B7008-C-T-P4S-UL Bearing

 

d	40 mm	Bore diameter
D	68 mm	Outside diameter
B	15 mm	Width
Cr	20,900 N	Basic dynamic load rating, radial
C0r	11,200 N	Basic static load rating, radial
Cur	1,180 N	Fatigue load limit, radial
nG Grease	22,000 1/min	Limiting speed for grease lubrication
nG Oil	34,000 1/min	Limiting speed for oil lubrication
≈m	188.97 g	Weight

da	46 mm	Diameter shaft shoulder
da	h12	Diameter shaft shoulder clearance
Da	62 mm	Shoulder diameter outer ring
Da	H12	Shoulder diameter outer ring clearance
ra max	1 mm	Maximum recess radius
ra1 max	0.3 mm	Maximum recess radius
Etk min	49.3 mm	Minimum diameter injection pitch
Etk max	51.8 mm	Maximum diameter injection pitch
Etk1 min	49.3 mm	Minimum diameter injection pitch
Etk1 max	51.8 mm	Maximum diameter injection pitch
a	14.7 mm	Distance between the apexes of the pressure cones

rmin	1 mm	Minimum chamfer dimension
r1 min	1 mm	Minimum chamfer dimension
α	15 °	Contact angle

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

FV L	101 N	Preload force light
FV M	344 N	Preload force medium
FV H	698 N	Preload force heavy
KaE L	312 N	Lift-off force light
KaE M	1,157 N	Lift-off force medium
KaE H	2,515 N	Lift-off force heavy
ca L	43 N/µm	Axial rigidity light
ca M	76 N/µm	Axial rigidity medium
ca H	109 N/µm	Axial rigidity heavy

 

B7008: This indicates the bearing's size and series. The "70" series signifies a specific dimensional series, and "08" relates to the bore diameter (often, but not always, related to millimeters).
C: This denotes the contact angle. A "C" typically represents a 15-degree contact angle. This angle influences the bearing's axial and radial load capacities and its stiffness. A smaller angle prioritizes higher speed capability and lower axial load capacity, while a larger angle does the opposite.
T: This signifies the cage material. "T" usually represents a phenolic resin or synthetic resin cage. These cages are chosen for their lightweight properties, high speed capabilities, and good lubrication characteristics.
P4S: This is a crucial part of the designation, indicating the bearing's precision class. "P4" is an ISO (International Organization for Standardization) tolerance class indicating high precision, tighter tolerances than standard bearings. The "S" often denotes further internal clearance or preload specifications within the P4 class, often optimized for spindle applications.
UL: This usually refers to a specific preload or light preload. Preload is the internal axial force applied to the bearing during assembly. It significantly affects the bearing's stiffness, running accuracy, and operating temperature. "UL" typically suggests a light preload, suitable for very high-speed applications where minimizing heat generation is critical.
Key Characteristics and Applications:
High Speed Capability: The combination of a smaller contact angle (C), phenolic cage (T), and light preload (UL) facilitates very high rotational speeds.
High Rigidity: The angular contact design and precise manufacturing (P4S) provide excellent radial and axial stiffness, crucial for maintaining machining accuracy.
Low Noise and Vibration: Precision manufacturing and optimized internal design contribute to smooth and quiet operation.
Precise Positioning: The high accuracy of P4S class bearings allows for precise positioning and machining tolerances.
These bearings are commonly found in:

Machine Tool Spindles: Milling machines, lathes, grinding machines, etc.
High-Speed Routers: In woodworking and other material processing.
Precision Measuring Equipment: Where accuracy is essential.

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