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SKF / Spherical roller bearings

SKF 21308 EKW

Spherical roller bearing with tapered bore technical reference with manufacturer-sourced dimensions, characteristics and engineering resources.

Technical data available
Bore diameterd
40 mm
Outside diameterD
90 mm
WidthB
23 mm
Dynamic load ratingC
107 kN
Static load ratingC0
108 kN
Limiting speednG
9500 r/min

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 specifications15 parameters
Core specifications
ParameterSymbolValue
Variant / constructionSpherical roller bearings
Bore diameterd40 mm
Outside diameterD90 mm
WidthB23 mm
Basic dynamic load ratingC107 kN
Basic static load ratingC0108 kN
Fatigue load limitPu12 kN
Reference speednref7000 r/min
Limiting speednG9500 r/min
Mass≈m0.738 kg
Precision classNormal
Internal clearanceCN
SealingWithout
CageSheet metal
LubricantNone
Dimensions3 parameters
Dimensions
ParameterSymbolValue
Bore diameter40.0 mm
Outside diameter90.0 mm
Width23.0 mm
Product identity5 parameters
Product identity
ParameterSymbolValue
Official product categorySpherical roller bearings
Official taxonomy path/products/rolling-bearings/roller-bearings/spherical-roller-bearings
Structure group IDBS2_001
Available from SKFYes
RemanufacturableNo
Engineering — Abutment dimensions2 parameters
Engineering — Abutment dimensions
ParameterSymbolValue
Diameter of housing abutmentD amax. 81 mm
Radius of filletr amax. 1.5 mm
Engineering — Calculation data10 parameters
Engineering — Calculation data
ParameterSymbolValue
SKF performance classSKF Explorer
Basic dynamic load ratingC107 kN
Basic static load ratingC 0108 kN
Fatigue load limitP u12 kN
Reference speed7000 r/min
Limiting speed9500 r/min
Limiting valuee0.24
Calculation factorY 12.8
Calculation factorY 24.2
Calculation factorY 02.8
Engineering — Dimensions11 parameters
Engineering — Dimensions
ParameterSymbolValue
Bore diameterd40 mm
Deviation limits of mid-range bore diametert Δdmp0 to 0.025 mm
Deviation limits of tapered slopet ΔSL0 to 0.025 mm
Outside diameterD90 mm
Deviation limits of mid-range outside diametert ΔDmp-0.015 to 0 mm
WidthB23 mm
Deviation limits of ring widtht ΔBs-0.06 to 0 mm
Shoulder diameter of inner ringd 2≈ 60 mm
Shoulder/recess diameter of outer ringD 1≈ 79.8 mm
Chamfer dimensionr 1,2min. 1.5 mm
ISO tolerance class for dimensionsNormal
Engineering — Engineering specifications1 parameter
Engineering — Engineering specifications
ParameterSymbolValue
Bore typeTapered 1:12
Engineering — Radial internal clearance2 parameters
Engineering — Radial internal clearance
ParameterSymbolValue
Minimum initial clearance35 µm
Maximum initial clearance50 µm
Engineering — Tolerances of run-out5 parameters
Engineering — Tolerances of run-out
ParameterSymbolValue
Range of section height at inner ring of assembled bearingt Kia5 µm
Maximum run-out of inner ring side face to the boret Sd8 µm
Range of section height at outer ring of assembled bearingt Kea10 µm
Perpendicularity of outer ring outside surfacet SD4.5 µm
ISO tolerance class for geometrical tolerancesP5
Logistics3 parameters
Logistics
ParameterSymbolValue
Product net weight0.738 kg
eClass code23-05-09-11
UNSPSC code31171510
Performance5 parameters
Performance
ParameterSymbolValue
Basic dynamic load rating107.0 kN
Basic static load rating108.0 kN
Reference speed7000.0 r/min
Limiting speed9500.0 r/min
SKF performance classSKF Explorer
Properties11 parameters
Properties
ParameterSymbolValue
Number of rows2
Locating feature, bearing outer ringWithout
Bore typeTapered 1:12
CageSheet metal
Radial internal clearanceCN
Tolerance class for dimensionsNormal
Tolerance class for run-outP5
SealingWithout
LubricantNone
Relubrication featureWithout
Indicative carbon footprint for new product2.7 kg CO 2 e

Technical documents & data sheet

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Record identity
SKF 21308 EKW
Document matching
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