7048 CDGA/P4A

7048 CDGA/P4A

These super-precision, high-capacity, single row angular contact ball bearings accommodate radial and axial loads acting simultaneously, where the axial load acts in one direction only. They are designed to accommodate heavy loads at relatively high speeds under low to moderate operating temperatures. Being universally matchable, they can be used together in arrangements to provide effective load sharing, within a predetermined preload range, without the use of shims or similar devices. Very high running accuracy Very high load carrying capacity Relatively high speed and stiffness Universally matchable
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Product Introduction

Dimensions - 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 - 7048 CDGA/P4AAbutment dimensions - 7048 CDGA/P4A

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 and stiffness (back-to-back, face-to-face)
Preload class  

A

Preload when unmounted G

1 300 N

Axial stiffness  

234 N/µm

Correction factors for preload calculation
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

Factors for equivalent bearing load calculation
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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