA | 260 | 360 | 184 |
| 71952 ACD/P4ADGA | 260 | 360 | 92 |
| 71952 ACD/P4ADBC | 260 | 360 | 92 |
| 71952 ACD/P4ADBB | 260 | 360 | 92 |
| 71952 ACD/P4ADBA | 260 | 360 | 92 |
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