B71960-C-T-P4S-UL Bearing

 

Main Dimensions & Performance Data

d	300 mm	Bore diameter
D	420 mm	Outside diameter
B	56 mm	Width
Cr	370,000 N	Basic dynamic load rating, radial
C0r	405,000 N	Basic static load rating, radial
Cur	22,500 N	Fatigue load limit, radial
nG Grease	3,000 1/min	Limiting speed for grease lubrication
nG Oil	4,500 1/min	Limiting speed for oil lubrication
≈m	19.7 kg	Weight

Mounting dimensions

da	322 mm	Diameter shaft shoulder
da	h12	Diameter shaft shoulder clearance
Da	398 mm	Shoulder diameter outer ring
Da	H12	Shoulder diameter outer ring clearance
ra max	1.5 mm	Maximum recess radius
ra1 max	1 mm	Maximum recess radius
Etk min	337.1 mm	Minimum diameter injection pitch
Etk max	349.7 mm	Maximum diameter injection pitch
Etk1 min	337.1 mm	Minimum diameter injection pitch
Etk1 max	349.7 mm	Maximum diameter injection pitch
a	76.2 mm	Distance between the apexes of the pressure cones

Dimensions

rmin	3 mm	Minimum chamfer dimension
r1 min	1.1 mm	Minimum chamfer dimension
α	15 °	Contact angle

Temperature range

Tmin	-30 °C	Operating temperature min.
Tmax	100 °C	Operating temperature max.

Additional information

FV L	2,084 N	Preload force light
FV M	6,676 N	Preload force medium
FV H	13,480 N	Preload force heavy
KaE L	6,297 N	Lift-off force light
KaE M	21,485 N	Lift-off force medium
KaE H	45,930 N	Lift-off force heavy
ca L	249 N/µm	Axial rigidity light
ca M	409 N/µm	Axial rigidity medium
ca H	574 N/µm	Axial rigidity heavy

The B71960-C-T-P4S-UL is a high-precision angular contact ball bearing specifically designed for high-speed spindle applications. The designation itself provides valuable clues about its characteristics. "B" typically denotes a specific series or design within the manufacturer's product line. "71960" refers to the bearing's boundary dimensions, indicating its size and load capacity. "C" signifies the contact angle, which influences the bearing's axial and radial load carrying capacities and stiffness. "T" usually indicates a specific cage design, often optimized for high-speed operation and reduced friction. "P4S" is a precision class designation according to ISO standards, indicating extremely tight tolerances and high running accuracy, with "S" possibly denoting special internal clearance or other specific features. "UL" often signifies universal matching, meaning these bearings can be used in sets with defined preload.

This bearing boasts several key features that contribute to its high performance. The high precision manufacturing processes result in exceptional running accuracy and minimal runout, crucial for achieving precise machining results. The optimized internal design, including the contact angle and ball complement, is engineered for high stiffness and load capacity while minimizing heat generation at high speeds. The cage material and design are selected to reduce friction and wear, contributing to extended bearing life. The "UL" designation allows for versatile mounting arrangements, enabling precise preload settings when used in sets, enhancing spindle rigidity and performance.

The B71960-C-T-P4S-UL finds primary application in machine tool spindles, particularly in high-speed milling, grinding, and turning centers. Its ability to operate at extremely high speeds with minimal vibration and high accuracy makes it ideal for applications demanding tight tolerances and superior surface finishes. It is also employed in other high-speed rotating equipment such as woodworking machinery, high-speed test rigs, and precision measuring instruments. By minimizing vibration and maximizing stiffness, these bearings contribute to improved machining accuracy, increased productivity due to higher cutting speeds, and reduced downtime due to extended bearing life.

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