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SKF - Rolling Bearings

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Bearing data<br />

Bearing data<br />

Deep groove ball bearings<br />

Cylindrical roller bearings<br />

Dimension<br />

standards<br />

Tolerances<br />

Boundary dimensions: ISO 15<br />

Normal<br />

Higher accuracy (up to P5) for<br />

some bearings on request<br />

Normal<br />

For additional<br />

information<br />

(† page 132)<br />

Values: ISO 492 († tables 3 to 5, pages 137 to 139)<br />

The aluminium-oxide layer on the external surfaces of either the inner or<br />

the outer ring does not affect accuracy.<br />

Internal<br />

clearance<br />

C3<br />

C3<br />

Check availability of other clearance<br />

classes<br />

For additional<br />

information<br />

(† page 149)<br />

Values: ISO 5753-1 († table 6,<br />

page 314)<br />

Values: ISO 5753-1 († table 3,<br />

page 590)<br />

Values are valid for unmounted bearings under zero measuring load.<br />

Misalignment<br />

Identical to standard bearings<br />

(† page 312)<br />

Identical to standard bearings<br />

(† page 585)<br />

Friction,<br />

starting torque,<br />

power loss<br />

Frictional moment, starting torque and power loss can be calculated as<br />

specified under Friction († page 97), or using the tools available online<br />

at skf.com/bearingcalculator.<br />

Defect<br />

frequencies<br />

Electrical<br />

properties<br />

Defect frequencies can be calculated using the tools available online at<br />

skf.com/bearingcalculator.<br />

The standard INSOCOAT layer provides protection against AC and DC<br />

currents. The minimum ohmic resistance is 50 MW at 1 000 V DC.<br />

Tests at <strong>SKF</strong> have shown that electrical breakdown of the insulating<br />

layer occurs above 3 000 V DC.<br />

15E<br />

1209

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