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SKF / Super-precision angular contact ball bearings

SKF 7218 ACD/P4A

Super-precision, high-capacity, single row angular contact ball bearing technical reference with manufacturer-sourced dimensions, characteristics and engineering resources.

Technical data available
Bore diameterd
90 mm
Outside diameterD
160 mm
WidthB
30 mm
Dynamic load ratingC
121 kN
Static load ratingC0
106 kN
Mass≈m
2.22 kg

Use this page as a technical reference. Verify the current manufacturer specification and the complete application requirements before selection.

Technical data

Product specifications

Metric and imperial values are paired where the manufacturer provides both. Expand a section to review its parameters.

Core specifications11 parameters
Core specifications
ParameterSymbolValue
Variant / constructionSuper-precision angular contact ball bearings
Bore diameterd90 mm
Outside diameterD160 mm
WidthB30 mm
Basic dynamic load ratingC121 kN
Basic static load ratingC0106 kN
Fatigue load limitPu4.05 kN
Mass≈m2.22 kg
SealingWithout
Bearing materialBearing steel
LubricantNone
Dimensions4 parameters
Dimensions
ParameterSymbolValue
Bore diameter90.0 mm
Outside diameter160.0 mm
Width30.0 mm
Contact angle25.0 °
Product identity5 parameters
Product identity
ParameterSymbolValue
Official product categorySuper-precision angular contact ball bearings
Official taxonomy path/products/super-precision-bearings/angular-contact-ball-bearings
Structure group IDBA1_010
Available from SKFYes
RemanufacturableNo
Engineering — Abutment dimensions7 parameters
Engineering — Abutment dimensions
ParameterSymbolValue
Diameter of shaft abutmentd amin. 101 mm
Diameter of shaft abutmentd bmin. 101 mm
Diameter of housing abutmentD amax. 149 mm
Diameter of housing abutmentD bmax. 154.4 mm
Radius of filletr amax. 2 mm
Radius of filletr bmax. 1 mm
Position of oil nozzled n117.5 mm
Engineering — Calculation data10 parameters
Engineering — Calculation data
ParameterSymbolValue
Basic dynamic load ratingC121 kN
Basic static load ratingC 0106 kN
Fatigue load limitP u4.05 kN
Attainable speed for grease lubrication7500 r/min
Attainable speed for oil-air lubrication12000 r/min
Contact angleα25 °
Ball diameterD w22.225 mm
Number of rowsi1
Number of balls (per bearing)z16
Reference grease quantity (per bearing)G ref27.8 cm³
Engineering — Calculation data — Correction factors for preload calculation7 parameters
Engineering — Calculation data — Correction factors for preload calculation
ParameterSymbolValue
Correction factor dependent on bearing series and sizef1.1
Correction factor dependent on contact anglef 10.99
Correction factor, preload class Af 2A1
Correction factor, preload class Bf 2B1
Correction factor, preload class Cf 2C1
Correction factor, preload class Df 2D1.1
Correction factor for hybrid bearingsf HC1
Engineering — Calculation data — Factors for equivalent bearing load calculation8 parameters
Engineering — Calculation data — Factors for equivalent bearing load calculation
ParameterSymbolValue
Limiting valuee0.68
Axial load factor (single, tandem)Y 20.87
Axial load factor (single, tandem)Y 00.38
Radial load factor (single, tandem)X 20.41
Axial load factor (back-to-back, face-to-face)Y 10.92
Axial load factor (back-to-back, face-to-face)Y 21.4
Axial load factor (back-to-back, face-to-face)Y 00.76
Radial load factor (back-to-back, face-to-face)X 20.67
Engineering — Calculation data — Preload and stiffness (back-to-back, face-to-face)8 parameters
Engineering — Calculation data — Preload and stiffness (back-to-back, face-to-face)
ParameterSymbolValue
Preload, class AG A750 N
Axial stiffnes for preload A (sets of two brgs back to back or face to face)273 N/µm
Preload, class BG B1500 N
Axial stiffness for preload B (sets of two brgs back-to-back or face-to-face)355 N/µm
Preload, class CG C3000 N
Axial stiffness for preload C (sets of two brgs back-to-back or face-to-face)469 N/µm
Preload, class DG D6000 N
Axial stiffness for preload D (sets of two brgs back-to-back or face-to-face)632 N/µm
Engineering — Dimensions9 parameters
Engineering — Dimensions
ParameterSymbolValue
Bore diameterd90 mm
Outside diameterD160 mm
WidthB30 mm
Shoulder diameter of inner ring (large side face)d 1111.6 mm
Shoulder diameter of inner ring (small side face)d 2111.6 mm
Shoulder diameter of outer ring (large side face)D 1138.4 mm
Chamfer dimensionr 1,2min. 2 mm
Chamfer dimensionr 3,4min. 1 mm
Distance from side face to pressure pointa44.3 mm
Engineering — Engineering specifications1 parameter
Engineering — Engineering specifications
ParameterSymbolValue
Universal matching bearing(s)No
Logistics3 parameters
Logistics
ParameterSymbolValue
Product net weight2.22 kg
eClass code23-05-08-04
UNSPSC code31171531
Performance4 parameters
Performance
ParameterSymbolValue
Basic dynamic load rating121.0 kN
Basic static load rating106.0 kN
Attainable speed for grease lubrication7500.0 r/min
Attainable speed for oil-air lubrication12000.0 r/min
Properties13 parameters
Properties
ParameterSymbolValue
Contact typeNormal contact (two-point contact)
Number of rows1
Ring typeOne-piece inner and outer rings
DesignHigh-capacity D
Universal matching bearingNo
Matched arrangementNo
Matched condition (axial clearance/ preload)Not applicable
Tolerance classP4A
Material, bearingBearing steel
CoatingWithout
SealingWithout
LubricantNone
Indicative carbon footprint for new product8.2 kg CO 2 e

Technical documents & data sheet

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Record identity
SKF 7218 ACD/P4A
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