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SKF / Super-precision cylindrical roller bearings

SKF NNU 4992 BK/SPW33

Super-precision double row cylindrical roller bearing with tapered bore and lubrication feature technical reference with manufacturer-sourced dimensions, characteristics and engineering resources.

Technical data available
Bore diameterd
460 mm
Outside diameterD
620 mm
WidthB
160 mm
Dynamic load ratingC
2090 kN
Static load ratingC0
5500 kN
Mass≈m
136 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 specifications12 parameters
Core specifications
ParameterSymbolValue
Variant / constructionSuper-precision cylindrical roller bearings
Bore diameterd460 mm
Outside diameterD620 mm
WidthB160 mm
Basic dynamic load ratingC2090 kN
Basic static load ratingC05500 kN
Fatigue load limitPu465 kN
Mass≈m136 kg
Internal clearanceC1
SealingWithout
Bearing materialBearing steel
LubricantNone
Dimensions3 parameters
Dimensions
ParameterSymbolValue
Bore diameter460.0 mm
Outside diameter620.0 mm
Width160.0 mm
Product identity5 parameters
Product identity
ParameterSymbolValue
Official product categorySuper-precision cylindrical roller bearings
Official taxonomy path/products/super-precision-bearings/cylindrical-roller-bearings
Structure group IDBC2_010
Available from SKFYes
RemanufacturableNo
Engineering — Abutment dimensions4 parameters
Engineering — Abutment dimensions
ParameterSymbolValue
Abutment diameter shaftd amin. 475 mm
Abutment diameter shaft (NNU design)d amax. 504 mm
Abutment diameter housingD amax. 605 mm
Fillet radiusr amax. 3 mm
Engineering — Calculation data5 parameters
Engineering — Calculation data
ParameterSymbolValue
Basic dynamic load ratingC2090 kN
Basic static load ratingC 05500 kN
Fatigue load limitP u465 kN
Attainable speed for grease lubrication1000 r/min
Attainable speed for oil-air lubrication950 r/min
Engineering — Dimensions10 parameters
Engineering — Dimensions
ParameterSymbolValue
Bore diameterd460 mm
Outside diameterD620 mm
WidthB160 mm
Shoulder diameter outer ring (NNU design)D 1567 mm
Raceway diameter inner ring (NNU design)F510 mm
Width annular lubrication groove at outer ringb16.7 mm
Diameter lubrication hole (outer ring)K9 mm
Chamfer dimension outer ringr 1,2min. 4 mm
Chamfer dimension inner ring (bearing with tapered bore)r 3,4min. 2 mm
Permissible axial displacement from the normal position of one bearing ring relative to the other (all)smax. 3.2 mm
Engineering — Engineering specifications1 parameter
Engineering — Engineering specifications
ParameterSymbolValue
Bore typeTapered 1:12
Logistics3 parameters
Logistics
ParameterSymbolValue
Product net weight136.0 kg
eClass code23-05-09-01
UNSPSC code31171505
Performance4 parameters
Performance
ParameterSymbolValue
Basic dynamic load rating2090.0 kN
Basic static load rating5500.0 kN
Attainable speed for grease lubrication1000.0 r/min
Attainable speed for oil-air lubrication950.0 r/min
Properties15 parameters
Properties
ParameterSymbolValue
Bearing partComplete bearing
Number of rows2
Bore typeTapered 1:12
DesignNNU
Number of flanges, outer ring3
Number of flanges, inner ring0
Loose flangeNone
Radial internal clearanceC1
Tolerance classClass SP (SP)
Material, bearingBearing steel
CoatingWithout
SealingWithout
LubricantNone
Relubrication featureAnnular groove and lubrication holes
Indicative carbon footprint for new product503.0 kg CO 2 e

Technical documents & data sheet

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Record identity
SKF NNU 4992 BK/SPW33
Document matching
Exact designation, assembly scope, revision and units must agree.

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